bcax-20241231

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________

FORM 10-K

___________________________

(Mark One)

For the fiscal year ended December 31, 2024

For the transition period from ___________ to ___________

Commission file number 001-42271

_________________________

Bicara Therapeutics Inc.

(Exact name of registrant as specified in its charter)

_________________________

(Address of Principal Executive Offices) (Zip Code)

(617)468-4219

Registrant’s telephone number, including area code

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Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Common Stock, par value $0.0001 BCAX Nasdaq Global Market

Securities registered pursuant to section 12(g) of the Act: None.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes o Nox

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

Yes o Nox

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yesx No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yesx No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company, ”and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☐ Accelerated filer ☐

Non-accelerated filer x Smaller reporting company x

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.

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If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).

Yes oNo x

As of June 30, 2024, the last business day of the registrant’s most recently completed second quarter, there was no established public trading market for the registrant’s equity securities as the registrant was not a public company and therefore cannot calculate the aggregate market value of its voting and non-voting equity held by non-affiliates as of such date. The registrant’s common stock began trading on the Nasdaq Global Market on September 13, 2024.

As of March 24, 2025, the registrant had 54,523,326 shares of common stock, $0.0001 par value per share outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Part III of this Annual Report on Form 10-K incorporates by reference portions of the registrant’s Definitive Proxy Statement for its 2025 Annual Meeting of Shareholders, which the registrant anticipates will be filed with the Securities and Exchange Commission no later than 120 days after the end of its 2024 fiscal year pursuant to Regulation 14A.

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Page

PART I

Item 1. Business 9

Item 1A. Risk Factors 64

Item 1B. Unresolved Staff Comments 123

Item 1C. Cybersecurity 123

Item 2. Properties 124

Item 3. Legal Proceedings 124

Item 4. Mine Safety Disclosures 125

PART II

Item 6. [Reserved] 126

Item 7A. Quantitative and Qualitative Disclosures About Market Risk 140

Item 8. Financial Statements and Supplementary Data 145

Item 9A. Controls and Procedures 141

Item 9B. Other Information 142

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections 143

PART III

Item 10. Directors, Executive Officers and Corporate Governance 144

Item 11. Executive Compensation 144

Item 14. Principal Accountant Fees and Services 144

PART IV

Item 15. Exhibit and Financial Statement Schedules 144

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SUMMARY OF THE MATERIAL RISKS ASSOCIATED WITH OUR BUSINESS

We are subject to numerous risks and uncertainties, including those further described below in the section entitled “Risk Factors” in this Annual Report on Form 10-K, that represent challenges that we face in connection with the successful implementation of our strategy and the growth of our business. In particular, the following considerations, among others, may offset our competitive strengths or have a negative effect on our business strategy, which could materially adversely affect our business, financial conditions, results of operations, future growth prospects, or cause a decline in the price of our common stock:

•We are a clinical-stage biopharmaceutical company with a limited operating history, which may make it difficult to evaluate our current business and predict our future success and viability. We have incurred significant financial losses since our inception and anticipate that we will continue to incur significant financial losses for the foreseeable future;

•We will require additional funding in order to finance operations beyond 2029. If we are unable to raise capital when needed, or on acceptable terms, we could be forced to delay, reduce or eliminate our product development programs or commercialization efforts.

•Our business is highly dependent on the success of ficerafusp alfa. If we are unable to successfully complete clinical development, obtain regulatory approval for or commercialize ficerafusp alfa, or if we experience delays in doing so, our business will be materially harmed.

•The regulatory approval processes of the U.S. Food and Drug Administration and comparable foreign authorities are lengthy, time-consuming and inherently unpredictable, and if we are ultimately unable to obtain regulatory approval for our product candidates, our business will be materially harmed.

•Clinical development involves a lengthy and expensive process with uncertain outcomes. We may incur additional costs and experience delays in developing and commercializing or be unable to develop or commercialize ficerafusp alfa and any future product candidates.

•Ficerafusp alfa or any future product candidates may cause undesirable side effects or have other properties when used alone or in combination with other approved products or investigational new drugs that could halt their clinical development, delay or prevent their regulatory approval, limit their commercial potential or result in significant negative consequences.

•The commercial success of ficerafusp alfa or any future product candidates will depend upon the degree of market acceptance of such product candidates by physicians, patients, healthcare payors and others in the medical community.

•Our ability to develop product candidates, leverage our potential and our future growth depends on attracting, hiring and retaining our key personnel and recruiting additional qualified personnel. If we are not successful in attracting, motivating and retaining highly qualified personnel, we may not be able to successfully implement our business strategy. Additionally, we will need to grow the size of our organization, and we may experience difficulties in managing this growth.

•We rely, and expect to continue to rely, on third parties, including independent clinical investigators and contract research organizations to conduct our preclinical studies and clinical trials. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may not be able to obtain regulatory approval for or commercialize our product candidates and our business could be substantially harmed.

•We currently and in the future may depend on other third-party collaborators for the discovery, development and commercialization of ficerafusp alfa and any of our future product candidates. If our collaborations are not successful, we may not be able to capitalize on the market potential of these product candidates.

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•We have not yet demonstrated an ability to generate revenue, obtain regulatory approval, manufacture any product on a commercial scale or arrange for a third party to do so on our behalf or conduct sales and marketing activities necessary for successful product commercialization.

The summary risk factors described above should be read together with the text of the full risk factors in the section titled “Risk Factors” and the other information set forth in this Annual Report, including our audited consolidated financial statements and the related notes, as well as in other documents that we file with the SEC. The risks summarized above or described in full elsewhere in this Annual Report are not the only risks that we face. Additional risks and uncertainties not presently known to us, or that we currently deem to be immaterial may also materially adversely affect our business, financial condition, results of operations and future growth prospects.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains express or implied forward-looking statements that are based on our management’s belief and assumptions and on information currently available to our management. Although we believe that the expectations reflected in these forward-looking statements are reasonable, these statements relate to future events or our future operational or financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Forward-looking statements in this Form 10-K include, but are not limited to, statements about:

•the initiation timing, progress, results and cost of ficerafusp alfa, including the FORTIFI-HN01 pivotal Phase 2/3 (“FORTIFI-HN01 Phase 2/3 trial” or “FORTIFI-HN01”), a trial in head and neck squamous cell carcinoma, or HNSCC, and the potential expansion Phase 1/1b trial in additional HNSCC patient populations, as well as our research and development programs and our current and future preclinical and clinical studies;

•the ability and the potential to secure pembrolizumab for our clinical trials and successfully manufacture our drug substances and ficerafusp alfa for preclinical use, for clinical trials and on a larger scale for commercial use, if approved;

•the ability of clinical trials to demonstrate safety and efficacy of ficerafusp alfa, and other positive results;

•the beneficial characteristics, and the potential safety, efficacy and therapeutic effects of ficerafusp alfa;

•the timing, scope and likelihood of regulatory filings and approvals, for ficerafusp alfa and future product candidates, including the timing of Investigational New Drug applications, or INDs, and final U.S. Food and Drug Administration, or FDA approval of ficerafusp alfa or any future product candidate;

•the timing, scope or likelihood of foreign regulatory filings and approvals;

•our estimates of the number of patients that we will enroll and our ability to initiate, recruit and enroll patients in and conduct and successfully complete our clinical trials at the pace that we project;

•our ability to maintain and further develop the specific shipping, storage, handling and administration of ficerafusp alfa at the clinical sites;

•the ability and willingness of our third-party strategic collaborators to continue research and development activities relating to our development candidates and ficerafusp alfa;

•our ability to obtain funding for our operations necessary to complete further development and commercialization of ficerafusp alfa;

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•our ability to obtain and maintain regulatory approval of ficerafusp alfa;

•our ability to commercialize ficerafusp alfa, if approved;

•the pricing and reimbursement of ficerafusp alfa, if approved;

•the implementation of our business model, and strategic plans for our business, ficerafusp alfa and technology;

•the scope of protection we are able to establish and maintain for intellectual property rights covering ficerafusp alfa and other product candidate we may develop, including the extensions of existing patent terms where available, the validity of intellectual property rights held by third parties and our ability not to infringe, misappropriate or otherwise violate any third-party intellectual property rights;

•estimates of our future expenses, revenues and capital requirements and our needs for additional financing;

•future agreements with third parties in connection with the development and commercialization of ficerafusp alfa and any other approved product;

•the size and growth potential of the markets for ficerafusp alfa and our ability to serve those markets;

•our financial performance;

•the rate and degree of market acceptance of ficerafusp alfa;

•regulatory developments in the U.S., Canada, European Union and other foreign countries;

•our ability to contract with third-party suppliers and manufacturers and their ability to perform adequately;

•our ability to produce our products or ficerafusp alfa with advantages in turnaround times or manufacturing cost;

•the success of competing therapies that are or may become available;

•our ability to attract and retain key scientific or management personnel;

•the impact of laws and regulations;

•developments relating to our competitors and our industry; and

•other risks and uncertainties, including those listed under the caption “Risk Factors.”

In some cases, forward-looking statements can be identified by terminology such as “may,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” or the negative of these terms or other comparable terminology. These statements are only predictions. You should not place undue reliance on forward-looking statements because they involve known and unknown risks, uncertainties and other factors, which are, in some cases, beyond our control and which could materially affect results. Factors that may cause actual results to differ materially from current expectations include, among other things, those listed under the section titled “Risk Factors” and elsewhere in this Form 10-K. If one or more of these risks or uncertainties occur, or if our underlying assumptions prove to be incorrect, actual events or results may vary significantly from those implied or projected by the forward-looking statements. No forward-looking statement is a guarantee of future performance. You should read this Form 10-K and the documents that we reference in this Form 10-K and have filed with the Securities and Exchange Commission, or SEC, as exhibits hereto completely and with the understanding

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that our actual future results may be materially different from any future results expressed or implied by these forward-looking statements.

The forward-looking statements in this Form 10-K represent our views as of the date of this Form 10-K. We anticipate that subsequent events and developments will cause our views to change. However, while we may elect to update these forward-looking statements at some point in the future, we have no current intention of doing so except to the extent required by applicable law. You should therefore not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Form 10-K.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this Form 10-K, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and you are cautioned not to unduly rely upon these statements.

This Annual Report on Form 10-K also contains estimates, projections and other information concerning our industry, our business and the markets for our product candidates. Information that is based on estimates, forecasts, projections, market research or similar methodologies is inherently subject to uncertainties and actual events or circumstances may differ materially from events and circumstances that are assumed in this information. Unless otherwise expressly stated, we obtained this industry, business, market, and other data from our own internal estimates and research as well as from reports, research surveys, studies, and similar data prepared by market research firms and other third parties, industry, medical and general publications, government data and similar sources. While we are not aware of any misstatements regarding any third-party information presented in this Annual Report on Form 10-K, their estimates, in particular as they relate to projections, involve numerous assumptions, are subject to risks and uncertainties and are subject to change based on various factors, including those discussed under the section titled “Risk Factors” and elsewhere in this Annual Report on Form 10-K.

NOTE REGARDING TRADEMARKS

Bicara Therapeutics, Inc. is the owner of the Bicara trademark, as well as certain other trademarks, including design versions of some of these trademarks. The symbols TM and ® are not used in connection with the presentation of these trademarks in this report and their absence does not indicate a lack of trademark rights. Certain other trademarks used in this report are the property of third-party trademark owners and may be presented with or without trademark references.

All brand names or trademarks appearing in this report are the property of their respective owners. Unless the context requires otherwise, references in this report to “Bicara,” the “Company,” “we,” “us” and “our” refer to Bicara Therapeutics, Inc. and its subsidiary.

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Part I

Item 1. Business

Overview

We are a clinical-stage biopharmaceutical company committed to bringing transformative bifunctional therapies to patients with solid tumors. We have built a platform designed to facilitate the development of bifunctional therapies that precisely target the tumor and deliver a tumor-modulating payload to the tumor site. This dual-targeting approach both enhances drug exposure within the tumor microenvironment, or TME, and limits systemic toxicity. This approach was deployed in the development of our lead program ficerafusp alfa, formerly BCA101, where we believe the bifunctional design can potentially improve upon the therapeutic profile of immunotherapies and targeted therapies by addressing resistance mechanisms and limiting off-target toxicity, therefore, enhancing the treatment effect and tolerability for targeted patient populations with cancer.

Our lead program ficerafusp alfa is a bifunctional antibody that combines two clinically validated targets, an epidermal growth factor receptor, or EGFR, directed monoclonal antibody with a domain that binds to human transforming growth factor beta, or TGF-β. Through this dual-targeting mechanism, ficerafusp alfa has the potential to exert potent anti-tumor activity by simultaneously blocking both cancer cell-intrinsic EGFR survival and proliferation, as well as the immunosuppressive TGF-β signaling within the TME. Ficerafusp alfa directs the TGF-β inhibitor into the immediate TME through the binding of EGFR on tumor cells, which we believe will lead to durable responses and an increase in overall survival, or OS, while reducing the adverse effects typically associated with systemic TGF-β inhibition. Ficerafusp alfa is initially being developed in head and neck squamous cell carcinoma, or HNSCC, where there remains a significant unmet need. In June 2023, in an oral presentation at an American Society of Clinical Oncology meeting, we first presented data from our Phase 1/1b dose expansion cohort evaluating ficerafusp alfa in combination with pembrolizumab in first-line recurrent/metastatic, or R/M, HNSCC patients with a CPS greater than or equal to one which demonstrated meaningful response rates, progression-free survival, and was generally well-tolerated.

Based on the preliminary clinical data generated to date, we believe that ficerafusp alfa in combination with pembrolizumab has the potential to become a first-line standard of care therapy in R/M HNSCC. In February 2025, we enrolled the first patients in FORTIFI-HN01, a pivotal Phase 2/3 trial (“FORTIFI-HN01 Phase 2/3 trial” or “FORTIFI-HN01”) of ficerafusp alfa in combination with pembrolizumab as a first-line therapy in R/M HNSCC excluding patients with oropharyngeal squamous cell carcinoma, or OPSCC, associated with human papillomavirus infection, or HPV-positive OPSCC patients.

We believe ficerafusp alfa also has the potential to provide meaningful clinical benefit in other solid tumors where there is a strong biologic rationale for the dual inhibition of both EGFR and TGF-β, such as colorectal cancer or CRC, and other squamous cell carcinomas which typically overexpress EGFR and TGF-β pathways such as cutaneous squamous cell carcinoma, or CSCC, and squamous cell carcinoma of the anal canal, or SCAC. We have demonstrated preliminary activity of ficerafusp alfa in combination with pembrolizumab or as a monotherapy in both CSCC and SCAC within our Phase 1/1b dose expansion cohorts conducted in the U.S. and Canada.

Ficerafusp alfa: a bifunctional EGFR-directed antibody x TGF-β trap

EGFR is the primary member of a larger family of cell-surface growth factor receptors harboring intrinsic tyrosine kinase function. EGFR is involved in many tumor-promoting pathways. Its overexpression has been linked to multiple squamous cell cancers, including HNSCC, where EGFR expression has been shown to be greater than 90%. EGFR has been a long-standing focus for cancer drug development due to the correlation between EGFR expression, poor prognosis and resistance to therapy. Cetuximab is an EGFR-directed monoclonal antibody approved for HNSCC and colorectal cancer that drives anti-tumor responses by inhibiting EGFR signaling and through antibody-dependent cell-mediated cytotoxicity, or ADCC. However, acquired resistance mechanisms to cetuximab can prevent durable responses. We believe that there is a significant market opportunity for EGFR targeted therapies with improved efficacy, durability and OS compared to cetuximab.

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TGF-β is a cytokine that controls a range of biological functions and is widely understood to play a critical role in cancer. TGF-β perpetuates tumor survival by promoting tumor cell proliferation, migration, invasion and metastasis. TGF-β also serves as an immunosuppressant, inhibiting both natural killer, or NK, cells and cytotoxic T cells. The inhibition of TGF-β has been demonstrated to improve anti-tumor responses in vivo. However, these findings have not been translated into substantial improvements in clinical efficacy, which we believe may be due to the inability to sufficiently inhibit TGF-β directly within the TME. Increased TGF-β expression within the TME contributes to an immune-excluded environment that can hinder an effective immune response to tumor formation and growth.

Ficerafusp alfa is a bifunctional antibody that combines the well-established biologies of both the clinically validated anti-EGFR antibody cetuximab and a TGF-β binding domain to deliver a potent anti-tumor therapy, sequestering TGF-β directly to EGFR-expressing tumors with the goal of limiting off-target toxicity. We have shown both in vitro and in vivo that ficerafusp alfa performs as expected, by binding to both targets, localizing to the tumor, inhibiting tumor growth and suppressing TGF-β levels within tumors.

Our initial focus with ficerafusp alfa: R/M HNSCC

HNSCC is one of the most common cancers in the U.S. and globally with a rising incidence anticipated to reach one million new global cases annually by 2030. There are approximately 67,000 cases of HNSCC each year in the U.S with a 13% 5-year survival rate. Ten percent of HNSCC patients are diagnosed with metastatic disease and up to 30% develop a recurrence or metastases over time after initial treatment for advanced HNSCC. There are approximately 23,000 cases of R/M HNSCC each year in the U.S. Median OS for patients with R/M HNSCC is only 12 months. Most cases of HNSCC are believed to arise from mutations that accumulate due to carcinogenic exposure, such as tobacco smoke, or by HPV. Approximately 80% of patients with R/M HNSCC are not associated with HPV infection or HPV-negative, a status associated with a worse prognosis. Pembrolizumab with or without chemotherapy is the standard of care for R/M HNSCC patients who have evidence of PD-L1 expressing tumors is pembrolizumab monotherapy. The KEYNOTE-048 Phase 3 trial of pembrolizumab conducted by Merck & Co. Inc., or Merck & Co, demonstrated an ORR of 19% to pembrolizumab monotherapy with a median progression-free survival, or mPFS of 3.2 months in a population of HPV-negative and HPV-positive patients with CPS greater than or equal to one. For patients with a CPS less than one and no PD-L1 expression within their TME, the typical standard of care is a combination of cetuximab and chemotherapy, referred to as the EXTREME regimen, which has low response rates and survival, as well as a difficult tolerability profile.

We believe the poor prognoses in HPV-negative R/M HNSCC and the low ORR associated with available therapies may be attributed to the elevated levels of TGF-β observed in these patients. It has been shown in translational studies that EGFR inhibition leads to further increases in TGF-β levels which result in the development of resistance to EGFR-targeted therapeutics. We believe blocking TGF-β has the potential to prevent resistance and improve the anti-tumor activity of anti-EGFR therapies, leading to more durable responses and an increase in OS. Similarly, inhibiting TGF-β may reduce the fibrosis and immune-exclusion within the TME that could be responsible for the low efficacy seen with checkpoint inhibitors in these immunosuppressive, or “cold” tumors. We believe promoting immune activation via TGF-β blockade may translate to significant increases in anti-tumor efficacy, particularly in the depth and durability of responses in combination with anti-PD1 therapies.

We are working to bring ficerafusp alfa, a potentially transformative therapy, to patients as quickly as possible. In February, 2025 we enrolled the first patients in FORTIFI-HN01, a double-blind, placebo-controlled Phase 2/3 trial in R/M HNSCC patients, excluding patients with HPV-positive OPSCC, which we believe is sufficiently powered to achieve results that may lead to accelerated approval. This trial will enroll approximately 650 patients with a PD-L1 CPS greater than or equal to one, and who have not received systemic therapy in the R/M setting. We intend to conduct an interim analysis to determine if the ORR within 6 months of follow-up on durability is sufficient to seek accelerated approval and will continue the trial with the goal of demonstrating a statistically significant improvement in OS. We anticipate that the ORR interim analysis may occur in 2027.

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We believe our competitive strengths will allow us to successfully develop, commercialize and maximize the impact of ficerafusp alfa:

•Validated dual-targeting mechanism of action with potential to exert potent and durable anti-tumor activity.

Ficerafusp alfa is a bifunctional antibody designed to simultaneously block both cancer cell-intrinsic EGFR survival and proliferation, as well as the well-understood immunosuppressive TGF-β signaling within the TME. Ficerafusp alfa leverages the established biology of the clinically validated anti-EGFR antibody cetuximab. However, ficerafusp alfa is differentiated from existing therapies through the targeting of TGF-β, which localizes the ligand to EGFR expressing tumor cells, potentially increasing its activity at the tumor site and limiting systemic toxicity. Importantly, TGF-β inhibition synergizes with EGFR, which we believe will prevent resistance to treatment and lead to more durable responses.

•Clinical data generated to date representing meaningful improvements over standard of care.

We have generated compelling interim clinical data for ficerafusp alfa in a Phase 1/1b trial of R/M HNSCC patients. In this trial, treatment with ficerafusp alfa in combination with pembrolizumab led to a 64% ORR (18/28) in HPV-negative patients. The combination also demonstrated an 18% (5/28) CR rate and mPFS of 9.8 months in the same patient population. As of April 2024, with at least 12 months of follow-up, median OS and mDOR had not yet been reached, and we expect to announce updated interim Phase 1/1b data at a future medical meeting in the first half of 2025. We believe that ficerafusp alfa in combination with pembrolizumab has the potential to become a first-line standard of care therapy in HPV-negative R/M HNSCC.

•Potential to address significant unmet need in HPV-negative R/M HNSCC with clear development pathway.

HNSCC is one of the most common cancers, accounting for approximately 4% of all cancers in the U.S. An estimated 80% of R/M HNSCC cases are HPV-negative, a status associated with significantly worse outcomes compared to HPV-positive patients. We are prioritizing our initial development efforts in HPV-negative R/M HNSCC given the significant unmet need for durable therapies in this patient population. We also believe that ficerafusp alfa will be most effective in this patient subset given the (1) high expression of EGFR, (2) elevated levels of TGF-β and (3) current preclinical and clinical data, including from our own Phase 1/1b study, supporting increased activity within HPV-negative patients. We believe our deliberate patient selection strategy provides the best opportunity to demonstrate the potential of ficerafusp alfa as a first-line therapy.

•Potential to expand the clinical development of ficerafusp alfa in additional patient populations within HNSCC and other solid tumors of squamous cell origin.

Beyond our initial development plans, we believe there are significant opportunities to expand the clinical development of ficerafusp alfa to other populations of HNSCC patients with greater than 60,000 cases each year in the U.S., including for the treatment of locally advanced HPV-negative HNSCC and in the neoadjuvant or adjuvant setting. We also believe ficerafusp alfa has the potential to provide meaningful clinical benefit in other EGFR-expressing solid tumors of squamous cell origin, such as colorectal cancer, SCAC, CSCC and other squamous cell carcinomas where there is a strong biologic rationale for the dual-inhibition of EGFR and TGF-β pathways. We plan to explore these additional development opportunities to maximize the potential of ficerafusp alfa for the treatment of cancer.

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The Established Role of EGFR and TGF-β in Squamous Cell Carcinomas and other Solid Tumors

Targeting EGFR in squamous cell carcinomas and other solid tumors

EGFR is a cell-surface tyrosine kinase growth factor receptor that is involved in many tumor-promoting pathways. Activation of EGFR pathways leads to cell cycle progression, reduction in cell death, blood vessel formation and a metastatic phenotype. EGFR overexpression has been linked to several cancers of squamous cell origin, including HNSCC, CSCC, SCAC and colorectal cancer. Several of these cancer types show EGFR expression in tumors to be greater than 50%, with greater than 90% expression in HNSCC. EGFR overexpression in tumors has been shown to correlate with poor prognosis and resistance to therapy. For this reason, the development of therapies targeting EGFR has been a long-standing focus in cancer drug development.

EGFR-directed monoclonal antibodies, such as cetuximab, drive anti-tumor responses both through inhibiting EGFR signaling and through ADCC. ADCC-mediated cell killing occurs when NK cells recognize and bind to antibodies containing an IgG1 Fc domain, which are bound to their respective tumor cell surface antigens. Cetuximab is approved in HNSCC and colorectal cancer, two tumor types where EGFR overexpression is at its highest and has also shown the highest anti-tumor efficacy. The durability of EGFR-targeted therapies has been limited by acquired resistance mechanisms.

Due to its role as a well-validated tumor antigen, EGFR-directed monoclonal antibodies are utilized to deliver anti-tumor payloads directly to the tumor. Currently, there are several EGFR antibody-drug conjugates and bispecific antibodies in development that aim to mitigate the systemic toxicities of chemotherapy-derived drug conjugates by delivering these payloads directly to EGFR-expressing tumors.

The role of TGF-β in cancer progression

TGF-β is a cytokine molecule that functions as a master regulator of immunity and cellular signaling that controls a wide range of biological functions. TGF-β plays multiple essential roles in the body’s early development and survival as well as in maintaining health in mature organisms.

In oncogenesis, or the process by which normal, healthy cells turn into cancerous cells, TGF-β both promotes tumor growth and shields tumors from immune surveillance and removal. TGF-β1 is the most commonly expressed isoform of TGF-β in various human tumor types and is predominantly expressed in cancers of squamous-cell origin, such as HNSCC. Third party studies have demonstrated that TGF-β1 expression and activation likely contribute to immune escape, which is linked to the primary resistance observed in human tumors against certain cancer therapies. As depicted in Figure 1 below, its immunosuppressive functions are accomplished through a variety of tumor survival mechanisms.

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Figure 1. TGF-β promotes tumor survival through multiple mechanisms

TGF-β also serves as a tumor promoter by transforming cells from a more differentiated state to a less differentiated, more primitive state that is no longer dependent on EGFR signaling for proliferation and survival. This shift is known as the epithelial-mesenchymal transition, or EMT, which leads to tumor cell proliferation, migration, invasion and metastasis. Due to its role in cancer progression, we believe the inhibition of TGF-β has the potential to both limit the tumors’ ability to escape EGFR inhibition by switching to an EGFR signaling independent phenotype, as well as restore the immune system’s ability to repress tumor growth.

TGF-β as a known EGFR-therapy resistance mechanism

When EGFR signaling is blocked by targeted therapy, tumors respond by increasing TGF-β expression within the TME. This results in an increase in tumor cell proliferation and a decrease in the tumor’s dependence on EGFR activation, thus making the tumor less sensitive to EGFR inhibition.

In addition to inhibiting direct cell killing by EGFR inhibition, TGF-β protects cells from ADCC both by the activation of survival pathways in tumor cells and through the modulation of the NK cell response. Furthermore, TGF-β both blocks the differentiation of NK cells and reduces NK cell cytotoxicity.

Preclinical studies suggest that targeting TGF-β may lead to improvements in overall efficacy. As depicted in Figure 2 below, experiments published in Molecular Cancer Therapeutics in a squamous cell carcinoma cell line xenograft model demonstrate that simultaneous treatment with EGFR and TGF-β blocking antibodies led to complete tumor regression.

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Figure 2. The combination of an anti-EGFR and an anti-TGF-β antibody led to complete regression of a squamous cell carcinoma cell line xenograft tumors

TGF-β as a known checkpoint inhibitor resistance mechanism

The activities of TGF-β extend to the inhibition of cancer immunotherapies known as checkpoint inhibitors. TGF-β inhibits the activation of T cells by PD-1 checkpoint inhibitors and can lead to resistance to anti-PD-1/PD-L1 therapy by promoting immunosuppression and immune exclusion within the TME.

TGF-β promotes immune tolerance of tumors by inducing differentiation of naïve CD4 T cells into regulatory T cells, or Treg cells. Treg cells are components of the immune system that contribute to the maintenance of immune tolerance. TGF-β can shift the differentiation of naïve CD4 T cells towards Treg cells, thereby leading to immunosuppression. In addition, TGF-β inhibits tumor cell killing by immune cell populations, including CD4 and CD8 T cells and NK cells.

Increased TGF-β expression within the TME contributes to an immune-excluded environment. Specifically, cancer-associated fibroblasts, or CAFs, expressing TGF-β contribute to fibrosis within the TME and result in T-cell exclusion, further limiting the activity of immunotherapy.

As depicted in Figure 3 below, in vivo academic studies in an HNSCC xenograft model demonstrated that the effectiveness of anti-PD-1 checkpoint inhibitors was greatly enhanced when administered in combination with anti-TGF-β therapy. Combining an anti-PD-1 antibody with an anti-TGF-β antibody led to significant increases in both CR (top figure) and OS (bottom figure) in this model.

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Figure 3. The combination of anti-PD-1 and anti-TGF-β led to improved CR and OS in a SCC xenograft model

Systemic inhibition of TGF-β has had significant limitations in the clinic

The multiple tumor-promoting roles associated with TGF-β have led to multiple attempts to develop systemic anti-TGF-β therapies for the treatment of cancer. These strategies include molecules that inhibit TGF-β activation, molecules that prevent the binding of TGF-β to its cognate receptors, and inhibitors that block intracellular signaling. Despite promising in vitro and in vivo activity, the outcomes from clinical trials have shown side effects and inadequate improvement in survival.

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The first generation of anti-TGF-β therapies had dose-limiting side effects including cardiotoxicities, heart valve lesions, increased risk of bleeding and formation of benign tumors, that were associated with inhibiting all three isoforms of TGF-β. Adverse events associated with systemic inhibition of TGF-β led to dose reductions and treatment interruptions that may have contributed to limited efficacy in cancer clinical trials.

Similarly, given the role of TGF-β in checkpoint inhibitor resistance, prior attempts have been made to combine checkpoint inhibitors and anti-TGF-β therapies, although they have not been clinically successful. These approaches include bintrafusp alfa, a bifunctional fusion protein that combines a PD-L1 monoclonal antibody and a TGF-β trap. These agents failed to demonstrate sufficient efficacy in large clinical studies, which we believe may be due to insufficient anti-tumor activity within the TME, a result of PD-L1 predominately being expressed in immune tissue rather than within the TME. We believe a tumor-targeted TGF-β inhibitor may differentiate in its ability to deliver potent anti-tumor activity directly within the TME and minimize toxicity, where untargeted approaches may have struggled.

Our Solution: ficerafusp alfa, a Novel Bifunctional Antibody

Ficerafusp alfa is a bifunctional antibody that combines the well-established biologies of two targets—the anti-EGFR antibody, cetuximab, fused to the extracellular domain of TGF-β receptor 2, or TGF-βRII. As indicated in Figure 4 below, ficerafusp alfa was designed to use EGFR-binding to deliver potent anti-TGF-β therapy directly to EGFR-expressing tumors, potentially removing circulating TGF-β and neutralizing its signaling activity using a strategy known as a “ligand trap”. We believe that localized TGF-β inhibition within the TME has the potential to increase its anti-tumor efficacy and durability, while limiting systemic toxicity. We also deliberately chose EGFR as the tumor-targeting antigen for a TGF-β ligand trap given academic literature supports potential synergistic mechanisms of TGF-β blockade and EGFR signaling inhibition.

Figure 4. Schematic of intended mechanism of action of ficerafusp alfa within the TME to overcome anti-EGFR and anti-PD-1 drug resistance

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Ficerafusp alfa was designed to overcome key shortcomings of prior approaches to targeting EGFR and TGF-β

Specifically, we believe that ficerafusp alfa is differentiated from previous and existing approaches given the following:

•ficerafusp alfa localizes TGF-β inhibition directly to EGFR expressing tumor cells. We believe this will lead to higher concentrations within the TME to increase the inhibition, reduce overall dose and enhance tolerability.

•ficerafusp alfa may help prevent acquired resistance to EGFR-targeted therapies. Dual targeting of TGF-β alongside EGFR may prevent key resistance mechanisms driven by upregulation of TGF-β and may drive durable tumor responses.

•ficerafusp alfa synergizes with anti-PD-1 therapies. Targeting TGF-β directly in the TME may relieve immune cell suppression and exclusion and enhance both the immune response as well as the activity of anti-PD-1 therapies.

Ficerafusp alfa simultaneously binds both EGFR and TGF-β1 with high specificity and drives improved anti-tumor activity

As depicted in Figure 5 below, ficerafusp alfa has a similar affinity for EGFR as cetuximab and the same selectivity for TGF-β1, the cancer-associated isoform of TGF-β, as TGF-βRII-Fc. As illustrated in the graphic on the right in Figure 5 below, in a head-to-head study it was demonstrated that ficerafusp alfa is differentiated in its ability to simultaneously bind to both EGFR and TGF-β1, while no such binding to TGF-β1 was observed when cetuximab was used in place of ficerafusp alfa.

Figure 5. Ficerafusp alfa has potent binding affinities for both EGFR and TGF-β1

Furthermore, Figure 6 below illustrates that in a cutaneous cell carcinoma cell line xenograft model, treatment with ficerafusp alfa showed improved anti-tumor activity compared to both cetuximab monotherapy and to the combination of cetuximab with an equimolar TGF-βRII-Fc construct. This demonstrates the improved anti-tumor activity associated with the bifunctional nature of ficerafusp alfa driving the localization of anti-TGF-β activity to the TME through an EGFR-directed approach.

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Figure 6. Ficerafusp alfa showed improved anti-tumor activity in a cutaneous cell carcinoma cell line xenograft model compared to cetuximab or the combination of cetuximab and TGF-βRII-Fc

Clinical biomarker data demonstrates ficerafusp alfa inhibits TGF-β in tumors

Biomarkers sampled from patients treated with ficerafusp alfa in our Phase 1/1b trials demonstrated direct TGF-β inhibition within the TME and support ficerafusp alfa’s tumor targeted inhibition. As shown in Figure 7 below, treatment with ficerafusp alfa monotherapy at doses greater than 750mg led to statistically significant reductions in phospho-SMAD2, or pSMAD2, which is a direct downstream biomarker of the TGF-β pathway. Figure 7 below also depicts a representative immunohistochemistry, or IHC, slide derived from patient tumor biopsies both prior to and after one dose of 1000mg of ficerafusp alfa monotherapy. Importantly, to our knowledge, this biomarker data represents the first definite demonstration of pSMAD2 inhibition in patient tumors by a TGF-β inhibitor.

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Figure 7. Percent Change from baseline in pSMAD2 from pre-dose to post-dose in patient tumors (left) and representative IHC slide showing statistically significant reduction in pSMAD2 from pre-dose to post-dose at 1000mg of ficerafusp alfa monotherapy in solid tumors (right)

Preclinical in vivo models demonstrate ficerafusp alfa may have an enhanced ability to prevent tumor relapse compared to cetuximab

Preclinical experiments in patient derived xenograft models of EGFR-expressing treatment-naïve HNSCC tumors demonstrate that ficerafusp alfa may have an enhanced ability to prevent tumor relapse compared to cetuximab. While both agents show significant reductions in tumor growth, treatment with ficerafusp alfa demonstrates sustained anti-tumor effects in a treatment-free, or relapse, phase post day 28. This is demonstrated in Figure 8 below in which 5 out of 10 mice receiving cetuximab had a tumor relapse post day 28 that was not observed for those receiving ficerafusp alfa. We believe the prevention of relapse may be attributable to the TGF-β arm of ficerafusp alfa, which is consistent with the mechanistic rationale behind ficerafusp alfa’s design in which inhibiting TGF-β may prevent acquired resistance to anti-EGFR therapy and result in durable anti-tumor activity.

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Figure 8. Ficerafusp alfa demonstrates sustained anti-tumor effects in a patient-derived HNSCC xenograft model compared to cetuximab

Ficerafusp alfa synergizes with anti-PD-1 therapies, with anti-tumor activity superior to anti-PD-1 therapy alone

To assess the synergy between ficerafusp alfa and anti-PD-1 therapies, we developed a cancer mouse model, in which mice were dosed with an anti-PD-1 antibody in combination with ficerafusp alfa. For this Hu-NOG EXL model published in Cancer Research, anti-PD-1 refractory prostate cancer PC3 cells were implanted into mice and once the tumor had grown to 130mm3, mice were randomized into control (n = 10) and test groups which were treated with ficerafusp alfa (n = 10), pembrolizumab (n = 10), or combination of ficerafusp alfa and pembrolizumab (n = 10). This model was powered for statistical significance. These results showed treatment with ficerafusp alfa in combination with pembrolizumab led to a statistically significant improvement in anti-tumor activity compared to pembrolizumab monotherapy, shown in Figure 9 below. We believe this data supports the ability of ficerafusp alfa to synergize with anti-PD-1 therapy in an anti-PD-1 refractory setting and potentially address TGF-β-driven immunosuppression.

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Figure 9. The combination of ficerafusp alfa and anti-PD-1 therapy demonstrates improved anti-tumor activity vs. anti-PD-1 therapy alone in a humanized xenograft model.

Ficerafusp Alfa Clinical Development Guided by Strong Biologic Rationale

We believe ficerafusp alfa has the potential to provide meaningful clinical benefit in solid tumors where there is a strong biologic rationale for the dual inhibition of both EGFR and TGF-β, such as head and neck cancers, colorectal cancer and other squamous cell carcinomas which typically overexpress EGFR and TGF-β pathways.

HNSCC background

Head and neck cancer accounts for approximately 4% of all cancers in the U.S. with over 90% of cases presenting with squamous cell origin. As depicted in Figure 10 below, HNSCC commonly originates in the mouth and throat, from the mucosa of the oral cavity, oropharynx, hypopharynx and larynx. It is estimated that by 2030 there will be approximately one million new cases of HNSCC worldwide annually. At the time of diagnosis, an estimated 10% of patients have metastatic disease, and up to 30% of additional patients develop a recurrence or metastases over time after initial treatment for advanced HNSCC. The median survival of patients with local-regional recurrences or distant metastases is approximately 12 months.

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Figure 10. Subtypes of HNSCC by primary tumor origin. Numbered subtypes indicate where ficerafusp alfa is currently being tested.

Most cases of HNSCC are believed to arise from mutations that accumulate due to carcinogenic exposure, such as tobacco smoke or by HPV. An estimated 80% of cases of R/M HNSCC are HPV-negative, with testing for HPV status typically only being conducted in tumors originating from the oropharynx. HPV-negative patients have significantly worse outcomes compared with HPV-positive patients. HPV-negative HNSCC tumors typically recur locally and are associated with an increased risk of fatal tumor bleeding, excruciating pain and difficulty swallowing. Thus, there is a significant unmet need for therapies with a durable anti-tumor response in this population. HPV-negative HNSCC is also associated with a higher rate of genomic instability resulting in an increased resistance to therapy.

Treatment of R/M HNSCC

The standard of care first-line therapy for R/M HNSCC is determined by CPS which corresponds to the number of PD-L1 positive cells in relation to the total number of viable tumor cells. Patients with high CPS scores tend to respond better to PD-1 checkpoint inhibitors, as observed across multiple tumor types. In R/M HNSCC, pembrolizumab monotherapy is recommended for patients with a CPS greater than or equal to one. Pembrolizumab combined with platinum and 5-fluorouracil is recommended for patients with any PD-L1 status. The addition of chemotherapy to pembrolizumab increases the response rate; however, it also significantly reduces the duration of response while increasing toxicity and leads to roughly equivalent median OS with both treatments. For patients with a CPS less than one and no PD-L1 expression within their TME, the typical standard of care is the EXTREME regimen, a combination of cetuximab and chemotherapy, which has low response rates and survival, as well as a difficult tolerability profile.

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The Phase 3 KEYNOTE-048 trial conducted by Merck & Co investigated pembrolizumab as a monotherapy or in combination with chemotherapy, compared to cetuximab with chemotherapy in first-line R/M HNSCC. The pembrolizumab monotherapy and pembrolizumab and chemotherapy combination response rates of 19% and 36%, respectively, were comparable to the 36% ORR for cetuximab and chemotherapy combination in patients with CPS greater than or equal to one. In these patients, pembrolizumab monotherapy and in combination with chemotherapy led to median OS of 12.3 and 13.6 months, respectively, compared to 10.4 months in the active control arm. While this represents a step forward, there remains significant unmet need in R/M HNSCC for more efficacious therapies that can extend survival, especially for chemotherapy-free alternatives with superior tolerability.

TGF-β expression may limit the effectiveness of HNSCC therapies

Immune checkpoint inhibitors, such as pembrolizumab, activate T cells to attack tumors and their efficacy is dependent on the number of mutations in the tumor. Tumors with more mutations are easier to recognize and are attacked by T cells, thus are the types of tumors that respond more favorably to immune checkpoint inhibitors. Despite the high mutation load in HPV-negative HNSCC, monotherapy with immune checkpoint inhibitors is associated with relatively low ORR compared to other indications such as NSCLC.

Similar observations of poor response rates have been reported for cetuximab in R/M HNSCC. EGFR is expressed in greater than 90% of HNSCC tumors and its overexpression is correlated with decreased survival, resistance to radiation, local treatment failure and increased distant metastasis. In R/M HNSCC, only 13% of patients respond to cetuximab monotherapy, suggesting that there is some form of intrinsic resistance. Third-party clinical studies have demonstrated a statistically significant positive correlation in EGFR-overexpression in HPV-negative HNSCC tumor biopsies.

As depicted in Figure 11 below, third-party clinical studies have shown plasma samples from patients with HPV-negative HNSCC to have significantly higher levels of TGF-β than non-HNSCC controls, whereas TGF-β levels in HPV-positive HNSCC patients are not significantly different than those of controls.

Figure 11. Serum levels of TGF-β are elevated in HPV-negative HNSCC

Therefore, due to the link between EGFR and TGF-β levels and their HPV status, we believe that the dual-inhibition of EGFR and TGF-β signaling in HPV-negative R/M HNSCC has the potential to improve clinical responses and delay or prevent emergence of resistance. Furthermore, third-party studies have shown that TGF-β is an emerging biomarker of resistance to anti-PD-L1 and anti-EGFR-based therapy in advanced HNSCC. Thus, we believe there is strong rationale to pursue the clinical development of ficerafusp alfa, an anti-EGFR and TGF-β-trap bifunctional antibody combined with anti-PD-L1 therapy, such as pembrolizumab, in HNSCC and other squamous cell carcinomas.

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Ongoing Phase 1/1b Trial Evaluating Ficerafusp Alfa

We have conducted an open-label Phase 1/1b trial in patients with EGFR-driven solid tumors which remains open and ongoing. This trial has the goal of establishing safety and tolerability, as well as the recommended dose for expansion for both ficerafusp alfa monotherapy and ficerafusp alfa in combination with pembrolizumab across various tumor types. As illustrated in Figure 12, a total of 46 patients with EGFR-driven advanced solid tumors were given increasing doses of ficerafusp alfa in monotherapy. The first dose tested was 64mg weekly increasing to 1500mg weekly using a “3+3” dose escalation trial design. In combination with pembrolizumab, 15 patients with late-line R/M HNSCC and squamous cancer of the anal canal were dosed. The lowest dose tested in combination with pembrolizumab was 240mg of ficerafusp alfa weekly. Across both monotherapy and in combination, a maximum tolerated dose was not reached. However, an initial recommended dose of 1500mg weekly is being assessed across multiple dose expansion cohorts, including a cohort of patients with first-line R/M HNSCC in combination with pembrolizumab. We expect to enroll up to 200 additional patients across the multiple dose expansion cohorts. This dose was chosen based on safety, tolerability and preliminary efficacy as depicted in the bottom graph in Figure 12.

Figure 12. Schematic of study of safety and tolerability of ficerafusp alfa monotherapy and in combination therapy in patients with EGFR-driven advanced solid tumors across dose escalation cohorts. Preliminary efficacy from dose escalation cohorts with ficerafusp alfa in monotherapy and in combination with pembrolizumab

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Ficerafusp alfa in 1L R/M HNSCC

Our rationale for initial development in 1L R/M HNSCC in combination with pembrolizumab

Our decision to pursue the potential of combination therapy came from both our preclinical rationale and results showing synergy between ficerafusp alfa and pembrolizumab; and from two third-party investigator-sponsored trials, or ISTs, which showed that a combination of cetuximab and PD-1 checkpoint inhibitors in R/M HNSCC led to improved ORR compared to checkpoint inhibitor monotherapy. Importantly, though both of these ISTs are single-arm studies, they were the first demonstration that an approximate doubling in ORR could translate to an increased mPFS, and most notably, significant improvement in OS in first-line R/M HNSCC. The first IST, a 2021 publication in Lancet Oncology, reported an ORR of 48% in a clinical trial assessing cetuximab in combination with pembrolizumab in 33 patients. This was followed by a second IST published in 2022 in Clinical Cancer Research, which reported an ORR of 37% in a trial of cetuximab and nivolumab in 43 patients. These studies showed a 20-month and 18-month mOS in an HPV-negative and HPV-positive population, respectively, an improvement on the 12-month benchmark with pembrolizumab, and support the notion that the addition of anti-EGFR based therapy does not dampen durability of response or OS like a chemotherapy-containing regimen. Consistent with our hypothesis, we began to observe an encouraging objective response rate in late-line R/M HNSCC patients when treated with ficerafusp alfa and pembrolizumab. Based on these multiple data sets, we prioritized this combination treatment to allow for acceleration of its clinical development.

Our decision to rapidly move ficerafusp alfa into first-line therapy for R/M HNSCC in combination with pembrolizumab is aligned with the published goals of the Project FrontRunner initiative from the Oncology Center of Excellence at the FDA. The goals of this initiative include identifying candidate drugs that are appropriate to initially develop for the treatment of early metastatic disease, taking into account clinical, scientific, regulatory and operational considerations. We believe developing ficerafusp alfa as a first-line therapy may allow us to further address the significant unmet need in HNSCC while also potentially increasing durability and survival outcomes consistent with our biologic rationale.

Phase 1/1b expansion cohort of ficerafusp alfa in combination with pembrolizumab in 1L R/M HNSCC

Data from our Phase 1/1b dose expansion cohort evaluating 1500mg of ficerafusp alfa in combination with pembrolizumab in efficacy-evaluable first-line R/M HNSCC patients with a CPS greater than or equal to one was first presented in an oral presentation at an American Society of Clinical Oncology meeting in June 2023. As depicted in Figure 13 below, we demonstrated a meaningful 54% (21/39) ORR across both HPV-negative and HPV-positive R/M HNSCC. We also observed a markedly higher ORR of 64% (18/28) in the HPV-negative subset. This ORR result is consistent with the HPV-negative subset having elevated levels of EGFR and TGF-β where we believe ficerafusp alfa has potential to achieve differentiated clinical outcomes.

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Figure 13. Anti-tumor responses in HNSCC patients, treatment-naïve in the R/M setting, treated with ficerafusp alfa in combination with pembrolizumab

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As depicted in Figure 14 below, in the HPV-negative subset, response rates of more than 50% were observed in both the CPS 1 through 19 and CPS greater than or equal to 20 subgroups, with a 70% (14/20) response rate in patients with locoregional disease involvement. This is notable as pembrolizumab is known to have a lower efficacy in the CPS1-19 subset. We also observed that 18% (5/28) of HPV-negative patients achieved a CR and several other patients achieved deep partial responses, including 5 other patients with responses greater than 80%. The CR rate of approximately 3-5% was previously reported in the ISTs of cetuximab in combination with pembrolizumab or nivolumab, as well as the KEYNOTE-048 study with pembrolizumab in patients with CPS greater than or equal to one. We believe these deep responses and high CR rate are driven by the TGF-β arm of ficerafusp alfa, which we believe, based on our hypothesized mechanism of action, is expected to synergize with pembrolizumab by remodeling the TME and activating the immune system (see Figure 4).

Figure 14. Anti-tumor responses of HPV-negative HNSCC patients treated with ficerafusp alfa and pembrolizumab

In HPV-positive patients, we observed a 27% (3/11) ORR. To evaluate why certain patients seemed to be responding well while others were progressing, we conducted a post hoc analysis of the prior smoking history of the HPV-positive patients to understand its potential impact on responses observed. We hypothesized that patients with a history of smoking may resemble HPV-negative tumor biology as opposed to their disease being driven by the HPV-infection. Similarly, third party studies have demonstrated that a history of smoking has been associated with increased EGFR levels as well. Four of the eleven HPV-positive patients in our study had a heavy smoking history (defined as more than ten pack years in which one pack year is the equivalent of smoking one pack of cigarettes a day for one year) and demonstrated the best responses to ficerafusp alfa as shown below in Figure 15. In these four patients, ficerafusp showed a 75% (3/4) ORR and 100% (4/4) DCR, while it showed a 0% (0/7) ORR and 29% (2/7) DCR in the remaining HPV-positive patients who had no prior history of smoking. Given these results, we plan to initiate an additional expansion cohort of HPV-positive R/M HNSCC patients with a history of heavy smoking in the first half of 2025.

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Figure 15. Prior smoking history may be a factor that impacts the activity seen of ficerafusp alfa + pembrolizumab in HPV-positive patients

In addition to the high ORR and deep partial responses, we observed that the responses in the combination trial were durable and suggestive of enhanced immunological memory. As depicted in Figure 16 below, the mPFS in HPV-negative subjects was 9.8 months, with 57% (16/28) of patients having a PFS greater than 6 months. The PFS benefit in published historical data for pembrolizumab monotherapy was 3.2 months in an HPV-negative and HPV-positive population, and the PFS benefit for cetuximab and anti-PD-1 combination ISTs was 6.2 to 6.5 months in an HPV-negative and HPV-positive population. Furthermore, the durability of response and time to response are demonstrated in Figure 17 below. Notably, several patients have responses lasting greater than 6 months (11/18) and 12 months (5/18), many of whom still remain on therapy. Amongst the responders, 56% (10/18) of responses occurred at the first post-baseline scan after 6 weeks, and 11/18 overall responses remain ongoing; the mDOR and median OS has not yet been reached. We expect to announce updated interim Phase 1/1b data at a future medical meeting in the first half of 2025. Interestingly, we observe patients responding to therapy after 4 months and several responses deepening over time, with 4 patients even converting to CRs after 6 months of follow-up. Median duration of response has not yet been reached. We believe these trends in the data are consistent with our mechanism of action related to the TGF-β inhibition within the TME. We aim to replicate this Phase 1/1b data in a pivotal randomized Phase 2/3 trial as we believe that ficerafusp alfa in combination with pembrolizumab has the potential to become a first-line standard of care therapy in HPV-negative R/M HNSCC.

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Figure 16. HPV-negative R/M HNSCC patients treated with ficerafusp alfa in combination with pembrolizumab had durable responses

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Figure 17. Ficerafusp alfa and pembrolizumab demonstrates an encouraging duration of response

We conducted an exploratory, post hoc biomarker analysis to evaluate ficerafusp alfa’s impact on TGF-β levels in HPV-negative subjects from the Ph.1/1b dose expansion cohort for whom there were available tissue samples (n=7). Specifically, changes in pSMAD2, a direct downstream biomarker of the TGF-β pathway, were measured to characterize on target inhibition of TGF-β directly within the tumor microenvironment. As illustrated in Figure 18 below, treatment with ficerafusp alfa in combination with pembrolizumab demonstrated a marked reduction of pSMAD2 in tumor tissue. Within these seven HPV-negative patients, there were five objective responses (71% ORR). We believe these reductions in pSMAD2 occur in patients with deep responses to therapy, supporting the proposed mechanism of action of ficerafusp alfa.

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Figure 18. Biomarker analysis from HNSCC tumors supports inhibition of TGF-β within the tumor microenvironment

Ficerafusp alfa has been generally well-tolerated with a favorable tolerability profile

Ficerafusp alfa has demonstrated a favorable tolerability profile in this Phase 1/1b trial in combination with pembrolizumab. Across all cohorts to date, approximately 200 patients received at least one dose of ficerafusp alfa. As depicted in Figure 19 below, the most frequent adverse event suspected to be related to treatment with ficerafusp alfa was acneiform rash, which is an adverse event that is also observed in approximately 80% of HNSCC patients treated with cetuximab. It is mechanistically related to anti-EGFR activity and is typically well mitigated by treating physicians with the use of steroids and other topicals. Adverse events associated with TGF-β inhibition include mostly low-grade mucosal bleeding not requiring any medical intervention. Most importantly, there were no deaths determined to be related to ficerafusp alfa monotherapy or combination treatment. The 1500mg ficerafusp alfa weekly dose, which most R/M HNSCC patients received, resulted in approximately 150% greater molar concentration of cetuximab than the maximum approved dose of cetuximab. We believe that the anti-TGF-β activity of ficerafusp alfa may dampen the severity of acneiform rash through its impact on neutrophil trafficking, enabling patients to tolerate this higher dose, which may in turn help drive improved efficacy. Additionally, nearly all hypothesized TGF-β-related adverse events were transient grade 1-2 local mucosal bleeds or epistaxis.

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The safety profile of ficerafusp alfa + pembrolizumab in our Phase 1/1b dose expansion cohort evaluating 1500mg of ficerafusp alfa in combination with pembrolizumab in efficacy-evaluable first-line R/M HNSCC patients with a CPS greater than or equal to one was generally well-tolerated. With a median safety follow-up of at least 11.7 months and a maximum follow up of 25 months, we observed treatment-related adverse events of dermatitis acneiform in 76% of patients, with 12% of these being Grade 3 or Grade 4 treatment-related adverse events, or TRAEs. Five subjects experienced treatment-related severe adverse events of dermatitis acneiform. Five subjects, or 12%, experienced TRAEs that led to discontinuation of ficerafusp alfa and/or pembrolizumab. Historical pembrolizumab combinations, including lenvatinib or chemotherapy, showed TRAEs leading to discontinuation rates of 28% and 33%, respectively.

Figure 19. Most common (>10%) related adverse events summarized by preferred term and maximum grade

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FORTIFI-HN01: Our Phase 2/3 trial in 1L R/M HNSCC

As a result of our discussions with the FDA, we believe that ficerafusp alfa has a path to accelerated approval using an ORR-based interim endpoint with confirmatory approval based on an OS endpoint. We have designed a double-blinded placebo-controlled pivotal FORTIFI-HN01 Phase 2/3 trial of ficerafusp alfa in combination with pembrolizumab as a first-line therapy in R/M HNSCC excluding patients with HPV-positive OPSCC. As seen in Figure 20 below, the registrational study begins with a dose optimization run-in that randomizes patients 1:1:1 to receive either ficerafusp alfa high dose (1500mg weekly) in combination with pembrolizumab, ficerafusp alfa low dose (750mg weekly) in combination with pembrolizumab, or placebo plus pembrolizumab. The total study will enroll approximately 650 patients, which we believe is sufficiently powered to achieve results that may lead to regulatory approval. We enrolled the first patients in our FORTIFI-HN01 Phase 2/3 trial in February 2025 and project that the ORR interim analysis conducted on approximately 415 patients may occur by 2027.

Figure 20. Schematic of ficerafusp alfa + pembrolizumab FORTIFI-HN01 Phase 2/3 trial design

FORTIFI-HN01 Phase 2/3 trial has a seamless design that potentially allows for efficient path-to-market

As seen in Figure 21 below, this registrational study is designed with a dose selection run-in of approximately 10-20 patients per arm, consistent with the objectives of the FDA’s Project Optimus. Project Optimus is an initiative by the FDA’s Oncology Center for Excellence which is an initiative to reform the dose optimization and dose selection paradigm in oncology drug development to emphasize selection of an optimal dose, which is a dose or doses that maximizes not only the efficacy of a drug but the safety and tolerability as well. In our FORTIFI-HN01 study, once 10-20 patients in each treatment arm have had at least 12 weeks of follow-up, the optimal dose will be assessed and then chosen. During this time period of dose selection, enrollment will not be stopped, so that by the time the optimal dose has been selected, we anticipate having enrolled between 60-80 patients in each treatment arm. Importantly, this FORTIFI-HN01 Phase 2/3 trial design enables the patients enrolled in the optimal dose treatment arm during dose selection to contribute to the primary analyses of the FORTIFI-HN01 Phase 2/3 trial, while those enrolled in the non-optimal treatment arm will not.

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Figure 21. FORTIFI-HN01 Phase 2/3 trial is designed such that patients enrolled in dose selection at the optimal dose will contribute to the final efficacy analyses, while those at the non-optimal dose will not contribute to the final efficacy analyses.

FORTIFI-HN01 optimal biological dose (OBD) decision will be informed by the totality of both open-label and randomized data in the FORTIFI-HN01 Phase 2/3 trial

The dose determination in FORTIFI-HN01 Phase 2/3 trial will be informed by not only the 10-20 patients in each ficerafusp alfa containing treatment arm, but also open label data sets from our Phase 1/1b trial, as demonstrated in Figure 22 below. This includes data previously presented from our dose expansion cohort evaluating 1500mg QW of ficerafusp alfa in combination with pembrolizumab in HPV-negative R/M HNSCC. Additionally, we currently have an ongoing open-label expansion cohort of approximately 30 patients with HPV-negative R/M HNSCC to evaluate a 750mg weekly dose that will also help inform the dose selection. We believe this ongoing expansion cohort will be critical to assess the extended safety and durability of 750mg QW dose of ficerafusp alfa, given it will have at least 1 year of follow up in all patients by the time of dose selection.

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Figure 22: The totality of data in 1L HPV-negative R/M HNSCC will inform the dose selection in FORTIFI-HN01 Phase 2/3 trial

Separately, we are also evaluating alternative dosing schedules, such as a once every two weeks (Q2W) dose that will not impact the FORTIFI-HN01 Phase 2/3 trial dose selection or trial itself but may inform a bridging strategy to a Q2W dose in parallel to FORTIFI-HN01 Phase 2/3 trial and in advance of a potential approval.

Potential expansion opportunities for ficerafusp alfa

We believe that there is potential to expand the use of ficerafusp alfa to other populations of HNSCC patients. Preliminary data from our dose escalation cohort in combination with pembrolizumab have shown durable responses in R/M patients who are refractory to both cetuximab and pembrolizumab, and in patients with a CPS of zero. These early data potentially suggest an ability for ficerafusp alfa to synergize with pembrolizumab in checkpoint-refractory tumors, and we have initiated an expansion cohort in patients with HPV-negative R/M HNSCC with a CPS of zero and expect to present preliminary efficacy data at a future medical meeting in 2026. Should we see responses beyond what is typically expected with chemotherapy regimens, we believe there is an opportunity to expand the development of ficerafusp alfa in combination with pembrolizumab to the approximately 20% of the R/M HNSCC that do not express PD-L1 and provide a chemotherapy-free alternative. Additionally, in R/M HNSCC, given the results observed in our Phase 1/1b expansion cohort in HPV-positive patients with a history of heavy smoking, we plan to initiate an additional expansion cohort in these patients in the first half of 2025.

In addition, the encouraging anti-tumor activity of ficerafusp alfa, specifically its durability and its tolerability profile, suggests that there is potential to develop it for the treatment of HPV-negative LA-HNSCC. Treatment for LA-HNSCC often involves combinations of radiation therapy and chemotherapy or cetuximab, and potentially surgical resection for eligible candidates. Radiation therapy has been associated with increases in TGF-β and thus there is mechanistic rationale to explore ficerafusp in combination with radiation therapy in LA-HNSCC. Not only does this approach target potential resistance early in the course of disease, but it may also reduce potential effects of radiation therapy such as scarring and fibrosis to preserve organ function and improve quality of life in patients. We believe that our investigator-initiated studies will start in 2025 to signal-seek in several areas in LA-HNSCC, including in the neoadjuvant setting.

Ficerafusp alfa expansion into colorectal cancer (CRC)

Beyond HNSCC, we believe that there is also potential to develop ficerafusp alfa both in monotherapy and in combination for the treatment of other EGFR-expressing tumors, such as colorectal cancer where EGFR-targeted

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therapies have already demonstrated clinical efficacy, and are key agents of current standard of care. Importantly in CRC, TGF-β inhibition has the potential to improve upon both the efficacy and durability of existing therapies. As highlighted previously, TGF-β impacts metastasis in CRC in several ways including EMT, in which tumor cells transition to become more invasive and spread to distant sites. Upon treatment with EGFR therapy, increases in TGF-β levels, EMT signature, and cancer associated fibroblasts have been observed in CRC, which supports the rationale to simultaneous inhibit TGF-β while targeting EGFR with ficerafusp alfa. Additionally, TGF-β facilitates metastasis in CRC by promoting angiogenesis, immunosuppression, and stemness.

We plan to initiate an initial Ph. 1/2 proof of concept study in unresectable, metastatic CRC patients in 2025. This study will evaluate ficerafusp alfa as a monotherapy and in combination with pembrolizumab in microsatellite stable (MSS) patients that do not have a RAS/BRAF mutation and who have received 2-3 prior lines of therapy. As highlighted in Figure 23 below, the initial cohorts will enroll ~20 patients in Stage 1 to evaluate safety, tolerability, and preliminary efficacy, with the opportunity to expand to ~50 patients in each arm pending a positive signal.

Figure 23: Overview of Ph.1/2 study evaluating ficerafusp alfa monotherapy or in combination with pembrolizumab in metastatic CRC

Ficerafusp alfa expansion into squamous cell carcinoma of the anal canal (SCAC)

The global incidence and mortality of anal cancer have increased in recent years, with more than 54,000 cases and 22,000 deaths reported in 2022; the most common form of anal cancer is squamous cell carcinoma of the anal canal (SCAC). Treatments for advanced SCAC often include combination chemotherapy with carboplatin and paclitaxel or other chemotherapy combinations, followed by PD-1 immune checkpoint blockade. Anti-PD1 monotherapy has limited efficacy in patients with treatment-refractory advanced SCAC. For example, results from the KEYNOTE-158 study of pembrolizumab alone in 2L SCAC showed an ORR = 11%, DCR = 26% and 12-month PFS rate of 15%.

Preliminary data from our Phase 1/1b dose expansion cohort evaluating 1500mg of ficerafusp alfa in combination with pembrolizumab in second-line or later SCAC patients was recently presented in a poster session at the 2025 American Society of Clinical Oncology Gastrointestinal (ASCO-GI) Cancers Symposium in January 2025. This cohort enrolled locally advanced / unresectable or metastatic SCAC patients who had received 1-2 prior lines of chemotherapy and had not previously received a checkpoint inhibitor. As depicted in Figure 24 below, the combination demonstrated a meaningful 29% (8/28) ORR, as well as a 64% (18/28) DCR. Median duration of response for patients who demonstrated a CR or PR was not reached as of data cutoff, but included four patients with responses maintained for at least 6 months. Median PFS was 2.9 months with a 12-month PFS rate of 40.7%.

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Importantly, the combination demonstrated activity in patients with liver metastasis with a 31% (4/13) ORR. Given these encouraging results, we plan to evaluate future development paths in SCAC, including potential development in the first-line setting.

Figure 24: Anti-tumor activity of ficerafusp alfa in combination with pembrolizumab in locally advanced / unresectable or metastatic SCAC previously treated with 1-2 prior lines of chemotherapy

Ficerafusp alfa expansion into cutaneous squamous cell carcinoma (CSCC)

We believe ficerafusp alfa has the potential to provide meaningful clinical benefit in CSCC, a cancer type that results in up to 8,800 deaths annually in the U.S and in which there is a strong biologic rationale for the dual inhibition of both EGFR and TGF-β. We have demonstrated preliminary activity of ficerafusp alfa as a monotherapy in CSCC in our ongoing Phase 1/1b trial. As shown in Figure 25, ficerafusp alfa showed a preliminary 42% (5/12) ORR as a second-line therapy in patients with CSCC who were refractory to a PD-1 checkpoint inhibitor, a population in which historical response rates are approximately 5% with chemotherapy. This cohort continues to enroll patients and we expect to share updates to this preliminary data set at a future medical meeting in the first half of 2025.

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Figure 25. ficerafusp alfa monotherapy led to a preliminary 42% (5/12) ORR in 12 patients

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Competition

The biotechnology and pharmaceutical industries are characterized by intense competition to develop new products and technologies. We compete directly with companies dedicating their resources to advance novel therapies for the treatment of cancer. We face substantial competition from multiple sources, including large pharmaceutical and biotechnology companies, academic research institutions, governmental agencies and public and private research institutions. We anticipate that we will continue to face increasing competition as new therapies, technologies and data emerge within the field of oncology and, more specifically, for the treatment of HNSCC.

We expect to compete with commercially available therapies for the treatment of HNSCC, including pembrolizumab (marketed as Keytruda by Merck & Co); the combination of pembrolizumab, platinum chemotherapy and 5-fluorouracil; and the combination of cetuximab (marketed as Erbitux by Eli Lilly in the U.S. and by Merck KGaA outside of the U.S.), platinum chemotherapy and 5-fluorouracil. In addition, there are numerous companies that are developing new treatments for HNSCC, including Merck & Co, Pfizer Inc., Johnson & Johnson, Exelixis, Inc., Incyte Corporation, Beigene, Ltd., Merus N.V., iTeos Therapeutics Inc., Immutep, Inc., Inhibrix Biosciences, Inc., Iovance Biotherapeutics, Inc., Kura Oncology, Inc. and ALX Oncology Holdings, Inc.

Some of our competitors have significantly greater financial resources and expertise in areas such as research and development, manufacturing, regulatory protocols and marketing. Mergers and acquisitions in the pharmaceutical, biopharmaceutical and biotechnology industries may result in a concentration of incremental resources amongst a fewer number of our competitors. Early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with larger and more well-established companies. These companies also compete with us in the recruitment and retainment of top qualified scientific and/or management personnel, establishment of clinical trial sites and patient registration for clinical trials and acquisition of technologies complementary to, or necessary for, our programs.

If our product candidates do not offer sustainable advantages over other available products, we may not be able to successfully compete against current and future competitors. Our competitors also may obtain FDA or other regulatory approval for their products more rapidly, resulting in a stronger or dominant market position before we are able to enter the market. The key factors that will ultimately affect the success of our bifunctional therapies, if approved, are likely their safety, efficacy, convenience and cost.

Contract Transfer And License Agreement with Biocon

On October 1, 2019, we entered into a Contract Transfer and License Agreement, or the Biocon Agreement, with Biocon Limited, or Biocon. Pursuant to the Biocon Agreement, we and Biocon agreed that Biocon would grant us a license, with the right to grant and authorize sublicenses to make, use, sell, offer to sell, import, and otherwise exploit certain fusion protein products of which ficerafusp alfa was the most advanced program. Under the Biocon Agreement, Biocon also assigns to us the “Assumed Contracts,” which include master services agreements, an authorization letter, an evaluation license agreement with Life Technologies Corporation, or the Life Technologies Agreement, consultancy agreements, a research agreement and a quality agreement.

Each Assumed Contract was fully transferred to us at the time we executed the Biocon Agreement. With exception of the Life Technologies Agreement, each Assumed Contract has been terminated. While the Life Technologies Agreement is still in effect, it imposes no material obligations on us and no costs have been incurred since 2019.

In connection with the Biocon Agreement, we paid INR 550 million as consideration for the license grant. Under the Biocon Agreement, Biocon is required on a calendar quarterly basis to deliver any additional materials or know-how relating to the product up until a mid-single digit anniversary from the effective date of the Biocon Agreement. In the event of an acquisition of all or substantially all of our assets and business by a third party, this obligation shall terminate. Additionally, we have assumed sole responsibility for complying with any post-approval developments and post-marketing activities such as routine and non-routine pharmacovigilance monitoring and post-marketing surveillance for the products – including any and all clinical trials.

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The Biocon Agreement is governed by English law and does not contain any termination rights. Under English law, we and Biocon could mutually agree to terminate the Biocon Agreement. Additionally, there are no future milestone payments, royalty terms or any additional payments required.

Clinical Trial Collaboration And Supply Agreement with MSD

On May 19, 2022, we entered into a Clinical Trial Collaboration and Supply Agreement, or the MSD Agreement, with MSD International GmbH, or MSDIG, and MSD International Business GmbH, MSDIB, and collectively with MSDIG, MSD. Pursuant to the MSD Agreement, we provide ficerafusp alfa and MSD provides pembrolizumab to be used in combination in a clinical trial sponsored by us. The clinical trial is a First-in-Human, Phase 1/1b, Open-label, Multicenter Study intended to characterize the safety, tolerability and recommended dose of single agent ficerafusp alfa and combination ficerafusp alfa plus pembrolizumab. To facilitate such collaboration activities and information exchange and pursuant to the MSD Agreement, we and MSD created a joint development committee with an equal number of representatives from each party.

Pursuant to the MSD Agreement, all clinical data resulting from the portion of the clinical trial involving the combination of ficerafusp alfa and pembrolizumab is jointly owned by both us and MSD. We own all clinical data resulting from the part of the clinical trial involving ficerafusp alfa alone or in combination with other treatments that are not pembrolizumab, and MSD owns all clinical data resulting from the part of the clinical trial involving pembrolizumab alone or in combination with other treatments that are not ficerafusp alfa.

The MSD Agreement also sets forth our regulatory responsibilities as the sponsor of the clinical trial – such as obtaining all necessary regulatory approvals, maintaining reports and other related documentation in a scientific and legally compliant manner, and handling safety reporting. Prior to dosing any patient with MSD’s compound, we are required to organize and invite MSD to attend a safety review meeting to discuss the most recent clinical safety data (and other data reasonably requested by MSD to evaluate the safety of the proposed study arms). We have also been responsible for preparing the patient informed-consent form for MSD’s compound study (in consultation with MSD) and transmitting data on severe adverse events from the MSD compound study to MSD. Each party is responsible for its own internal costs and expenses to support the clinical trials.

The term of the MSD Agreement commenced on May 19, 2022 and will expire once we deliver the final documents, signifying the completion of the clinical trial, unless the MSD Agreement is earlier terminated in accordance with the terms of the MSD Agreement. Pursuant to the MSD Agreement, MSD may terminate the MSD Agreement early if it believes its products are being used unsafely. Either party may terminate the MSD Agreement early for breach, regulatory action, force majeure, or concerns about patient safety. Additionally, either party may terminate the MSD Agreement early if one is planning to discontinue development of its own compound for medical, scientific or legal reasons.

Intellectual Property

We seek to protect the intellectual property and proprietary technology that we consider important to our business, including by pursuing patent applications that cover our product candidates and methods of using the same, as well as any other relevant inventions and improvements that we believe to be commercially important to the development of our business. We also rely on trade secrets, know-how and continuing technological innovation to develop and maintain our proprietary and intellectual property position. Our commercial success depends, in part, on our ability to obtain, maintain, enforce and protect our intellectual property and other proprietary rights for the technology, inventions and improvements we consider important to our business, and to defend any patents we may own or in-license in the future, prevent others from infringing any patents we may own or in-license in the future, preserve the confidentiality of our trade secrets, and operate without infringing, misappropriating or otherwise violating the valid and enforceable patents and proprietary rights of third parties.

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As with other biotechnology and pharmaceutical companies, our ability to maintain and solidify our proprietary and intellectual property position for our product candidates and technologies will depend on our success in obtaining effective patent claims and enforcing those claims if granted. However, our pending patent applications, and any patent applications that we may in the future file or license from third parties, may not result in the issuance of patents and any issued patents we may obtain do not guarantee us the right to practice our technology or commercialize our product candidates. We also cannot predict the breadth of claims that may be allowed or enforced in any patents we may own or in-license in the future. Any issued patents that we may own or in-license in the future may be challenged, invalidated, circumvented or have the scope of their claims narrowed. In addition, because of the extensive time required for clinical development and regulatory review of a product candidate we may develop, it is possible that, before any of our product candidates can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby limiting the protection such patent would afford the respective product and any competitive advantage such patent may provide.

The term of individual patents depends upon the date of filing of the patent application, the date of patent issuance and the legal term of patents in the countries in which they are obtained. In most countries, including the United States, the patent term is 20 years from the earliest filing date of a nonprovisional patent application. In the United States, a patent’s term may be lengthened by patent term adjustment, which compensates a patentee for administrative delays by the USPTO in examining and granting a patent, or may be shortened if a patent is terminally disclaimed over an earlier expiring patent. The term of a patent claiming a new drug product may also be eligible for a limited patent term extension when FDA approval is granted, provided statutory and regulatory requirements are met. The restoration period granted on a patent covering a product is typically one-half the time between the effective date of a clinical investigation involving human beings is begun and the submission date of an application, plus the time between the submission date of an application and the ultimate approval date. The restoration period cannot be longer than five years, and the restoration period may not extend the patent term beyond 14 years from the date of FDA approval. Only one patent applicable to an approved product is eligible for the extension, and only those claims covering the approved product, a method for using it, or a method for manufacturing it may be extended. Additionally, the application for the extension must be submitted prior to the expiration of the patent in question. A patent that covers multiple products for which approval is sought can only be extended in connection with one of the approvals. The United States Patent and Trademark Office reviews and approves the application for any patent term extension or restoration in consultation with the FDA. In the future, if our product candidates receive approval by the FDA, we expect to apply for patent term extensions on one issued patent covering each of those products, depending upon the length of the clinical studies for each product and other factors. There can be no assurance that patents will issue from our current or future pending patent applications, or that we will benefit from any patent term extension or favorable adjustments to the terms of any patents we may own or in-license in the future. In addition, the actual protection afforded by a patent varies on a product-by-product basis, from country-to-country, and depends upon many factors, including the type of patent, the scope of its coverage, the availability of regulatory-related extensions, the availability of legal remedies in a particular country and the validity and enforceability of the patent. Patent term may be inadequate to protect our competitive position on our products for an adequate amount of time.

Our policy is to file patent applications to protect technology, inventions and improvements to inventions that may be commercially important to the development of our business. We seek patent protection in the U.S. and foreign countries for a variety of technologies, including our ficerafusp alfa product candidate and methods of treating cancer using the same.

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Ficerafusp alfa

We have an exclusive license from Biocon Limited to one patent family directed to ficerafusp alfa and other fusion proteins. As of December 31, 2024, the patent contains one U.S. patent directed to ficerafusp alfa composition of matter; one U.S. patent directed to methods of using ficerafusp alfa; one European patent directed to ficerafusp alfa composition of matter and its use; and one issued patent in each of Australia, Canada, India, Japan, New Zealand, Russia, Malaysia, and the United Arab Emirates, each related to ficerafusp alfa. Each of the U.S. and foreign patents is expected to expire in 2033; in each instance provided that all appropriate maintenance fees are paid and not including any patent term adjustment, patent term extension, Supplementary Protection Certificate, or SPC, or the like. The patent family also contains a number of pending patent applications in the U.S., Europe, Canada, and China. Any patents that issue based on these patent applications, if granted and all appropriate maintenance fees paid, are expected to expire in 2033, not including any patent term adjustment, patent term extension, SPC, or the like.

As of December 31, 2024, we also solely own a patent portfolio containing four patent families each containing pending patent applications that, if issued, may provide additional intellectual property protection for ficerafusp alfa. Each of the four patent families in this patent portfolio are listed below.

As of December 31, 2024, we solely own one patent family directed to formulations of ficerafusp alfa that contains pending patent applications in the U.S., Australia, Brazil, Canada, China, Europe, Hong Kong, India, Japan, New Zealand, and the United Arab Emirates. Any patents that issue based on these patent applications, if granted and all appropriate maintenance fees paid, are expected to expire in 2041, not including any patent term adjustment, patent term extension, SPC, or the like.

As of December 31, 2024, we solely own one patent family directed to methods of using ficerafusp alfa in combination with programmed cell death protein 1, or PD1, targeting agents that contains pending patent applications in the U.S., Australia, Brazil, Canada, China, Europe, Hong Kong, India, Japan, New Zealand, and the United Arab Emirates. Any patents that issue based on these patent applications, if granted and all appropriate maintenance fees paid, are expected to expire in 2041, not including any patent term adjustment, patent term extension, SPC, or the like.

As of December 31, 2024, we solely own one patent family directed to methods of using ficerafusp alfa in combination with Kirsten ras oncogene homolog, or KRAS, targeting agents that contains a pending U.S. patent application, a pending PCT patent application, and a pending Taiwanese patent application. Any patents that issue based on these patent applications, if granted and all appropriate maintenance fees paid, are expected to expire in 2044, not including any patent term adjustment, patent term extension, SPC, or the like.

Manufacturing

We have leveraged multiple third-party manufacturers to support the manufacturing of ficerafusp alfa for clinical trials and, if we receive regulatory approval, we intend to rely on such third parties for commercial manufacture. We do not own or operate, and currently have no plans to establish, any manufacturing facilities. We believe this strategy will enable us to maintain a nimble, efficient, and effective working model without making significant internal capital investments. We are focused on developing high-yield and scalable processes and analytical methods for the manufacture of ficerafusp alfa. We believe our manufacturing scale will support drug supply for our future clinical trials and commercial demand for ficerafusp alfa to treat R/M HNSCC squamous cell carcinoma, if approved. We currently obtain our supplies from third-party manufacturers on a purchase order basis and do not have any long-term supply agreements in place. Specifically, Biocon Biologics, Ltd., Syngene and WuXi Bio are our principal clinical drug suppliers, amongst others, and Thermo Fisher Scientific and affiliated entities are our drug product and packaging suppliers. We are currently considering options for commercial product suppliers and will finalize our decisions in due course. To de-risk our supply chain, and as we advance toward potential commercialization, we intend to enter into long-term supply agreements as well as evaluate additional product manufacturing sources.

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Government Regulation

Government authorities in the U.S., including federal, state, and local authorities, and in other countries, extensively regulate, among other things, the manufacturing, research and clinical development, marketing, labeling and packaging, storage, distribution, post-approval monitoring and reporting, advertising and promotion, and export and import of biological products, such as those we are developing. In addition, some government authorities regulate the pricing of such products. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local, and foreign statutes and regulations require the expenditure of substantial time and financial resources.

Review and Approval for Licensing Biologics in the U.S.

In the U.S., the FDA regulates biological products under the Federal Food, Drug, and Cosmetic Act, or the FDCA, the Public Health Service Act, or the PHSA, and their implementing regulations. FDA approval is required before any biological product can be marketed in the U.S. Biological products are also subject to other federal, state, and local statutes and regulations. If we fail to comply with applicable FDA or other requirements at any time during the product development process, clinical testing, the approval process or after approval, we may become subject to administrative or judicial sanctions or other consequences, including the FDA’s refusal to allow us to proceed with clinical testing, issuance of clinical holds for planned or ongoing studies, refusal to approve pending applications, license suspension or revocation, withdrawal of an approval, issuance of untitled or warning letters, product recalls, product seizures, import detentions or refusals, total or partial suspension of manufacturing or distribution, injunctions, fines, civil penalties or criminal prosecution. Any such action could have a material adverse effect on us.

The process required by the FDA before product candidates may be marketed in the U.S. generally involves the following:

•completion of extensive nonclinical laboratory tests and nonclinical animal studies in compliance with applicable good laboratory practices, or GLP, requirements;

•submission to the FDA of an investigational new drug, or IND, application, which must become effective before human clinical trials may begin in the U.S. and must be updated annually;

•approval by an independent institutional review board, IRB, or ethics committee representing each clinical site before each clinical trial may be initiated;

•performance of adequate and well-controlled human clinical trials in accordance with good clinical practices, or GCPs, to establish the safety and efficacy of the product candidate for each proposed indication;

•manufacture of the drug substance and drug product in accordance with the FDA’s current good manufacturing practice, or cGMP, requirements, along with required analytical and stability testing;

•preparation of and submission to the FDA of a biologics license application, or BLA, requesting marketing approval for one or more proposed indications, that includes sufficient evidence of establishing the safety, purity and potency of the proposed biological product for its intended indication, including from results of nonclinical testing and clinical trials;

•review of the product application by an FDA Advisory Committee, where appropriate and if applicable;

•a determination by the FDA within 60 days of its receipt of a BLA to file the application for review;

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•satisfactory completion of one or more FDA pre-approval inspections of the manufacturing facility or facilities where the proposed product is produced to assess compliance with cGMPs and to assure that the facilities, methods, and controls are adequate to preserve the product’s identity, quality, and strength;

•satisfactory completion of any FDA audits of the nonclinical studies and clinical trial sites to assure compliance with GLPs and GCPs, as applicable, and the integrity of data in support of the BLA;

•payment of user fees under the Prescription Drug User Fee Act, or the PDUFA, unless exempted; and

•the FDA’s review and approval of the BLA.

The nonclinical and clinical testing and approval process requires substantial time, effort, and financial resources, and we cannot be certain that any approvals for our product candidates will be granted on a timely basis, if at all.

Nonclinical Studies and Investigational New Drug Application

Before testing any biological product in humans, a product candidate must undergo rigorous preclinical testing. Preclinical studies include laboratory evaluations of product chemistry, formulation, and stability, as well as in vitro and animal studies to assess safety and in some cases to establish the rationale for therapeutic use. The conduct of preclinical studies is subject to federal and state regulation and requirements, including GLP requirements for safety/toxicology studies. The results of the preclinical studies, together with manufacturing information and analytical data, must be submitted to the FDA as part of an IND.

An IND is a request for authorization from the FDA to administer an investigational biological product to humans in clinical trials in the U.S. The central focus of an IND submission is on the general investigational plan, the protocol(s) for human trials and the safety of trial participants. The IND also includes results of animal and in vitro studies assessing the toxicology, pharmacokinetics, pharmacology, and pharmacodynamic characteristics of the product; chemistry, manufacturing and controls information; and any available human data or literature to support the use of the investigational product. An IND must become effective before human clinical trials may begin. An IND will automatically become effective 30 days after receipt by the FDA, unless before that time the FDA raises concerns or questions related to the proposed clinical trials. In such a case, the IND may be placed on clinical hold and the IND sponsor and the FDA must resolve any outstanding concerns or questions before clinical trials can begin. Accordingly, submission of an IND may or may not result in the FDA allowing clinical trials to commence.

At any time during the initial 30 day IND review period or while clinical trials are ongoing under the IND, the FDA may impose a partial or complete clinical hold. Clinical holds may be imposed by the FDA when there is concern for patient safety, and may be a result of new data, findings, or developments in clinical, nonclinical, and/or chemistry, manufacturing and controls or where there is non-compliance with regulatory requirements. A clinical hold would delay either a proposed clinical trial or cause suspension of an ongoing trial, until all outstanding concerns have been adequately addressed and the FDA has notified the company that investigations may proceed. A separate submission to an existing IND must also be made for each successive clinical trial to be conducted, and the FDA must grant permission, either explicitly or implicitly by not objecting, before each clinical trial can begin.

Clinical Trials

Clinical trials involve the administration of the investigational product to human subjects under the supervision of qualified investigators in accordance with GCPs, which include the requirement that all research subjects provide their informed consent for their participation in any clinical trial. Clinical trials are conducted under protocols detailing, among other things, the objectives of the trial, the inclusion and exclusion criteria, the parameters to be used in monitoring safety, and the efficacy criteria to be evaluated. A protocol for each clinical trial and any subsequent protocol amendments must be submitted to the FDA as part of the IND.

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Additionally, approval must also be obtained from each clinical trial site’s IRB, before the trials may be initiated and the IRB must monitor the trial until completed. The IRB will consider, among other things, clinical trial design, patient informed consent, ethical factors, the safety of human subjects and the possible liability of the institution. There are also requirements governing the reporting of ongoing clinical trials and clinical trial results to public registries, including on clinicaltrials.gov.

The clinical investigation of a biological product is generally divided into three or four phases. Although the phases are usually conducted sequentially, they may overlap or be combined.

Phase 1. The investigational product is initially introduced into healthy human subjects or, in the case of some products designed to address severe or life-threatening diseases, patients with the target disease or condition. These trials are designed to evaluate the safety, dosage tolerance, metabolism and pharmacologic actions of the investigational product in humans, the side effects associated with increasing doses, and if possible, to gain early evidence on effectiveness.

Phase 2. The investigational product is administered to a limited patient population to evaluate dosage tolerance and optimal dosage, identify possible adverse side effects and safety risks, and preliminarily evaluate efficacy.

Phase 3. The investigational product is administered to an expanded patient population, generally at geographically dispersed clinical trial sites to generate enough data to statistically evaluate safety, purity and potency, to evaluate the overall benefit-risk profile of the investigational product, and to provide an adequate basis for physician labeling.

Phase 4. In some cases, the FDA may condition approval of a BLA for a product candidate on the sponsor’s agreement to conduct additional clinical trials after approval or a sponsor may voluntarily conduct additional clinical trials after approval to gain more information about the biological product. Such post-approval trials are typically referred to as Phase 4 clinical trials.

Sponsors must also report to the FDA, within certain timeframes, serious and unexpected adverse reactions, any clinically important increase in the rate of a serious suspected adverse reaction over that listed in the protocol or investigator’s brochure, or any findings from other studies or animal or in vitro testing that suggest a significant risk in humans exposed to the product candidate. The FDA, the IRB, or the clinical trial sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects are being exposed to an unacceptable health risk. Additionally, some clinical trials are overseen by an independent group of qualified experts organized by the clinical trial sponsor, known as a data and safety monitoring board or committee. This group provides authorization for whether or not a trial may move forward at designated check points based on access to certain data from the trial. We may also suspend or terminate a clinical trial based on evolving business objectives or competitive climate.

A sponsor of an investigational biological product for a serious disease or condition is required to make available, such as by posting on its website, its policy on evaluating and responding to requests for individual patient access to such investigational biological product. This requirement applies on the earlier of the first initiation of a Phase 2 or Phase 3 trial of the investigational biological product or, as applicable, 15 days after the biological product receives a designation as a breakthrough therapy or fast track product.

Concurrent with clinical trials, sponsors usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the product candidate and finalize a process for manufacturing the drug product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product candidate and manufacturers must develop, among other things, methods for testing the identity, strength, quality, and purity of the final drug product. Additionally, appropriate packaging must be selected and tested, and stability studies must be conducted to demonstrate that the product candidate does not undergo unacceptable deterioration over its shelf life.

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During the development of a new biologic, sponsors are given opportunities to meet with the FDA at certain points. These points may be prior to submission of an IND, at the end of Phase 1, at the end of Phase 2, and before a BLA is submitted. Meetings at other times may be requested. These meetings can provide an opportunity for the sponsor to share information about the data gathered to date, for the FDA to provide advice, and for the sponsor and the FDA to reach agreement on the next phase of development.

Submission of a BLA to the FDA

Assuming successful completion of all required testing in accordance with all applicable regulatory requirements, detailed investigational product information is submitted to the FDA in the form of a BLA requesting approval to market the product for one or more indications. Under federal law, the submission of most BLAs is subject to an application user fee, and the sponsor of an approved BLA is also subject to an annual program fee for each approved biological product on the market. Applications for orphan drug products are exempted from the BLA application fee and may be exempted from program fees, unless the application includes an indication for other than a rare disease or condition.

A BLA must include all relevant data available from pertinent nonclinical studies and clinical trials, including negative or ambiguous results as well as positive findings, together with detailed information relating to the product’s chemistry, manufacturing, controls, and proposed labeling, among other things. Data can come from company-sponsored clinical trials intended to test the safety and effectiveness of a use of a product, or from a number of alternative sources, including trials initiated by investigators. To support marketing approval, the data submitted must be sufficient in quality and quantity to establish the safety and effectiveness of the investigational product to the satisfaction of the FDA.

The FDA conducts a preliminary review of all BLAs within the first 60 days after submission before accepting them for filing to determine whether they are sufficiently complete to permit substantive review. The FDA may request additional information rather than accept an application for filing. Under the performance goals and policies implemented by the FDA under PDUFA, once a BLA has been submitted, the FDA’s goal for novel biological products generally is to review the application within ten months after it accepts the application for filing, or, if the application is granted priority review, six months after the FDA accepts the application for filing. The FDA does not always meet its PDUFA goal dates, and the review process may be extended. For example, the review process and the PDUFA goal date may be extended by three months if the FDA requests or if the applicant otherwise provides additional data, analysis or information that FDA deems a major amendment.

Before approving a BLA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA will not approve an application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. Additionally, before approving a BLA, the FDA will typically inspect the sponsor and one or more clinical sites to assure compliance with GCPs. Material changes in manufacturing equipment, location, or process post-approval, may result in additional regulatory review and approval.

The FDA is required to refer an application for a novel biological product to an advisory committee or explain why such referral was not made. An advisory committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions.

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The FDA’s Decision on a BLA

On the basis of the FDA’s evaluation of the application and accompanying information, including the results of the inspection of the manufacturing facilities and any FDA inspections of nonclinical and clinical trial sites to assure compliance with GLPs or GCPs, the FDA may approve the BLA or issue a complete response letter. Under the PHSA, the FDA may approve a BLA if it determines the product is safe, pure, and potent, and that the facility in which the product will be manufactured, processed, packaged or held meets standards designed to assure the product’s continued safety, purity and potency. If the FDA determines the product meets those standards, it may issue an approval letter authorizing commercial marketing of the biological product with specific prescribing information for specific indications. If the application is not approved, FDA will issue a complete response letter, which indicates that the review cycle of the application is complete and the application is not ready for approval. A complete response letter will identify the deficiencies that prevent the FDA from approving the application and may require additional clinical data or an additional Phase 3 clinical trial(s), or other significant, expensive and time-consuming requirements related to clinical trials, nonclinical studies or manufacturing. Even if such additional information is submitted, the FDA may ultimately decide that the BLA does not satisfy the criteria for approval and issue a denial.

The FDA could also approve the BLA with a Risk Evaluation and Mitigation Strategy, or REMS, program to mitigate risks, which could include medication guides, physician communication plans, or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. The FDA also may condition approval on, among other things, changes to proposed labeling, development of adequate controls and specifications, or a commitment to conduct one or more post-market studies or clinical trials. Such post-market testing may include Phase 4 clinical trials and surveillance to further assess and monitor the product’s safety and effectiveness after commercialization.

Orphan Drug Designation

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biological product intended to treat a rare disease or condition, which is generally a disease or condition that affects fewer than 200,000 individuals in the U.S., or more than 200,000 individuals in the U.S. and for which there is no reasonable expectation that the cost of developing and making a drug or biological product available in the U.S. for this type of disease or condition will be recovered from sales of the product. Orphan product designation must be requested before submitting a BLA. After the FDA grants orphan product designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan product designation does not convey any advantage in or shorten the duration of the regulatory review and approval process.

Orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages and user-fee waivers. Additionally, if a product that has orphan designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications to market the same drug or biological product for the same indication for seven years, except in limited circumstances, such as a showing of clinical superiority to the product with orphan exclusivity.

The period of exclusivity begins on the date that the marketing application is approved by the FDA and applies only to the indication for which the product has been designated. The FDA may approve a second application for the same product for a different use or a second application for a clinically superior version of the product for the same use. The FDA cannot, however, approve the same product made by another manufacturer for the same indication during the market exclusivity period unless it has the consent of the sponsor, or the sponsor is unable to provide sufficient quantities. If a drug or biological product designated as an orphan product receives marketing approval for an indication broader than what is designated, it may not be entitled to orphan product exclusivity. Orphan medicinal product status in the European Union has similar, but not identical, benefits.

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The FDA has historically taken the position that the scope of orphan exclusivity aligns with the approved indication or use of a product, rather than the disease or condition for which the product received orphan designation. However, in Catalyst Pharms., Inc. v. Becerra, 14 F.4th 1299 (11th Cir. 2021), the court disagreed with this position, holding that orphan-drug exclusivity blocked the FDA’s approval of the same drug for all uses or indications within the same orphan-designated disease. On January 24, 2023, the FDA published a notice in the Federal Register to clarify that the FDA intends to continue to apply its longstanding interpretation of the regulations to all matters outside of the scope of the Catalyst order and will continue tying the scope of orphan-drug exclusivity to the uses or indications for which a drug is approved. It is unclear how future litigation, legislation, agency decisions, and administrative actions will impact the scope of orphan drug exclusivity.

Expedited Review Programs

The FDA offers a number of expedited development and review programs for qualifying product candidates.

New biological products are eligible for fast track designation if they are intended to treat a serious or life-threatening disease or condition and demonstrate the potential to address unmet medical needs for the disease or condition. Fast track designation applies to the combination of the product and the specific indication for which it is being studied. The sponsor of a new biologic may request that the FDA designate the biologic as a fast track product at any time during the clinical development of the product. The sponsor of a fast track product has opportunities for more frequent interactions with the applicable FDA review team during product development and, once a BLA is submitted, the product candidate may be eligible for priority review. A fast track product may also be eligible for rolling review, where the FDA may consider for review sections of the BLA on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections of the BLA, the FDA agrees to accept sections of the BLA and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the BLA.

A product candidate intended to treat a serious or life-threatening disease or condition may also be eligible for breakthrough therapy designation to expedite its development and review. A product candidate can receive breakthrough therapy designation if preliminary clinical evidence indicates that the product candidate, alone or in combination with one or more other drugs or biologics, may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. The designation includes all of the fast track program features, as well as more intensive FDA interaction and guidance beginning as early as Phase 1 and an organizational commitment to expedite the development and review of the product candidate, including involvement of senior managers.

Any marketing application for a biologic submitted to the FDA for approval, including a product candidate with a fast track designation and/or breakthrough therapy designation, may be eligible for other types of FDA programs intended to expedite development and review, such as priority review. An application for a biological product will receive priority review designation if it is for a biological product that treats a serious condition and, if approved, would provide a significant improvement in safety or effectiveness. The FDA will attempt to direct additional resources to the evaluation of an application for a new biological product designated for priority review in an effort to facilitate the review. For original BLAs, priority review designation means the FDA’s goal is to take action on the marketing application within six months of the 60-day filing date (as compared to ten months under standard review).

Fast track designation, breakthrough therapy designation, and priority review do not change the standards for approval but may expedite the development or approval process. Even if a product candidate qualifies for one or more of these programs, the FDA may later decide that the product no longer meets the conditions for qualification or decide that the time period for FDA review or approval will not be shortened.

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Accelerated Approval

Product candidates studied for their safety and effectiveness in treating serious conditions may receive accelerated approval upon a determination that the product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity or prevalence of the condition and the availability or lack of alternative treatments. As a condition of accelerated approval, the FDA will generally require the sponsor to perform adequate and well-controlled post-marketing clinical studies to verify and describe the anticipated effect on irreversible morbidity or mortality or other clinical benefit. Under the Food and Drug Omnibus Reform Act of 2022, or FDORA, the FDA may require, as appropriate, that such trials be underway prior to approval or within a specific time period after the date of approval for a product granted accelerated approval. Under FDORA, the FDA has increased authority for expedited procedures to withdraw approval of a biologic or indication approved under accelerated approval if, for example, the sponsor fails to conduct the required post-marketing studies or if such studies fail to verify the predicted clinical benefit. In addition, for products being considered for accelerated approval, the FDA generally requires, unless otherwise informed by the FDA, that all advertising and promotional materials intended for dissemination or publication within 120 days of marketing approval be submitted to FDA for review during the pre-approval period. After 120 days following marketing approval, unless otherwise informed by the FDA, advertising and promotional materials must be submitted at least 30 days prior to the intended time of initial dissemination or publication.

Post-Approval Requirements

Biological products manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of adverse experiences with the product. After approval, most changes to the approved product, such as adding new dosage forms, indications or other labeling claims, are subject to prior FDA review and approval.

Biological product manufacturers are required to register their establishments with the FDA and certain state agencies and are subject to periodic unannounced inspections for compliance with cGMPs. Changes to the manufacturing process are strictly regulated, and, depending on the significance of the change, may require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements upon us and any third-party manufacturers that we may decide to use. Manufacturers and manufacturers’ facilities are also required to comply with applicable product tracking and tracing requirements and notify the FDA of counterfeit, diverted, stolen and intentionally adulterated products or products that are otherwise unfit for distribution in the U.S. Accordingly, manufacturers must continue to expend time, money and effort in the area of production and quality control to maintain compliance with cGMP and other aspects of regulatory compliance.

A biological product may also be subject to official lot release, meaning that the manufacturer is required to perform certain tests on each lot of the product before it is released for distribution. If the product is subject to official lot release, the manufacturer must submit samples of each lot, together with a release protocol showing a summary of the history of manufacture of the lot and the results of all of the manufacturer’s tests performed on the lot, to the FDA. The FDA may perform certain confirmatory tests on lots of some products before releasing the lots for distribution.

We rely, and expect to continue to rely, on third parties for the production of clinical quantities of our product candidates, and expect to rely in the future on third parties for the production of commercial quantities. Future FDA and state inspections may identify compliance issues at our facilities or at the facilities of our contract manufacturers that may disrupt production, or distribution, or may require substantial resources to correct. In addition, discovery of previously unknown problems with a product or the failure to comply with applicable requirements may result in restrictions on a product, manufacturer or holder of an approved BLA, including withdrawal or recall of the product from the market or other voluntary, FDA-initiated or judicial action that could delay or prohibit further marketing.

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The FDA may suspend or revoke product license approvals if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches the market. Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical trials to assess new safety risks; or imposition of distribution restrictions or other restrictions under a REMS program. FDA has authority to require post-market studies, in certain circumstances, on reduced effectiveness of a biological product and FDA may require labeling changes related to new reduced effectiveness information. Other potential consequences of a failure to maintain regulatory compliance include, among other things:

•restrictions on the marketing or manufacturing of the product, complete withdrawal of the product from the market or product recalls;

•issuance of safety alerts, Dear Healthcare Provider letters, press releases or other communications containing warnings or other safety information about the product;

•untitled letters or warning letters;

•imposition of clinical holds on ongoing clinical trials;

•refusal of the FDA to approve pending BLAs or supplements to approved BLAs, or suspension or revocation of approved BLAs;

•product seizure or detention, or refusal to permit the import or export of products;

•mandated modification of promotional materials and labeling, and the issuance of corrective information;

•consent decrees, corporate integrity agreements, debarment or exclusion from federal healthcare programs; or

•fines, injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates marketing, labeling, advertising, and promotion of prescription drug products, including biological products. These regulations include, among other things, standards and regulations for direct-to- consumer advertising, communications regarding unapproved uses, industry-sponsored scientific and educational activities and promotional activities involving the internet and social media. Promotional claims about a drug’s safety or effectiveness are prohibited before the BLA is approved. Once a BLA is approved, the sponsor can only make those claims relating to safety, efficacy, purity and potency that are consistent with the biological product’s approved label. Additionally, promotional materials for prescription drug products must be submitted to the FDA in conjunction with their first use.

In the U.S., healthcare professionals are generally permitted to prescribe legally available drugs for uses that are not described in the product’s labeling and that differ from those approved by the FDA. The FDA does not regulate the practice of medicine or healthcare providers’ choice of treatments; however, FDA restricts manufacturers’ communications of off-label uses. If a company, including any agent of the company or anyone speaking on behalf of the company, is found to have promoted off-label uses, the company may become subject to adverse public relations and administrative and judicial enforcement by the FDA, the DOJ, or the Office of the Inspector General of HHS, as well as state authorities. This could subject a company to a range of penalties that could have a significant commercial impact, including civil and criminal fines and agreements that materially restrict the manner in which a company promotes or distributes drug products. The federal government has levied large civil and criminal fines against companies for alleged improper promotion and has also requested that companies enter into consent decrees or permanent injunctions under which specified promotional conduct is changed or curtailed.

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Pediatric Trials and Exclusivity

Under the Pediatric Research Equity Act of 2003, a BLA (or BLA supplement thereto) must contain data that are adequate to assess the safety and effectiveness of the product for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. A sponsor who is planning to submit a marketing application for a biological product that includes a new active ingredient, new indication, new dosage form, new dosing regimen or new route of administration must submit an initial Pediatric Study Plan, or PSP, within sixty days of an end of Phase 2 meeting or as may be agreed between the sponsor and FDA. The initial PSP must include an outline of the pediatric study or studies that the sponsor plans to conduct, including study objectives and design, age groups, relevant endpoints and statistical approach, or a justification for not including such detailed information, and any request for a deferral of pediatric assessments or a full or partial waiver of the requirement to provide data from pediatric studies along with supporting information. Generally, development program candidates designated as orphan drugs are exempt from the above requirements. FDA and the sponsor must reach agreement on the PSP. A sponsor can submit amendments to an agreed upon initial PSP at any time if changes to the pediatric plan need to be considered based on data collected from nonclinical studies, early phase clinical trials, and/or other clinical development programs.

The FDA may, on its own initiative or at the request of the applicant, grant deferrals for submission of some or all pediatric data until after approval of the product for use in adults, or full or partial waivers from the pediatric data requirements. The FDA may send a non-compliance letter to any sponsor that fails to submit the required assessment, keep a deferral current or fails to submit a request for approval of a pediatric formulation. Unless otherwise required by regulation, the pediatric data requirements do not apply to products with orphan designation.

Pediatric exclusivity is another type of non-patent exclusivity in the U.S. and, if granted for a biologic, provides for the attachment of an additional six months of marketing protection to the term of any existing regulatory exclusivity for all formulations, dosage forms, and indications of the biologic, including the five-year and three-year non-patent and orphan exclusivity. This six-month exclusivity may be granted if a BLA sponsor submits pediatric data that fairly respond to a written request from the FDA for such data, provided that at the time pediatric exclusivity is granted there is not less than nine months of term remaining. The data do not need to show the product to be effective in the pediatric population studied; rather, if the clinical trial is deemed to fairly respond to the FDA’s request, the additional protection is granted.

Patent Term Restoration

Depending upon the timing, duration, and specifics of the FDA approval of the use of our product candidates, some of our U.S. patents may be eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly referred to as the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years as compensation for patent term lost during product development and the FDA regulatory review process. However, patent term restoration cannot extend the remaining term of a patent beyond a total of 14 years from the product’s approval date. The patent term restoration period is generally one-half the time between the effective date of an IND and the submission date of a BLA, plus the time between the submission date and the approval of that application. Only one patent applicable to an approved product is eligible for the extension and the application for the extension must be submitted prior to the expiration of the patent and within 60 days of the product’s approval. The U.S. Patent and Trademark Office, in consultation with the FDA, reviews and approves the application for any patent term extension or restoration. In the future, we may apply for restoration of patent term for one of our currently owned or licensed patents to add patent life beyond its current expiration date, depending on the expected length of the clinical trials and other factors involved in the filing of the relevant BLA.

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Biosimilars and Exclusivity

The Patient Protection and Affordable Care Act, or the ACA, signed into law on March 23, 2010, includes a subtitle called the Biologics Price Competition and Innovation Act of 2009, or the BPCIA, which created an abbreviated approval pathway for biological products shown to be similar to, or interchangeable with, an FDA-licensed reference biological product. Biosimilarity, which requires that there be no clinically meaningful differences between the proposed biological product and the reference product in terms of safety, purity, and potency, can be shown through analytical studies, animal studies, and a clinical trial or trials. Interchangeability requires that a product is biosimilar to the reference product, can be expected to produce the same clinical results as the reference product and, for products administered multiple times, that the biologic and the reference biologic may be switched after one has been previously administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biologic.

Under the BPCIA, an application for a biosimilar product may not be submitted to the FDA until four years following the date that the reference product was first licensed by the FDA. In addition, the approval of a biosimilar product may not be made effective by the FDA until 12 years from the date on which the reference product was first licensed. During this 12-year period of exclusivity, another company may still market a competing version of the reference product if the FDA approves a full BLA for the competing product containing that applicant’s own preclinical data and data from adequate and well-controlled clinical trials to demonstrate the safety, purity, and potency of its product. The BPCIA also created certain exclusivity periods for biosimilars approved as interchangeable products. The first biologic submitted under the abbreviated approval pathway that is determined to be interchangeable with the reference product is eligible for a period of exclusivity against other biologics submitted under the abbreviated approval pathway during which time the FDA may not determine that another product is interchangeable with the same reference product for any condition of use. The FDA may approve multiple “first” interchangeable products so long as they are all approved on the same first day of marketing. This exclusivity period, which may be shared amongst multiple first interchangeable products, lasts for the lesser of (i) one year after the first commercial marketing, (ii) 18 months after approval if there is no legal challenge, (iii) 18 months after the resolution in the applicant’s favor of a lawsuit challenging the biologic’s patents if an application has been submitted, or (iv) 42 months after the application has been approved if a lawsuit is ongoing within the 42-month period. Products deemed “interchangeable” by the FDA may be readily substituted by pharmacies and such substitution is which are governed by state pharmacy law. The law also includes an extensive process for the innovator biologic and biosimilar manufacturer to litigate patent infringement, validity and enforceability prior to the approval of the biosimilar. Since the passage of the BPCIA, many states have passed laws or amendments to laws, including laws governing pharmacy practices to regulate the use of biosimilars.

Regulation of Companion Diagnostics

We believe that the success of certain of our product candidates may depend, in part, on the development and commercialization of a companion diagnostic. Companion diagnostics identify patients who are most likely to benefit from a particular therapeutic product; identify patients likely to be at increased risk for serious side effects as a result of treatment with a particular therapeutic product; or monitor response to treatment with a particular therapeutic product for the purpose of adjusting treatment to achieve improved safety or effectiveness. Companion diagnostics are regulated as medical devices by the FDA. In the U.S., the FDCA and its implementing regulations, and other federal and state statutes and regulations govern, among other things, medical device design and development, preclinical and clinical testing, premarket clearance or approval, registration and listing, manufacturing, labeling, storage, advertising and promotion, sales and distribution, export and import, and post-market surveillance. Unless an exemption or FDA exercise of enforcement discretion applies, diagnostic tests generally require marketing clearance or approval from the FDA prior to commercialization. The primary types of FDA marketing authorization applicable to a medical device are clearance of a premarket notification, or 510(k), application, grant of a de novo request for classification, or de novo grant, and approval of a premarket approval, or PMA, application.

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To obtain 510(k) clearance for a medical device, or for certain modifications to devices that have received 510(k) clearance, a manufacturer must submit a premarket notification demonstrating that the proposed device is substantially equivalent to a previously cleared 510(k) device or to a preamendment device that was in commercial distribution before May 28, 1976, or a predicate device, for which the FDA has not yet called for the submission of a PMA. In making a determination that the device is substantially equivalent to a predicate device, the FDA compares the proposed device to the predicate device or predicate devices and assesses whether the subject device is comparable to the predicate device or predicate devices with respect to intended use, technology, design and other features which could affect safety and effectiveness. If the FDA determines that the subject device is substantially equivalent to the predicate device or predicate devices, the subject device may be cleared for marketing. The 510(k) premarket notification pathway generally takes from three to twelve months from the date the application is completed, but can take significantly longer.

For novel medical devices that are low to moderate risk and are not substantially equivalent to a predicate device, a manufacturer may request a risk-based classification determination, called a “Request for Evaluation of Automatic Class III Designation,” for the device in accordance with de novo classification process. This procedure allows a de novo requester whose novel device is automatically classified into Class III to request down-classification of its medical device into Class I or Class II on the basis that the device presents low or moderate risk, rather than requiring the submission and approval of a PMA. Under the FDCA, FDA must make a classification determination for the device that is the subject of a de novo request within 120 days of receipt of the request. However, as specified in FDA’s Medical Device User Fee Amendments of 2022, or MDUFA V, commitment letter, the FDA’s goal is to make a decision on most de novo requests within 150 FDA Days, although in practice the FDA’s review may take significantly longer. During the pendency of FDA’s review, the FDA may issue an additional information letter, which places the de novo request on hold and stops the review clock pending receipt of the additional information requested. In the event the de novo requestor does not provide the requested information within 180 calendar days, the FDA will consider the de novo request to be withdrawn.

The FDA may reject the de novo request if it identifies a legally marketed predicate device that would be appropriate for a 510(k) or determines that the device is not low to moderate risk or that General Controls would be inadequate to control the risks and Special Controls cannot be developed. In the event the FDA determines that the data and information submitted demonstrate that General Controls or General and Special Controls are adequate to provide reasonable assurance of safety and effectiveness, the FDA will grant the de novo request and a classification regulation will be established for the device type. When the FDA grants a de novo request for classification, the device is granted marketing authorization and can further serve as a predicate device for a future 510(k) by any person for future devices of that type.

PMA applications must be supported by valid scientific evidence, which typically requires extensive data, including technical, preclinical, clinical and manufacturing data, to demonstrate to the FDA’s satisfaction the safety and effectiveness of the device. For diagnostic tests, a PMA application typically includes data regarding analytical and clinical validation studies. As part of its review of the PMA, the FDA will conduct a pre-approval inspection of the manufacturing facility or facilities to ensure compliance with the Quality System Regulation, or QSR, which requires manufacturers to follow design, testing, control, documentation and other quality assurance procedures. The FDA’s review of an initial PMA application is required by statute to take between six to ten months, although the process typically takes longer, and may require several years to complete. If the FDA evaluations of both the PMA application and the manufacturing facilities are favorable, the FDA will either issue an approval letter or an approvable letter, which usually contains a number of conditions that must be met in order to secure the final approval of the PMA. If the FDA’s evaluation of the PMA or manufacturing facilities is not favorable, the FDA will deny the approval of the PMA or issue a not approvable letter. A not approvable letter will outline the deficiencies in the application and, where practical, will identify what is necessary to make the PMA approvable. Once granted, PMA approval may be withdrawn by the FDA if compliance with post-approval requirements, conditions of approval or other regulatory standards is not maintained or problems are identified following initial marketing.

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On July 31, 2014, the FDA issued a final guidance document addressing the development and approval process for “In Vitro Companion Diagnostic Devices.” According to the guidance document, for novel therapeutic products that depend on the use of a diagnostic test and where the diagnostic device could be essential for the safe and effective use of the corresponding therapeutic product, the premarket application for the companion diagnostic device should be developed and approved or cleared contemporaneously with the therapeutic, although the FDA recognizes that there may be cases when contemporaneous development may not be possible. However, in cases where a drug cannot be used safely or effectively without the companion diagnostic, the FDA’s guidance indicates it will generally not approve the drug without the approval or clearance of the diagnostic device. The FDA also issued a draft guidance in July 2016 setting forth the principles for co-development of an in vitro companion diagnostic device with a therapeutic product. The draft guidance describes principles to guide the development and contemporaneous marketing authorization for the therapeutic product and its corresponding in vitro companion diagnostic.

Once cleared or approved, the companion diagnostic device must adhere to post-marketing requirements including the requirements of the FDA’s quality system regulation, adverse event reporting, recalls and corrections along with product marketing requirements and limitations. Like biological product manufacturers, companion diagnostic manufacturers are subject to unannounced FDA inspections at any time during which the FDA will conduct an audit of the product(s) and the company’s facilities for compliance with its authorities.

Other Regulatory Matters

Manufacturing, sales, promotion and other activities of product candidates following product approval, where applicable, or commercialization are also subject to regulation by numerous regulatory authorities in the U.S. in addition to the FDA, which may include the Centers for Medicare & Medicaid Services, or CMS, other divisions of the Department of Health and Human Services, or HHS, the Department of Justice, the Drug Enforcement Administration, the Consumer Product Safety Commission, the Federal Trade Commission, the Occupational Safety & Health Administration, the Environmental Protection Agency and state and local governments and governmental agencies.

European Union/Rest of World Government Regulation

In addition to regulations in the U.S., we will be subject to a variety of regulations in other jurisdictions governing, among other things, clinical trials and any commercial sales and distribution of our products. The cost of establishing a regulatory compliance system for numerous varying jurisdictions can be very significant. Although many of the issues discussed above with respect to the United States apply similarly in the context of the European Union and in other jurisdictions, the approval process varies between countries and jurisdictions and can involve additional product testing and additional administrative review periods. The time required to obtain approval in other countries and jurisdictions might differ from and be longer than that required to obtain FDA approval. Regulatory approval in one country or jurisdiction does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory approval in one country or jurisdiction may negatively impact the regulatory process in others.

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