10-K

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 001-38915

IDEAYA Biosciences, Inc.

(Exact name of Registrant as specified in its Charter)

5000 Shoreline Court, Suite 300South San Francisco, California 94080

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (650) 443-6209

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

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

Common Stock, $0.0001 par value per share IDYA Nasdaq Global Select 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☒No☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes☐No☒

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. Yes☒No☐

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). Yes☒No☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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 ☐ Smaller reporting company ☐

Emerging growth company ☐

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. ☒

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 Exchange Act). Yes☐No☒

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant, based on the closing price of the shares of common stock on the Nasdaq Global Select Market on June 28, 2024, the last business day of the registrant’s most recently completed second fiscal quarter, of $35.11 per share, was $2.7 billion. Shares of common stock held by each executive officer and director and by each other person who may be deemed to be an affiliate of the registrant, have been excluded from this computation. The determination of affiliate status for this purpose is not necessarily a conclusive determination for other purposes.

As of February 14, 2025, the registrant had 87,537,391 shares of common stock, $0.0001 par value per share, outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement relating to the 2025 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. The proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2024.

TABLE OF CONTENTS

Page

PART I

Item 1. Business 1

Item 1A. Risk Factors 44

Item 1B. Unresolved Staff Comments 104

Item 1C. Cybersecurity 104

Item 2. Properties 105

Item 3. Legal Proceedings 105

Item 4. Mine Safety Disclosures 105

PART II

Item 7A. Quantitative and Qualitative Disclosures About Market Risk 121

Item 8. Financial Statements and Supplementary Data 121

Item 9A. Controls and Procedures 122

Item 9B. Other Information 122

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections 123

PART III

Item 10. Directors, Executive Officers and Corporate Governance 124

Item 11. Executive Compensation 124

Item 14. Principal Accounting Fees and Services 124

PART IV

Item 15. Exhibits, Financial Statement Schedules 125

NOTE REGARDINGFORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical facts contained in this Form 10-K, including statements regarding our future results of operations and financial position, business strategy, prospective products, product approvals, research and development costs, timing and likelihood of success, plans and objectives of management for future operations and future results of anticipated products, are forward-looking statements. These statements involve known and unknown risks, uncertainties and other important 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 the forward-looking statements.

In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “could,” “intend,” “target,” “project,” “contemplate,” “believe,” “estimate,” “predict,” “potential” or “continue” or the negative of these terms or other similar expressions. The forward-looking statements in this Annual Report on Form 10-K are only predictions. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements speak only as of the date of this Annual Report on Form 10-K and are subject to a number of risks, uncertainties and assumptions described under the sections in this Annual Report on Form 10-K entitled “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this Annual Report on Form 10-K. These forward-looking statements are subject to numerous risks, including, without limitation, the following:

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the scope, progress, results and costs of developing our product candidates or any other future product candidates, and conducting preclinical studies and clinical trials, including our darovasertib Phase 2/3 clinical trials, IDE397 Phase 1/2 clinical trials, IDE849 Phase 1 clinical trial, IDE161 Phase 1 clinical trial, IDE705 (GSK101) clinical trial, IDE275 (GSK959) clinical trial, as well as the potential clinical utility and tolerability of our product candidates;

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our clinical and regulatory development plans;

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the scope, progress, results and costs related to the research and development of our precision medicine target and biomarker discovery platform, including costs related to the development of our proprietary libraries and database of tumor genetic information and specific cancer-target dependency networks;

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our expectations about the impact of macroeconomic developments, such as health epidemics or pandemics, macro-economic uncertainties, social unrest, geopolitical hostilities, natural disasters or other catastrophic events, on our business, and operations, including clinical trials, manufacturing suppliers and collaborators, and on our results of operations and financial condition;

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the availability of companion diagnostics for biomarkers associated with our product candidates and any future product candidates, or the cost of coordinating and/or collaborating with certain diagnostic companies for the manufacture and supply of companion diagnostics;

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the timing of and costs involved in obtaining and maintaining regulatory approval (or certification in certain foreign jurisdictions) for any current or future product candidates and companion diagnostics, and any related restrictions, limitations, and/or warnings in the label of an approved product candidate;

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our expectations regarding the potential market size and size of the potential patient populations for darovasertib, IDE397, IDE849, IDE161, IDE705, IDE275, our other product candidates and any future product candidates, if approved for commercial use;

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the timing and amount of any option exercised, milestone, royalty or other payments we may or may not receive pursuant to any current or future collaboration or license agreement, including under the Collaboration, Option and License Agreement with an affiliate of GSK plc, GLAXOSMITHKLINE INTELLECTUAL PROPERTY (NO. 4) LIMITED, or GSK;

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our ability to maintain existing, and establish new, strategic collaborations, licensing or other arrangements and the financial terms of any such agreements, including our Collaboration, Option and License Agreement with GSK, our Clinical Study Collaboration and Supply Agreement with Gilead Sciences, Inc., our Clinical Trial Collaboration and Supply Agreement with MSD International Business GmbH, our Clinical Trial Collaboration and Supply Agreements with Pfizer Inc., our Clinical Trial Collaboration and Supply Agreement with Amgen

Inc., our License Agreement with Novartis, our Option and License Agreement with Cancer Research Technologies Ltd. and the University of Manchester, our Option and License Agreement with Biocytogen Pharmaceuticals (Beijing) Co., Ltd and our License Agreement with Jiangsu Hengrui Pharmaceuticals Co., Ltd.;

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the timing of commencement of future nonclinical studies and clinical trials and research and development programs;

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our ability to acquire, discover, develop and advance product candidates into, and successfully complete, clinical trials;

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our intentions and our ability to establish collaborations and/or partnerships;

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the timing or likelihood of regulatory filings and approvals for our product candidates;

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our commercialization, marketing and manufacturing capabilities and expectations;

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our intentions with respect to the commercialization of our product candidates;

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the pricing and reimbursement of our product candidates, if approved;

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the implementation of our business model and strategic plans for our business, product candidates and technology platforms, including additional indications for which we may pursue;

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the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates, including the projected terms of patent protection;

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our potential involvement in lawsuits in connection with enforcing our intellectual property rights;

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our potential involvement in third party interference, opposition, derivation or similar proceedings with respect to our patent rights and other challenges to our patent rights and patent infringement claims;

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estimates of our expenses, future revenue, capital requirements, our needs for additional financing and our ability to obtain additional capital;

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our future financial performance; and

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developments and projections relating to our competitors and our industry, including competing therapies and procedures, as well as the competitive position of our product candidates.

Moreover, we operate in an evolving environment. New risk factors and uncertainties may emerge from time to time, and it is not possible for management to predict all risk factors and uncertainties.

Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified and some of which are beyond our control, you should not rely on these forward-looking statements as predictions of future events. The events and circumstances reflected in our forward-looking statements may not occur or be achieved, and actual results could differ materially from those projected in the forward-looking statements. We qualify all of our forward-looking statements by these cautionary statements. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances or otherwise.

Summary of Principal Risks Associated with Our Business

Our business is subject to numerous risks and uncertainties, including those described in Part I, Item 1A, “Risk Factors” in this Annual Report on Form 10-K. You should carefully consider these risks and uncertainties when investing in our securities. The principal risks and uncertainties affecting our business include the following:

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We are a clinical-stage biopharmaceutical company with a limited operating history and no products approved for commercial sale. We have incurred significant losses since our inception, and we anticipate that we will

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continue to incur significant losses for the foreseeable future, which, together with our limited operating history, makes it difficult to assess our future viability;

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We are early in our development efforts. Our business is dependent on the successful development of our product candidates, future product candidates, and companion diagnostics for biomarkers associated with our product candidates and future product candidates;

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In connection with the Collaboration, Option and License Agreement with GSK, if GSK terminates any development program under its collaborations with us, whether as a result of our inability to meet milestones or otherwise, any potential revenue from those collaborations will be significantly reduced or non-existent, and our results of operations and financial condition will be materially and adversely affected;

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As an organization, we have never completed a clinical trial, and may be unable to do so for any of our product candidates;

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The successful development of targeted therapeutics, including therapeutics involving direct targeting of an oncogenic pathway and synthetic lethality therapeutics, including our portfolio of synthetic lethality small molecule inhibitors, as well as any related diagnostics, is highly uncertain;

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Preclinical and clinical drug development is a lengthy and expensive process with an uncertain outcome. We may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of any product candidates, which could result in increased costs to us, delay or limit our ability to generate revenue and adversely affect our business, financial condition, results of operations and prospects. Furthermore, results of earlier studies and trials may not be predictive of future trial results;

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We may find it difficult to enroll patients in our clinical trials given the limited number of patients who have the diseases for which our product candidates are being developed. If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected;

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If we are unable to successfully develop molecular diagnostics for biomarkers that enable patient selection and/or that demonstrate drug-target interaction, or experience significant delays in doing so, we may not realize the full commercial potential of our product candidates;

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We rely on third parties for the manufacture of our product candidates for preclinical and clinical development and expect to continue to do so for the foreseeable future. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or products or such quantities at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts;

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We face significant competition in an environment of rapid technological and scientific change, and our failure to effectively compete may prevent us from achieving significant market penetration. Most of our competitors have significantly greater resources than we do and we may not be able to successfully compete;

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If we fail to attract and retain senior management and key scientific and commercial personnel, our business may be materially and adversely affected;

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Our success depends on our ability to obtain and maintain protection for our intellectual property and our proprietary technologies and to avoid infringing the rights of others; and

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Our stock price may be volatile and you may not be able to resell shares of our common stock at or above the price you paid.

PART I

Item 1. Business.

Company Overview

We are a precision medicine oncology company committed to the discovery and development of targeted therapeutics for patient populations selected using molecular diagnostics. Our approach integrates small molecule drug discovery with extensive capabilities in identifying and validating translational biomarkers to develop targeted therapies for select patient populations that are most likely to benefit from these targeted therapies. Our small molecule drug discovery expertise includes discovery and development of small molecule therapeutics. We are applying these capabilities and approach to develop a robust pipeline in precision medicine oncology.

Pipeline – Overview and Program Goals

Our clinical pipeline includes six potential first-in-class clinical-stage product candidates – darovasertib (PKC), IDE397 (MAT2A), IDE849 (DLL3), IDE275 / GSK959 (Werner Helicase), IDE161 (PARG), and IDE705 / GSK101 (Pol Theta Helicase). We own or control all commercial rights of three of these product candidates: darovasertib, IDE397, and IDE161, and own or control all commercial rights outside of greater China for IDE849. We are also advancing several development candidates, including IDE892, a potential best-in-class MTA-cooperative PRMT5 inhibitor for which we are targeting an investigational new drug, or IND, filing in mid-year 2025; IDE034, a potential first-in-class B7H3/PTK7 topoisomerase-I-inhibitor-payload bispecific antibody drug conjugate, or BsADC, program for which we are targeting an IND filing in the second half of 2025; and IDE251, a potential first-in-class KAT6/7 dual inhibitor program for which we are targeting an IND filing in the second half of 2025. We also have multiple earlier-stage preclinical programs. We have established selective, value-accretive collaborations with leading pharmaceutical companies to support our clinical development activities.

(1)Pursuant to Pfizer Agreements

(2)Pursuant to Gilead CSCSA

(3)Pursuant to Hengrui Pharma License Agreement

(4)Pursuant to GSK Collaboration, Option and License Agreement

(5)Pursuant to Merck CTCSA

(6) Pursuant to Biocytogen Option and License Agreement

All data and the status of each program are summarized below as of February 1, 2025, unless otherwise noted.

Darovasertib (GNAQ or GNA11 Mutations)

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Darovasertib (IDE196) is our most advanced clinical-stage product candidate, which we in-licensed from Novartis. Darovasertib is a potent, selective small molecule inhibitor of protein kinase C, or PKC, which we are developing for genetically defined cancers having GNAQ or GNA11 gene mutations. PKC is a protein kinase that functions downstream of the GTPases GNAQ and GNA11.

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We have enrolled over 230 patients as of February 7, 2025, and have opened multiple clinical sites, including international sites, in our potential registration-enabling Phase 2/3 clinical trial, designated as IDE196-002. The purpose of the clinical trial is to evaluate darovasertib in combination with crizotinib, Pfizer’s investigational cMET inhibitor, in patients having metastatic uveal melanoma, or MUM, with human leukocyte antigen-, or HLA-A*02:01 negative, or HLA-A2(-), serotype, as part of a second Clinical Trial Collaboration and Supply Agreement, or the Second Pfizer Agreement, with Pfizer.

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In December 2024, we announced the recommendation of a move-forward dose and the completion of the Part 2a dose optimization for the potential registration-enabling Phase 2/3 trial evaluating the combination of darovasertib and crizotinib in the first-line, or 1L, setting in patients with HLA-A2(-) MUM. We are targeting a median progression free survival, or PFS, readout for the Phase 2/3 registration-enabling trial of the darovasertib and crizotinib combination in 1L HLA-A2-negative MUM by year-end 2025.

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We are enrolling additional HLA-A*02:01 positive, or HLA-A2(+), patients as an independent clinical strategy to address HLA-A2(+) MUM patients, in our ongoing Phase 2 clinical trial, designated as IDE196-001.

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We are targeting a median overall survival, or OS, readout from our Phase 2 clinical trial, designated as IDE196-001, in approximately 40 1L MUM patients in 2025.

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In September 2024, we announced interim clinical data from the ongoing Phase 2 Company-sponsored trial and provided a regulatory update on a potential Phase 3 registration-enabling clinical trial in neoadjuvant UM patients based on a Type C meeting held with the U.S. Food and Drug Administration, or FDA. Based on the FDA meeting, we currently project approximately 400 patients will be randomized for treatment with darovasertib in the treatment arm or the control arm, with potential modifications pending further feedback from the FDA. We are currently finalizing the trial protocol for neoadjuvant UM and are targeting to initiate the study in the first half of 2025.

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We are also supporting evaluation of darovasertib as single-agent neoadjuvant and adjuvant therapy in primary UM in an ongoing investigator-sponsored clinical trial, or IST, captioned as “Neoadjuvant / Adjuvant trial of Darovasertib in Ocular Melanoma,” or NADOM, led by St. Vincent’s Hospital in Sydney with the participation of Alfred Health and the Royal Victorian Eye and Ear Hospital in Melbourne.

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In June 2024, we announced interim clinical data from the ongoing investigator-sponsored Phase 2 trial of darovasertib as neoadjuvant/adjuvant treatment in UM, which was included in an oral presentation at the American Society of Clinical Oncology, or ASCO, 2024 Annual Meeting, and preliminary clinical data from our Phase 2 trial of darovasertib for neoadjuvant UM.

IDE397 (MTAP Gene Deletion)

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IDE397, our small molecule methionine adenosyltransferase 2a, or MAT2A, inhibitor, is being evaluated in a Phase 1/2 clinical trial. We have selected a move-forward Phase 2 expansion dose for IDE397 monotherapy, based on adverse event, or AE, profile and preliminary clinical efficacy observed, including multiple partial responses by RECIST 1. We are enrolling patients with an initial focus in MTAP-deletion urothelial cancer, or UC, and non-small cell lung cancer, or NSCLC.

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In July 2024, we announced clinical data for the IDE397 Phase 2 monotherapy expansion dose demonstrating preliminary clinical efficacy in heavily pre-treated MTAP-deletion UC and NSCLC patients.

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We are collaborating with Gilead Sciences, Inc., or Gilead, to clinically evaluate IDE397 in combination with Trodelvy (sacituzumab-govitecan-hziy), Gilead’s Trop-2 directed antibody drug conjugate, or ADC, in patients having MTAP-deletion UC, in our Phase 1 clinical trial pursuant to a Clinical Study Collaboration and Supply Agreement, or Gilead CSCSA, with Gilead. A first patient was dosed for the Phase 1 trial in June 2024.

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In October 2024, we reported the first preliminary clinical case study of the IDE397 and Trodelvy combination in MTAP-deletion UC at ENA 2024, including a partial response by RECIST 1.1 in a patient case report with a genetic co-alteration of MTAP-deletion and a FGFR3-TACC3 fusion, and rapid and deep first-evaluation molecular responses, or MRs, with ctDNA reduction of greater than 95% observed. The partial response reported at ENA 2024 has confirmed by RECIST 1.1. We are targeting a Phase 1/2 expansion in the first quarter of 2025 and a clinical data update for the Phase 1 trial in MTAP-deletion UC in 2025.

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In February 2025, we expanded our clinical study collaboration and entered into a Clinical Study Collaboration and Supply Agreement, or the Second Gilead CSCSA, to evaluate the IDE397 and Trodelvy combination in MTAP-deletion NSCLC.

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We were collaborating with Amgen to clinically evaluate IDE397 in combination with AMG 193, the Amgen investigational MTA-cooperative PRMT5 inhibitor, in patients having tumors with MTAP-deletion, in an Amgen-sponsored clinical trial pursuant to our Clinical Trial Collaboration and Supply Agreement with Amgen, or the Amgen CTCSA. We and Amgen mutually agreed to wind down the IDE397 and AMG 193 clinical combination study in February 2025 and will not pursue dose expansion.

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In October 2024, we presented a preclinical poster presentation on the antitumor activity by combinatorial inhibition of MAT2A and PRMT5 in MTAP-deleted tumors at the EORTC-NCI-AACR Symposium, or ENA 2024. We are targeting to enable our wholly-owned clinical combination of IDE397 and IDE892, our potential best-in-class MTA-cooperative PRMT5 inhibitor development candidate, in the second half of 2025 in MTAP-deletion NSCLC.

IDE849 / SHR-4849 (DLL3 ADC program)

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In December 2024, we entered into an exclusive License Agreement, or the Hengrui Pharma License Agreement, with Jiangsu Hengrui Pharmaceuticals Co., Ltd., or Hengrui Pharma, pursuant to which Hengrui Pharma granted us an exclusive worldwide license outside of Greater China for IDE849 (SHR-4849), a potential first-in-class Phase 1 DLL3 TOP1i ADC. Under the terms of the Hengrui Pharma License Agreement, Hengrui Pharma is eligible to receive upfront and milestone payments totaling $1.045 billion, including a $75.0 million upfront fee, up to $200.0 million in development and regulatory milestone payments, plus commercial success-based milestones. Hengrui Pharma is also eligible to receive mid-single to low-double digit royalties on net sales outside of Greater China.

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IDE849 is currently being evaluated by Hengrui Pharma in an ongoing Phase 1 trial in China in small cell lung cancer, or SCLC, patients. In preliminary results from the trial, 8 out of 11 evaluable patients achieved partial response by RECIST 1.1. In January 2025, Hengrui Pharma selected expansion doses for the Phase 1 trial.

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We are planning on submitting a U.S. IND for the evaluation of IDE849 as a monotherapy in SCLC in the first half of 2025. We are also targeting to initiate the evaluation of IDE849 in combination with IDE161 and in neuroendocrine tumors, or NETs in the second half of 2025. A clinical data update is targeted in 2025.

IDE275 / GSK959 (WRN Program - High Microsatellite Instability)

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In October 2024, GSK initiated a Phase 1 clinical trial for IDE275 (GSK959), following the submission of the GSK-sponsored IND and FDA allowance to proceed with the clinical trial. IDE275 (GSK959) targets the helicase domain of the Werner, or WRN, protein, for patients having tumors with high microsatellite instability, or MSI-High. GSK will lead clinical development for the Werner Helicase program.

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We earned a $7.0 million milestone payment for the IND clearance of IDE275 (GSK959) in October 2024. We previously earned an earlier milestone of $3.0 million in October 2023 in connection with IND-enabling studies. We have the potential to earn up to an additional $10.0 million milestone payment upon initiation of Phase 1 clinical dose expansion.

IDE161 (HRD, including BRCA)

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IDE161 is our potential first-in-class, small molecule poly (ADP-ribose) glycohydrolase, or PARG, inhibitor. We are progressing with enrollment of patients having tumors with homologous recombination deficiency, or HRD, into the Phase 1 expansion portion of the Phase 1/2 clinical trial. We selected an initial Phase 1/2 monotherapy expansion dose for IDE161 in endometrial cancer, based on AE profile and preliminary efficacy observed. In parallel, we are also continuing with Phase 1 dose optimization to confirm a move-forward expansion dose for the planned Phase 2 portion of the clinical trial.

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In March 2024, we entered into a Clinical Trial Collaboration and Supply Agreement, or the Merck CTCSA, with Merck (known as MSD outside of the United States and Canada). We are evaluating IDE161 in combination with Merck's anti-PD-1 therapy, KEYTRUDA® (pembrolizumab), in patients with MSI-High, and microsatellite stable, or MSS, endometrial cancer.

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In December 2024, the first patient was dosed with IDE161 in combination with KEYTRUDA in the Company-sponsored Phase 1 clinical trial. We are targeting a Phase 1 expansion in MSI-High and MSS endometrial cancer in 2025.

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In October 2024, we presented preclinical results on the IDE161 and ADC combination rationale as a poster at ENA 2024. We are targeting clinical combination(s) of IDE161 with TOP1i-ADCs in solid tumors in 2025.

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We received Fast Track Designations from the FDA in September 2023 for IDE161, specifically for the treatment of (i) adult, pretreated, platinum-resistant advanced or metastatic ovarian cancer patients having tumors with BRCA1/2 mutations and (ii) adult, pretreated, advanced or metastatic hormone receptor positive, or HR+, Her2- and BRCA1/2 mutant breast cancer patients.

IDE705 / GSK101 (Pol Theta Program - HR mutations, including BRCA, or HRD)

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Enrollment is ongoing in the Phase 1 dose escalation portion of the GSK-sponsored study. IDE705 (GSK101) targets the helicase domain of the Pol Theta protein for patients having solid tumors with BRCA or other mutations associated with HRD. GSK is leading clinical development of IDE705 (GSK101). GSK is clinically evaluating IDE705(GSK101) in a GSK-sponsored dose escalation trial in combination with niraparib, the GSK small molecule inhibitor of poly-(ADP-ribose) polymerase, or PARP, in solid tumors.

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In August 2023, we earned a $7.0 million payment for a milestone based on acceptance of the IND by the FDA. An earlier preclinical development $3.0 million milestone payment from GSK was achieved in August 2022 in connection with ongoing IND-enabling studies to support the evaluation of IDE705 (GSK101).

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We have the potential to receive an additional $10.0 million milestone payment upon initiation of Phase 1 clinical dose expansion.

IDE892 (MTA-cooperative PMRT5 inhibitor)

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In December 2024, we selected IDE892, a potential best-in-class MTA-cooperative PRMT5 inhibitor, as a development candidate. IDE892 is a potent and selective MTA-cooperative PRMT5 inhibitor with favorable ADME properties, demonstrating robust MTAP deletion-specific pathway suppression and highly durable antitumor activity in combination with IDE397 IND-enabling studies.

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Subject to successful completion of ongoing IND-enabling studies for IDE892, we are targeting an IND submission in mid-year 2025. We are also targeting to enable our wholly-owned clinical combination of IDE397 and IDE892 in the second half of 2025 in MTAP-deletion NSCLC.

IDE034 (B7H3 / PTK7 BsADC program)

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In July 2024, we entered into an Option and License Agreement, or the Biocytogen Option and License Agreement, with Biocytogen Pharmaceuticals (Beijing) Co., Ltd., (Biocytogen, HKEX: 02315), or Biocytogen, pursuant to which Biocytogen granted us an option for an exclusive worldwide license for a potential first-in-class B7H3/PTK7 topoisomerase-I-inhibitor-payload bispecific antibody drug conjugate, or BsADC, program, or the Option.

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In November 2024, we announced the selection of IDE034, a potential first-in-class B7H3/PTK7 topo-I-payload BsADC, as a development candidate and the exercise of the Option. Pursuant to the Biocytogen Option and License Agreement, we paid Biocytogen an upfront fee and exercise fee for the Option totaling $6.5 million.

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Subject to the successful completion of ongoing IND-enabling studies for IDE034, we are targeting an IND submission in the second half of 2025.

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Biocytogen is eligible to receive total potential upfront, option exercise and milestone payments equal an aggregate of $406.5 million, including development and regulatory milestones of $100.0 million.

IDE251 (KAT6/7 inhibitor)

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In December 2024, we selected IDE251, a potential first-in-class KAT6/7 inhibitor, as a development candidate. IDE251 is an equipotent, highly selective, small molecule dual inhibitor of the lysine acetyltransferase (KAT) 6 and 7, both of which have been shown to support cancer cell survival.

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Subject to the successful completion of ongoing IND-enabling studies for IDE251, we are targeting an IND submission in the second half of 2025.

Precision Medicine Research Platform

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We have established a robust precision medicine research platform with capabilities for identification and validation of new targets and biomarkers, drug discovery and translational biology. Our approach integrates small molecule drug discovery with extensive capabilities in identifying and validating translational biomarkers to develop targeted therapies for select patient populations that are most likely to benefit from these targeted therapies.

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We own or control all commercial rights in programs directed to targets identified in on our new target and biomarker discovery platform.

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Other Pipeline Programs (Defined Biomarkers)

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We own or control all commercial rights in our next-generation programs.

New Target and Biomarker Discovery Platform

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We have invested significantly and continue to invest in capabilities for identification and validation of new precision medicine targets and biomarkers for patient selection. For targets of interest, we advance our research to discover therapeutic drugs and to further qualify relevant biomarkers.

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We own or control all commercial rights in programs directed to targets identified in on our new target and biomarker discovery platform.

Scientific Rationale – Synthetic Lethality

Synthetic lethality is emerging as an important therapeutic paradigm in the treatment of cancer. It was first defined by Calvin Bridges in 1922 based on the observation that certain combinations of gene mutations resulted in lethality despite the fact the single mutations in either gene were viable.

Cancer cells often contain genetic changes that lead to alterations in pathways such as DNA repair and metabolism. These changes endow the cancer cells with certain properties such as the ability to replicate by bypassing normal control mechanisms. However, removing these important regulators of cell function may also make these cancer cells more dependent on backup pathways that can then be targeted to achieve a therapeutic effect. We are using small molecule inhibitors against targets in DNA damage repair, or DDR, pathways or in tumor metabolism pathways, that have potentially less effects on the viability of normal cells, but are designed to result in lethality in cancer cells having specific underlying genetic alterations. Cancer targets based on synthetic lethality are ideal for precision medicine approaches because each product candidate inherently has a tumor-associated genetic biomarker to facilitate patient selection.

Darovasertib – PKC Inhibitor Clinical Candidate in Uveal Melanoma

Darovasertib (IDE196) is our most advanced clinical-stage product candidate, which we in-licensed from Novartis. Darovasertib is a potent, selective small molecule inhibitor of PKC, which we are developing for genetically defined cancers having GNAQ or GNA11 gene mutations. PKC is a protein kinase that functions downstream of the GTPases GNAQ and GNA11.

We have enrolled over 230 patients as of February 7, 2025 and have opened multiple clinical sites, including international sites, in our potential registration-enabling Phase 2/3 clinical trial, designated as IDE196-002. The purpose of the clinical trial is to evaluate darovasertib in combination with crizotinib, Pfizer’s investigational cMET inhibitor, in patients having MUM with human leukocyte antigen-, or HLA-A*02:01 negative, or HLA-A2(-), serotype, as part of the Second Pfizer Agreement with Pfizer.

We are targeting a median OS readout from our Phase 2 clinical trial, designated as IDE196-001, in approximately 40 1L MUM patients in 2025.

We are also supporting evaluation of darovasertib as single-agent neoadjuvant and adjuvant therapy in primary UM in an IST, captioned as “Neoadjuvant / Adjuvant trial of Darovasertib in Ocular Melanoma,” or NADOM, led by St. Vincent’s Hospital in Sydney with the participation of Alfred Health and the Royal Victorian Eye and Ear Hospital in Melbourne.

We have enrolled 95 patients as of December 31, 2024 in our Phase 2 clinical trial, designated as IDE196-009, evaluating darovasertib as single-agent neoadjuvant and adjuvant therapy in patients having primary UM with ongoing enrollment and multiple clinical sites open. In September 2024, we announced interim clinical data from the ongoing Phase 2 Company-sponsored trial and provided a regulatory update on a registrational trial based on a Type C meeting held with the FDA.

ASCO 2024 Clinical Data from Investigator-Sponsored Phase 2 Trial

In our ongoing investigator-sponsored Phase 2 trial of darovasertib as neoadjuvant/adjuvant treatment in UM, 15 patients planned for enucleation with localized UM were treated twice daily with a 300 mg dose of darovasertib in the Phase 2 investigator-sponsored clinical trial as of May 14, 2024. An initial safety cohort of three patients was treated for one month, and the remaining 12 patients were treated in an expansion cohort for up to six months with darovasertib as neoadjuvant treatment prior to their primary intervention (enucleation, plaque brachytherapy or external beam radiotherapy, or EBRT) across three Australian centers. As of May 14, 2024, 13 patients had completed neoadjuvant darovasertib treatment, 11 patients received adjuvant darovasertib treatment after primary treatment of UM, with five patients completing the planned six months of therapy. As of May 14, 2024, 75% (nine out of 12 enucleation patients) had confirmed preservation of the eye, by conversion from planned enucleation to plaque brachytherapy or EBRT, and approximately 67% (eight out of 12 enucleation patients) observed greater than 30% tumor shrinkage (maximum tumor volume change) after six months. Median tumor shrinkage (maximum tumor volume change) in the 12 enucleation patients was approximately 47% after six months. The darovasertib monotherapy neoadjuvant treatment had a manageable AE profile with no drug-related serious adverse events, or SAEs, observed in the investigator-sponsored Phase 2 trial. Drug-related AEs in the trial were predominantly Grade 1 or Grade 2, and 20% of patients reported at least one drug-related Grade 3 AE.

Company-Sponsored Phase 2 Trial

In September 2024, we provided a clinical data update in which we observed encouraging clinical activity in our Phase 2 Company-sponsored trial. Collectively with the IST trial, the clinical efficacy data from the Phase 2 Company-sponsored trial substantiate clinical proof of concept for the use of darovasertib in the neoadjuvant uveal melanoma setting. The Phase 2 Company-sponsored trial used a data cutoff date of August 15, 2024, with an enrollment cutoff date of May 13, 2024.

We evaluated 31 enucleation and 18 plaque brachytherapy UM patients who were treated with darovasertib neoadjuvant therapy in the Phase 2 Company-sponsored and IST trials. We observed approximately 59%, or 29 of the 49 total evaluable patients, with greater than or equal to 20% ocular tumor shrinkage by product of diameters and approximately 49%, or 24 of the 49 total evaluable patients, with greater than or equal to 30% ocular tumor shrinkage by product of diameters. We also observed an approximately 61% eye preservation rate in enucleation patients. We found evidence predicting visual preservation by reducing the amount of radiation associated with plaque brachytherapy. We observed a manageable AE profile from the Phase 2 Company-sponsored trial. In 38 patients, 11% of patients experienced a Grade 3 or higher AE and 5% of patients experienced a serious AE rate. We also observed a discontinuation rate of 3%. The most common AEs observed included diarrhea, nausea, vomiting and fatigue.

We are pursuing a clinical strategy for darovasertib to broadly address UM, alternatively referred to as ocular melanoma, in both primary and metastatic settings. Greater than 90% of UM patients have tumors harboring GNAQ or GNA11 mutations. There are no FDA-approved systemic therapies for primary UM, as either neoadjuvant or adjuvant therapies. There are likewise no FDA-approved therapies for patients having MUM with HLA-A*02:01 negative, or HLA-A2(-), serotype. These primary UM patients and HLA-A2(-) MUM patients collectively represent approximately 85% of all ocular melanoma patients. We have a separate, independent clinical strategy to address HLA-A*02:01 positive, or HLA-A2(+), MUM patients.

The potentially addressable patient population for MUM is estimated to include an annual incidence of approximately 4,500 patients across the United States and Europe. (Neo)Adjuvant UM represents a significant expansion opportunity for darovasertib – with a potential annual incidence of approximately 12,000 patients aggregate in North America, Europe and Australia.

We own or control all commercial rights in our darovasertib program in UM, including in MUM and in primary UM, subject to certain economic obligations pursuant to our exclusive, worldwide license to darovasertib with Novartis.

Darovasertib – Potential Registration-Enabling Clinical Trial in First-Line HLA-A2(-) MUM

The protocol of the Phase 2/3 clinical trial design incorporates guidance and feedback following our Type C meeting with the FDA in March 2023. This protocol includes an integrated Phase 2/3 open-label study-in-study design in first-line MUM patients with an HLA-A2(-) serotype. The clinical trial design employs a Phase 2 portion with median progression free survival, or PFS, as a primary endpoint for potential accelerated approval. Patients enrolled in Phase 2 will continue on treatment within the same study and will be considered, together with additional enrolled patients, to evaluate OS as the primary endpoint of the Phase 3 confirmatory portion of the clinical trial to support a potential full approval.

In the Phase 2 portion of the clinical trial, approximately 230 patients will be randomized on a 2:1 basis for treatment with the darovasertib and crizotinib combination in the treatment arm or investigators choice in the control arm, selected from (a) a combination of ipilimumab (ipi) and nivolumab (nivo), (b) PD1-targeted monotherapy or (c) dacarbazine. The treatment arm of the Phase 2 portion of the clinical trial includes a nested study to confirm the move forward combination dose for the integrated Phase 2/3 clinical trial – including cohorts at the Phase 2 expansion doses of (i) darovasertib 300 mg BID + crizotinib 200 mg BID and (ii) darovasertib 200 mg BID + crizotinib 200 mg BID. Under the nested study design, patients enrolled in the cohort at the move forward dose will be included within the Phase 2/3 registrational clinical trial. The Phase 2 portion of the clinical trial contemplates an efficacy and safety data set of approximately 200 patients randomized 2:1 with the treatment arm at the move forward dose to support a potential accelerated approval based on median PFS by blinded independent central review, or BICR, as a primary endpoint. Accelerated approval is intended to allow for earlier approval of drugs that treat serious conditions and fill an unmet medical need based on a demonstration of effectiveness on a surrogate endpoint.

Patients enrolled in Phase 2 at the selected dose would continue on treatment and be included in the Phase 3 study analysis, supplemented by enrollment of approximately 120 additional patients into the Phase 3 portion of the clinical trial, with 2:1 randomization on the same basis as the Phase 2 portion. Efficacy data from the Phase 3 could support potential full approval using median OS as a primary endpoint.

In May 2023, we expanded our relationship with Pfizer to support the Phase 2/3 registrational trial to evaluate darovasertib and crizotinib as a combination therapy in MUM by entering into Amendment No. 1 to the Second Pfizer Agreement. Under Amendment No. 1 to the Second Pfizer Agreement, Pfizer will provide us with a first defined quantity of crizotinib at no cost, as well as an additional second defined quantity of crizotinib at a lump-sum cost.

Prevalence of HLA-A2*02:01 Negative Serotype in MUM

Data from darovasertib clinical trials in MUM demonstrate that approximately 70% of MUM patients with known HLA-A*02:01, or HLA-A2 status were HLA-A2(-). As reported at ESMO 2023, the HLA-A2 status was known in subsets of patients enrolled in clinical trials evaluating darovasertib. Prevalence of HLA-A2(+) and HLA-A2(-) in MUM patients was determined from a first data set of n=149 MUM patients treated with darovasertib as monotherapy or in a combination arm of a clinical trial, and separately in a second data set of n=118 MUM patients treated with the darovasertib and crizotinib combination. These data include 102 of 149 (68%) of patients in the all-treatment subset and 81 of 118 (69%) patients in the darovasertib and crizotinib combination treatment subset.

Darovasertib – Strategy for HLA-A*02:01 Positive MUM

Based on clinical data from the Phase 2 clinical trial evaluating darovasertib and crizotinib in MUM as reported at ESMO 2023, and based on the darovasertib mechanism of action, we anticipate darovasertib will have clinical activity independent of HLA-A2 status in GNAQ/11-mutation cancers.

We are enrolling additional HLA-A2(+) MUM patients as an independent clinical strategy to address HLA-A2(+) MUM patients, in our ongoing Phase 2 clinical trial, designated as IDE196-001. This strategy demonstrates our commitment to fully address the high unmet medical need in MUM. Such clinical trial data from darovasertib and crizotinib combination treatment in HLA-A2(+) MUM could support publication and potential inclusion in NCCN Clinical Practice Guidelines in Oncology.

Darovasertib – Orphan Drug Designation in UM and Fast Track Designation in MUM

In April 2022, the FDA designated darovasertib as an Orphan Drug in UM, including primary and metastatic disease. Under an Orphan Drug designation, darovasertib may be entitled to certain tax credits for qualifying clinical trial expenses, exemption from certain user fees and, subject to FDA approval of a New Drug Application, or NDA, for darovasertib in UM, eligibility for seven years of statutory marketing exclusivity during which the FDA is prohibited from approving a subsequent same drug for the same rare disease or condition except in limited circumstances, such as a subsequent drug that demonstrates clinical superiority. As an FDA-designated Orphan Drug, darovasertib may also be excluded from certain mandatory price negotiation provisions of the 2022 Inflation Reduction Act, if approved for a single indication only.

In November 2022, the FDA granted Fast Track designation to our development program investigating darovasertib in combination with crizotinib in adult patients being treated for MUM. The Fast Track designation makes our darovasertib and crizotinib development program eligible for various expedited regulatory review processes, including generally more frequent FDA interactions, such as meetings and written communications, potential eligibility for rolling review of a future NDA and potential accelerated approval and priority review of an NDA.

Darovasertib – Phase 2 Trials in Neoadjuvant and Adjuvant Therapy in Uveal Melanoma (UM)

We are clinically evaluating the potential for darovasertib as neoadjuvant or adjuvant therapy, or both, also referred to as (neo)adjuvant therapy, in primary, non-metastatic UM patients. We previously reported preliminary clinical data in the neoadjuvant setting showing evidence of anti-tumor activity that we believe supports further clinical evaluation of darovasertib to determine its potential as a neoadjuvant therapy to either save the eye by avoiding enucleation, or to reduce the tumor thickness in the eye, enabling treatment with less radiation to preserve vision, and as an adjuvant therapy, to potentially extend relapse free survival.

We have enrolled 95 patients as of December 31, 2024 in our Phase 2 clinical trial, designated as IDE196-009, evaluating darovasertib as single-agent neoadjuvant and adjuvant therapy in patients having primary UM with ongoing enrollment and multiple clinical sites open. The purpose of the clinical trial is to evaluate single-agent darovasertib as neoadjuvant treatment of primary UM prior to primary interventional treatment of enucleation or radiation therapy and also as adjuvant therapy following the primary treatment. An amendment to the study protocol was submitted to the FDA in July 2024 to enable dosing of darovasertib therapy up to 12 months.

We are additionally supporting evaluation of darovasertib as (neo)adjuvant therapy in primary UM in the ongoing NADOM IST. Pursuant to an as-amended protocol for

the NADOM study, UM patients who would otherwise undergo enucleation are instead treated with single agent darovasertib as neoadjuvant treatment for up to six months or maximum benefit. This reflects an increase in potential treatment duration versus the initial approach of one month neoadjuvant therapy, following which these patients will undergo a primary interventional treatment. Patients will subsequently be treated with darovasertib for up to six months as follow-up adjuvant therapy after the primary interventional treatment.

Darovasertib – Potential Registration-Enabling Clinical Trial in Neoadjuvant UM

A Type C meeting was held with the FDA for the clinical trial design of a potential Phase 3 registration-enabling clinical trial in neoadjuvant UM patients. For the potential Phase 3 clinical trial, we currently project approximately 400 patients will be randomized for treatment with darovasertib in the treatment arm or the control arm, with potential modifications pending further feedback from the FDA. Based on the currently targeted clinical trial design, there will be two cohorts enrolled, including plaque brachytherapy eligible UM patients and enucleation eligible UM patients. For the plaque brachytherapy cohort, the randomization will be darovasertib followed by plaque brachytherapy versus plaque brachytherapy alone. For the enucleation cohort, the randomization will be with or without darovasertib as neoadjuvant therapy.

Based on FDA guidance and information provided in our FDA briefing book, we expect that time to vision loss will be the primary endpoint for plaque brachytherapy UM patients. Eye preservation rate will be the primary endpoint for enucleation UM patients for the target registrational trial design in neoadjuvant UM. The FDA briefing book noted an objective to exceed lower bound of 10% eye preservation rate with a 95% confidence interval for this primary endpoint. No detriment to Event-Free-Survival, or EFS, in the treatment arms will be a secondary endpoint.

Pending ongoing discussions with the FDA, we are evaluating potential surrogate and composite endpoints to support earlier approval scenarios. The registrational study will enroll UM patients with a high risk for metastatic disease. Based on the FDA meeting, there is a potential for consideration of a broad indication label in neoadjuvant UM for subjects with low, intermediate and high risk for metastatic disease. We anticipate approximately two years of data maturity to initial readout for no detriment to EFS in the treatment arms for this high-risk patient population based on preliminary projections. 300mg BID darovasertib was noted in the FDA briefing book as the move-forward dose for the registrational trial. We are currently finalizing the trial protocol and are targeting to initiate the study in the first half of 2025.

IDE397– MAT2A Inhibitor in Tumors with MTAP Deletion

IDE397 is a clinical-stage, potent, selective small molecule inhibitor of methionine adenosyltransferase 2a, or MAT2A, which we are developing for patients having solid tumors with MTAP deletion. The prevalence of methylthioadenosine phosphorylase, or MTAP, gene deletion is estimated to be approximately 15% of human solid tumors. MTAP deletion in patient tumors is identified by commercial or institutional next generation sequencing, or NGS, panels or by MTAP immunohistochemistry, or IHC, assay with confirmation by NGS.

MTAP-null cells lack the ability to metabolize 5-methylthioadenosine, or MTA, which is an essential step in a biochemical pathway involved in salvaging the metabolite S-adenosyl methionine, or SAM. Increased levels of MTA partially inhibit the methyltransferase PRMT5 for which SAM is the methyl-donor substrate for methylation of various proteins. This partial inhibition of PRMT5 by increased levels of MTA renders MTAP-null cells more dependent on the activity of MAT2A, an enzyme that is responsible for the synthesis of SAM. Because of this enhanced dependence, loss of MTAP results in synthetic lethality when MAT2A is pharmacologically inhibited.

We are enrolling patients into a Phase 1/2 clinical trial, designated as IDE397-001, to evaluate IDE397 for patients having certain tumors with MTAP gene deletion. We are proceeding with enrollment of MTAP-deletion patients into a monotherapy Phase 1/2 expansion cohort with an initial focus on high priority solid tumor types, including UC and NSCLC. We have selected a move-forward Phase 2 expansion dose for IDE397 monotherapy in MTAP-deletion UC and NSCLC, based on AE profile and preliminary clinical efficacy observed, including multiple partial responses by RECIST 1.1.

Company-Sponsored Phase 1/2 Monotherapy Expansion in MTAP-Deletion Urothelial and Lung Cancer

In July 2024, we announced clinical data for the IDE397 Phase 1/2 monotherapy expansion dose demonstrating preliminary clinical efficacy in heavily pre-treated MTAP-deletion UC and NSCLC patients. The patients evaluated had a median of two prior lines of therapy, ranging from one to seven prior lines of treatment. The reported Phase 1/2 clinical data were based on 18 evaluable MTAP-deletion patients, including seven UC patients, four adenocarcinoma squamous NSCLC patients, and seven squamous NSCLC patients at the expansion dose of 30 mg once-a-day, or QD, of IDE397. In the interim update for 18 evaluable patients, with a data analysis cutoff date of June 21, 2024, we reported an overall response rate of approximately 39% (one complete response and six partial responses by RECIST 1.1 evaluation), which included two unconfirmed partial responses (one UC patient that had a 100% tumor reduction in the target lesion at the last CT-scan assessment and one adenocarcinoma squamous NSCLC patient which were both confirmed in our October 2024 update). We also observed a disease control rate of 94%, including one complete response, six partial responses and ten stable disease by RECIST 1.1 evaluation. In addition, we observed tumor shrinkage in 14 of the 18 evaluable patients. 11 of the evaluable patients are still on treatment and five of the seven responses by RECIST 1.1 evaluation remain in response. We also reported a ctDNA molecular response, or MR, rate of 81%, representing 13 of 16 reportable patients with 50% or greater ctDNA reduction (several quality control failures of patient samples precluded the other patients from MR analysis).

Regarding safety data, we also reported a favorable AE profile at the 30 mg QD expansion dose. Approximately 5.6% of patients experienced a Grade 3 or higher drug-related AE at the 30 mg QD dose, represented by one instance of Grade 3 asthenia, and no drug-related SAEs were observed. We observed no drug-related AEs leading to discontinuations, and one non-evaluable patient discontinued due to rapid clinical progression of cancer fatigue and drug-unrelated AEs in the first cycle of treatment. We anticipate that the favorable AE profile and dosing convenience of a 30 mg QD tablet has the potential to enable long-term dosing and combination development.

In October 2024, we announced Phase 1 expansion data for IDE397 in MTAP-deletion UC and NSCLC patients in a late breaker abstract oral presentation at the 36th edition of the EORTC-NCI-AACR Symposium, or ENA 2024, in Barcelona, Spain. The patients evaluated had a median of two to three prior lines of therapy, ranging from one to seven prior lines of treatment. The reported clinical data were based on 27 evaluable MTAP-deletion patients, including 10 UC patients, nine adenocarcinoma NSCLC patients, and eight squamous NSCLC patients at the expansion dose of 30 mg QD of IDE397. In the update of 27 evaluable patients, with a data analysis cutoff date of August 22, 2024, we reported an overall response rate of approximately 33% (one complete response and eight partial responses by RECIST 1.1 evaluation). Nine of nine responses were confirmed by RECIST 1.1, including four UC patients, of which one was a complete response, three squamous NSCLC patients, and two adenocarcinoma NSCLC patients. Two patients were confirmed after the data cutoff date. We also observed an overall response rate by RECIST 1.1 evaluation by solid tumor type. For MTAP-deletion UC patients, the confirmed overall response rate was 40%, or 4 out of 10 patients, for MTAP-deletion squamous NSCLC patients, the confirmed overall response rate was approximately 38%, or 3 out of 8 patients, and for MTAP-deletion adenocarcinoma NSCLC patients, the confirmed overall response rate was approximately 22%, or 2 out of 9 patients. In addition, we observed a disease control rate of 93%, including one complete response, eight partial responses and 16 stable disease by RECIST 1.1 evaluation, reflecting 25 of 27 evaluable patients with stable disease or better. Of the 27 evaluable patients, 15 are still on treatment. The median duration of treatment has not been reached and is greater than 6.2 months. The median time to response is approximately 2.7 months. The median duration of response and median progression free survival data is still immature. Three UC patients were on treatment greater than 250 days, four squamous NSCLC patients were on treatment greater than 200 days, and three adenocarcinoma NSCLC patients were on treatment greater than 200 days. We also reported a ctDNA MR rate of 81%, representing 17 of 21 reportable patients with 50% or greater ctDNA reduction and approximately 33%, representing 7 of 21 reportable patients, with a deep 90% or greater ctDNA reduction (several quality control failures of patient samples precluded the other patients from MR analysis). All 17 MRs were rapid occurring at the first ctDNA sample analysis.

We continued to report favorable AE profile at the 30 mg QD expansion dose. Approximately 18% of patients experienced a Grade 3 or higher drug-related AE at the 30 mg QD dose, and no drug-related SAEs were observed. No drug-related AEs leading to discontinuations were observed. We anticipate that the favorable AE profile and dosing convenience of a 30 mg QD tablet has the potential to enable long-term dosing and combination development, including with MTA-cooperative PRMT5 inhibitors and topoisomerase payload ADCs.

We are collaborating with Gilead to clinically evaluate IDE397 and Trodelvy (sacituzumab-govitecan-hziy), Gilead’s Trop-2 directed ADC combination, in patients having MTAP-deletion UC, in our Phase 1 clinical trial pursuant to the Gilead CSCSA, with Gilead.

A first patient was dosed for the Phase 1 trial in June 2024. The Phase 1 clinical trial is evaluating the safety, tolerability, pharmacokinetics, pharmacodynamics and efficacy of IDE397 in combination with Trodelvy in MTAP-deletion UC patients (NCT04794699). Pursuant to the Gilead CSCSA, we and Gilead retain the commercial rights to our respective compounds, including with respect to use as a monotherapy or combination agent. We are the study sponsor and Gilead will provide the supply of Trodelvy. IDE397 monotherapy or in combination with Trodelvy has not been approved by any regulatory agency, and the efficacy and safety of this combination has not been established.

In October 2024, we reported the first preliminary clinical case study of the IDE397 and Trodelvy combination in MTAP-deletion UC at ENA 2024, including a partial response by RECIST 1.1 in a patient case report with a genetic co-alteration of MTAP-deletion and a FGFR3-TACC3 fusion, and rapid and deep first-evaluation MRs with ctDNA reduction of greater than 95% observed. The partial response reported at ENA 2024 has confirmed by RECIST 1.1. We are targeting a Phase 1/2 expansion in the first quarter of 2025 and a clinical data update for the Phase 1 trial in MTAP-deletion UC in 2025.

In February 2025, we expanded our clinical study collaboration and entered into the Second Gilead CSCSA to evaluate the IDE397 and Trodelvy combination in MTAP-deletion NSCLC.

We were collaborating with Amgen to clinically evaluate IDE397 in combination with AMG 193, the Amgen investigational MTA-cooperative PRMT5 inhibitor, in patients having tumors with MTAP deletion, in an Amgen-sponsored clinical trial pursuant to the Amgen CTCSA. We and Amgen mutually agreed to wind down the IDE397 and AMG 193 clinical combination study in February 2025 and will not pursue dose expansion.

There are currently no FDA-approved therapies for patients with MTAP-deletion solid tumors, highlighting the unmet medical need. The priority MTAP-deletion solid tumor types for the IDE397 Phase 1/2 monotherapy program are UC and NSCLC. MTAP-deletion prevalence has been reported at over 15% in NSCLC and over 25% in UC, based on The Cancer Genome Atlas, or TCGA, database. We estimate that the MTAP-deletion annual incidence in the United States in NSCLC and UC is approximately 48,000 patients, based on the 2024 Surveillance, Epidemiology, and End Results database. In addition, there are several potential expansion MTAP-deletion solid tumor types that are also being considered for monotherapy and combination development, including pancreatic, head and neck, gastric, and squamous esophageal cancer, among others. Based on the TCGA database, MTAP-deletion prevalence in pancreatic, head and neck, gastric and squamous esophageal cancer represents an aggregate U.S. annual incidence of approximately 27,000 patients.

We own all rights, title, and interest in and to IDE397 and IDE892, including all worldwide commercial rights thereto.

IDE849 (DLL3) Program with Hengrui Pharma

In December 2024, we entered into the Hengrui Pharma License Agreement, pursuant to which Hengrui Pharma granted us an exclusive worldwide license outside of Greater China, for IDE849 (SHR-4849), a potential first-in-class Phase 1 DLL3 TOP1i ADC. DLL3 has been reported to be expressed in multiple solid tumor types, including in SCLC and Neuroendocrine Tumors at approximately 85% and 20-40%, respectively. DLL3 has limited extracellular expression in normal tissues, making it a promising therapeutic target in these tumor types, for which there remains significant unmet medical need.

IDE849 has shown promising antitumor activity in preclinical studies, including tumor regression as a monotherapy in multiple models. IDE849 is currently being evaluated by Hengrui Pharma in an ongoing Phase 1 trial in China in SCLC patients. In the ongoing Phase 1 dose escalation, IDE849 has reached therapeutic dose levels where multiple partial responses have been observed as of the data cut-off date of December 10, 2024. Among 11 evaluable SCLC subjects treated at therapeutic dose

levels, 8 partial responses by RECIST 1.1 were observed, resulting in an overall response rate of ~73% (including both confirmed and unconfirmed responses, with all unconfirmed responses pending further evaluation). As of the data cut-off date, treatment related adverse events, or TRAEs were predominantly Grade 1 or 2. The Phase 1 dose escalation is ongoing with no reported drug-related discontinuations, and the maximum tolerated dose has not yet been reached. The most common TRAEs observed were white blood cell count decreased, anemia, neutrophil count decreased, nausea and platelet count decreased. In January 2025, Hengrui Pharma selected expansion doses for their Phase 1 trial.

We are planning on submitting a U.S. IND for the evaluation of IDE849 as a monotherapy in SCLC in the first half of 2025. We are also targeting to initiate the evaluation of IDE849 in combination with IDE161 and in NETs in the second half of 2025. A clinical data update is targeted in 2025.

Under the terms of the Hengrui Pharma License Agreement, Hengrui Pharma is eligible to receive upfront and milestone payments totaling $1.045 billion, including a $75.0 million upfront fee, up to $200.0 million in development and regulatory milestone payments, plus commercial success-based milestones. Hengrui Pharma is also eligible to receive mid-single to low-double digit royalties on net sales outside of Greater China.

IDE275 (GSK959) – WRN Inhibitor in Tumors with High Microsatellite Instability

We discovered IDE275 (GSK959), our Werner, or WRN, Helicase inhibitor clinical development candidate and evaluated IDE275 (GSK959) in preclinical studies in collaboration with GSK. IDE275 (GSK959) targets WRN for patients having tumors with MSI-High.

WRN protein is a RecQ enzyme involved in the maintenance of genome integrity. Germline loss of function mutations in WRN lead to premature aging and pre-disposition to cancer. Microsatellite instability is a change in the DNA content of a tumor cell in which the number of repeats of microsatellites, short repeated sequences of DNA, differ as cells divide. MSI-High is present in about 15% of gastrointestinal tumor cancers, including in approximately 22% of stomach adenocarcinoma and 16% of colorectal cancer. Tumors with MSI-High are routinely assessed in multiple diagnostic profiling tests.

WRN is a protein having several functional domains, and we have shown that the helicase functional domain of WRN is responsible for this synthetic lethal interaction, as reflected in our publication in Cell Press – iScience, Werner Syndrome Helicase is Required for the Survival of Cancer Cells with Microsatellite Instability (March 2019).

We have demonstrated preclinical in vivo efficacy with tumor regression and PD response in a relevant MSI-High model. We have observed selectivity of our Werner Helicase inhibitor and validation of the synthetic lethal relationship to tumors with MSI-High over tumors with MSS based on a lack of in vivo pharmacological response in relevant MSS xenograft models.

We, in collaboration with GSK, received IND clearance for IDE275 (GSK959), a potential first-in-class WRN inhibitor, in October 2024 to enable first-in-human clinical evaluation of IDE275 (GSK959) for patients having tumors with MSI-High. GSK will lead clinical development for the Werner Helicase program. GSK is responsible for 80% of global research and development costs, and we are responsible for 20% of such costs. GSK holds a global, exclusive license to develop and commercialize the Werner Helicase Inhibitor DC.

In October 2023, we achieved and earned a $3.0 million milestone in connection with IND-enabling studies. In October 2024, we earned a $7.0 million milestone payment for the IND clearance of IDE275 (GSK 959). We have the potential to earn up to an additional $10.0 million milestone payment upon initiation of Phase 1 clinical dose expansion. We are also eligible to receive further aggregate late-stage development and regulatory milestones of up to $465.0 million. Upon commercialization, we will be eligible to receive up to $475.0 million of commercial milestones, 50% of U.S. net profits and tiered royalties on global non-U.S. net sales of the Werner Helicase Inhibitor DC – ranging from high single-digit to sub-teen double-digit percentages, subject to certain customary reductions.

IDE161 – PARG Inhibitor in Tumors with Homologous Recombination Deficiency

We are evaluating IDE161, a small molecule inhibitor of PARG, in a Phase 1/2 clinical trial, designated as IDE161-001 for patients having tumors with HRD and potentially other genetic and/or molecular signatures. PARG is a novel target in a clinically validated biological pathway. PARG functions as a regulator of DNA repair in the same biochemical pathway as PARP. PARG hydrolyzes PAR chains that are polymerized by PARP enzymes, completing the PAR cycle. Small molecule inhibitors of PARG result in a dose dependent increase in cellular PAR after DNA damage. PARG is a mechanistically distinct target relative to PARP.

We are progressing with enrollment of patients having tumors with HRD into the Phase 1 expansion portion of the Phase 1/2 clinical trial. The selection of an initial Phase 1/2 monotherapy expansion dose has been made in endometrial cancer. In parallel, we are also continuing with Phase 1 dose optimization to confirm a move-forward expansion dose for the planned Phase 2 portion of the clinical trial.

In September 2023, we received Fast Track Designation from the FDA for IDE161 for the treatment of adult patients having advanced or metastatic ovarian cancer with germline or somatic BRCA 1/2 mutations who are platinum resistant and have received prior antiangiogenic and PARP inhibitor therapies and for the treatment of adult patients having advanced or metastatic HR+, Her2- breast cancer with germline or somatic BRCA 1/2 mutations who have progressed following treatment with at least one line of a hormonal therapy, a CDK4/6 inhibitor therapy and a PARP inhibitor therapy.

Under each Fast Track designation, the IDE161 development program in BRCA1/2 mutant (m) breast and ovarian cancers is eligible for various expedited regulatory review processes, including generally more frequent FDA interactions (e.g., meetings, written communications), potential eligibility for rolling review, accelerated approval, and priority review of a future NDA.

In March 2024, we entered into the Merck CTCSA with Merck (known as MSD outside of the United States and Canada). We are evaluating the combination of IDE161 and Merck’s anti-PD-1 therapy KEYTRUDA® (pembrolizumab) in patients with MSI-High and MSS endometrial cancer. Under the Merck CTCSA, Merck will provide KEYTRUDA® to us, and we will sponsor the Phase 1 clinical combination trial.

In December 2024, the first patient was dosed with IDE161 in combination with KEYTRUDA in the Company-sponsored Phase 1 clinical trial. The safety, tolerability, pharmacokinetics, pharmacodynamics and efficacy of IDE161 in combination with KEYTRUDA is being evaluated as an arm in IDE161-001 (NCT05787587), a Company-sponsored Phase 1 trial of IDE161 in solid tumors. We are targeting a Phase 1 expansion in MSI-High and MSS endometrial cancer in 2025.

In October 2024, we presented preclinical results on the IDE161 and ADC combination rationale as a poster at ENA 2024. We are targeting clinical combination(s) of IDE161 with TOP1i-ADCs in 2025.

We entered into an exclusive license under the Evaluation, Option and License Agreement with Cancer Research Technologies Ltd., also known as Cancer Research United Kingdom, or CRT, and the University of Manchester, pursuant to which we hold exclusive worldwide license rights covering a broad class of PARG inhibitors.

In April 2023, we incurred an obligation to pay milestone payments in an aggregate amount of £750,000 to CRT based upon the achievement of certain milestones relating to first and second tumor histologies in connection with the Phase 1 portion of the IDE161-001 Phase 1/2 clinical trial in oncologic diseases. We will be obligated to make additional payments to CRT aggregating up to £18.75 million upon the achievement of specific development and regulatory approval events for development of a PARG inhibitor in oncologic diseases, including an aggregate of up to £1.5 million and up to £2.25 million for the achievement of certain Phase 2 and Phase 3 development milestones, respectively, in each case as relating to first and second tumor histologies.

We own or control all commercial rights in our PARG program, subject to certain economic obligations pursuant to our exclusive, worldwide license to certain PARG inhibitors, including IDE161, with CRT and University of Manchester.

IDE705 (GSK101) – Pol Theta Helicase Inhibitor in tumors with Homologous Recombination Deficiency

We discovered IDE705 (GSK101), our DNA Polymerase Theta, or Pol Theta, Helicase inhibitor clinical development candidate, and evaluated IDE705(GSK101) in preclinical studies in collaboration with GSK. IDE705 (GSK101) targets the helicase domain of the Pol Theta protein for patients having solid tumors with BRCA or other mutations associated with HRD.

Pol Theta is involved in a DNA repair process called microhomology mediated end joining, or MMEJ, that is utilized when homologous recombination mediated repair is compromised, as happens in the case of certain BRCA1 or BRCA2 mutations. The expression of Pol Theta is largely absent in normal cells, but tumor cells harboring double strand break repair defects, such as BRCA1 or BRCA2 mutations, show higher Pol Theta expression and synthetic lethality when Pol Theta is inhibited. Pol Theta is a large protein with two functional domains: a DNA polymerase domain and an ATP-dependent DNA helicase domain, sometimes referred to as an ATPase domain, linked by a RAD51 central region.

GSK is evaluating IDE705 (GSK101) in combination with niraparib, the GSK small molecule inhibitor of PARP for the treatment of patients having tumors with BRCA or other HRD, in a GSK-sponsored Phase 1 clinical trial. GSK has dosed the first patient, and enrollment is ongoing in the dose escalation portion of this study.

GSK is leading clinical development of IDE705 (GSK101) pursuant to the Collaboration, Option and License Agreement with GSK, or GSK Collaboration Agreement. GSK is responsible for all research and development costs for the Pol Theta program.

We have the potential to earn up to an additional $10.0 million milestone payment upon initiation of Phase 1 clinical dose expansion. In August 2023, we achieved and earned a $7.0 million milestone based on acceptance of the IND by the FDA, for which payment was received in October 2023. An earlier preclinical development $3.0 million milestone payment from GSK was achieved in August 2022 in connection with ongoing IND-enabling studies to support evaluation of IDE705 (GSK101).

We have the potential to earn further aggregate late-stage development and regulatory milestones of up to $465.0 million. Upon commercialization, we will be eligible to receive up to $475.0 million of commercial milestones, and tiered royalties on global net sales of GSK101 – ranging from high single-digit to sub-teen double-digit percentages, subject to certain customary reductions.

IDE892 – MTA-cooperative PMRT5 inhibitor

In December 2024, we announced the selection of IDE892, a potential best-in-class MTA-cooperative PRMT5 inhibitor. IDE892 was discovered through our iterative physics-based ligand design and optimization platform, and is a highly potent and selective MTA-cooperative PRMT5 inhibitor with best-in-class potential and favorable drug-like properties. IDE892 has demonstrated exceptionally selective antiproliferative activity in MTAP-deleted tumor cell models and durable complete responses in combination with MAT2A inhibitor IDE397 in challenging MTAP-deletion preclinical models.

IDE892 enables a wholly-owned clinical combination between the PRMT5 and MAT2A mechanisms and delivers potentially greater efficacy in MTAP-deletion solids tumors through this rational combination approach, including favorable potency, selectivity, and synergistic combination potential with MAT2A inhibitor IDE397.

Development of IDE892 is ongoing to support an IND filing to the FDA in mid-year 2025, subject to satisfactory completion of ongoing preclinical and IND-enabling studies.

IDE034 (B7H3/PTK7) program with Biocytogen

In July 2024, we entered into the Biocytogen Option and License Agreement, pursuant to which Biocytogen granted us an option for an exclusive worldwide license

from Biocytogen to develop and commercialize products in connection with a potential first-in-class B7H3/PTK7 topoisomerase-I-inhibitor-payload BsADC program, or the Option. B7H3/PTK7 has been found to be co-expressed in multiple solid tumor types, including double-digit percent prevalence in lung, colorectal, and head and neck cancers, among others. Based on preclinical data, the potential first-in-class B7H3/PTK7 topoisomerase-I-inhibitor-payload BsADC program has the potential to be developed as a monotherapy agent and used in combination with multiple programs in our pipeline targeting DDR-based therapies, including our PARG inhibitor IDE161.

In November 2024, we announced the selection of IDE034, a potential first-in-class B7H3/PTK7 topo-I-payload BsADC, as a development candidate and the exercise of the Option. Under the terms of the Biocytogen Option and License Agreement, we paid Biocytogen an upfront fee and an exercise fee for the Option totaling $6.5 million.

We are targeting an IND submission to the FDA in the second half of 2025 for IDE034, subject to satisfactory completion of ongoing preclinical and IND-enabling studies.

Pursuant to our exercise of the Option, Biocytogen is eligible to receive additional development and regulatory milestone payments and commercial milestone payments, as well as low to mid single-digit royalties on net sales. Total potential milestone payments equal an aggregate of $400.0 million, including development and regulatory milestone payments of up to $100.0 million. Our royalty obligations continue with respect to each country and each product until the later of (i) the date on which such product is no longer covered by certain intellectual property rights in such country and (ii) the 10th anniversary of the first commercial sale of such product in such country.

IDE251 - KAT6/7 inhibitor

In December 2024, we announced the selection of IDE251, a potential first-in-class KAT6/7 inhibitor. IDE251 is an equipotent, highly selective, small molecule dual inhibitor of the lysine acetyltransferase (KAT) 6 and 7, both of which have been shown to support cancer cell survival. IND-enabling studies to support the potential clinical evaluation of IDE251 monotherapy in patients with breast and lung cancers with 8p11 amplification are ongoing, as well as additional opportunities in the setting of lineage addiction. Based on our biomarker evaluation, 8p11 amplification prevalence is projected to be approximately 15% in breast cancer and 17.5% in squamous NSCLC.

IDE251 selectively inhibits both KAT6 and KAT7 while sparing other structurally similar KAT molecules. KAT6 and KAT7 are mechanistically intertwined epigenetic modulators of cell identity and lineage commitment programs corrupted by oncogenic transformation. Dual KAT6/7 inhibition with IDE251 delivers robust and durable anti-tumor activity, superior to KAT6 inhibition alone, in preclinical tumor models with 8p11 amplifications, as well as in biomarker selected indications dependent upon lineage-specific transcription factor activity.

We are targeting an IND submission to the FDA in the second half of 2025 for IDE251, subject to satisfactory completion of ongoing preclinical and IND-enabling studies.

Next-Generation Precision Medicine Pipeline Programs

We have initiated early preclinical research programs focused on pharmacological inhibition of several new targets, or NTs, for patients with solid tumors characterized by defined biomarkers based on genetic mutations and/or molecular signatures. We believe these research programs have the potential for discovery and development of first-in-class or unique-in-class or best-in-class therapeutics. Collectively, we believe these efforts will further advance our multi-pronged clinical and business strategy. We own or control all commercial rights in our next-generation NT programs.

New Target and Biomarker Discovery Platform

Since inception of the company, our core research has and continues to be focused on precision medicine oncology, with synthetic lethality as a central tenet. We have invested significantly and continue to invest in capabilities for identification and validation of new precision medicine targets and biomarkers for patient selection. For targets of interest, we advance our research to discover therapeutic drugs and to further qualify relevant biomarkers.

Precision Medicine Research Platform

The drug discovery platform includes our proprietary chemical library, INQUIRETM, structure-based drug design enabled by extensive structural biology and crystallography capabilities with over 200,000 chemical compounds, and our proprietary content-based machine-learning engine, HARMONYTM, providing effective and efficient molecular design and structure-activity-relationship, or SAR, cycles. We have deep research and development expertise in synthetic lethality – which represents an emerging class of precision medicine targets. We are applying these capabilities to develop a robust pipeline in precision medicine oncology.

DECIPHERTM Dual CRISPER Synthetic Lethality Library – UCSD

We have constructed our DECIPHER Dual CRISPR library for synthetic lethality target and biomarker discovery in collaboration with the University of California, San Diego, and bioinformatics analysis and validation are ongoing. The DECIPHER 1.0 library is focused on DNA Damage Repair targets across various

tumor suppressor genes and oncogenes of interest that were selected based on their known prevalence and role in solid tumors, enabling evaluation of approximately 50,000 independent gene knockout combinations of DDR pathway related drug targets across known tumor suppressor genes.

PAGEOTM Paralogous Gene Evaluation in Ovarian Cancer and Dep Map Consortium – Broad Institute

We have an ongoing strategic collaboration with the Broad Institute focused on synthetic lethality target and biomarker discovery. This collaboration will use the large-scale CRISPR paralog screening platform developed at the laboratory of William R. Sellers, M.D., Core Institute Member, Broad Institute, to evaluate functionally redundant paralogous genes across ovarian cancer subtypes and to generate novel target and biomarker hypotheses. Dr. Sellers, who also serves on our Scientific Advisory Board, is the principal investigator for the strategic collaboration. We have also become a member of the Broad DepMap (Cancer Dependency Map) consortium led by the Broad Institute to further enhance our efforts in bioinformatics and cell-based screening for synthetic lethality target and biomarker discovery and validation.

Small and Medium Enterprise Status from the European Medicines Agency

In June 2024, we were granted Small and Medium Enterprise, or SME, status by the European Medicines Agency, or EMA. This enables us to have access to administrative, regulatory and financial support, including fee reductions for scientific advice and regulatory procedures across all our programs.

Drug Discovery and Program Biomarker Discovery Platform

We are also continuing to invest in our capabilities to advance our research on newly identified synthetic lethality targets of interest, including to enable discovery of therapeutic drugs and program relevant biomarkers. These investments include both additional research personnel and capital investments, which will enhance our

capabilities broadly, including in target validation, biological assay development, protein synthesis, structural biology, computational chemistry, and analytical chemistry, among other core functional areas.

As examples of aspects of our drug discovery platform, we use our INQUIRETM Chemical Library to enhance our synthetic lethality drug discovery platform. INQUIRE is a proprietary, expert-curated small-molecule library of over 200,000 chemical compounds, which we believe will enhance our hit discovery capabilities across a broad range of novel synthetic lethality targets and historically difficult-to-drug target classes, such as helicases and endonucleases.

We use our HARMONY TM machine-learning engine to empower evaluation and decisions related to structure-activity-relationships analyses, empowering our drug-discovery platform.

Strategy

Our objective is to develop and commercialize innovative precision medicine drugs that indirectly or directly target the genetic drivers of cancer in order to provide therapies for defined patient populations. The principal components of our strategy are to:

Continue to efficiently develop our clinical-stage product candidates: darovasertib, IDE397, IDE849, IDE161, IDE275 (GSK959) and IDE705 (GSK101). We are evaluating darovasertib in combination with crizotinib in a potential registrational clinical trial in patients having MUM. We are also evaluating darovasertib as monotherapy in a Phase 2 clinical trial in primary UM and plan to initiate a Phase 3 potential registrational clinical trial in neoadjuvant UM in the first half of 2025. We are currently evaluating IDE397 in a Phase 2 monotherapy expansion cohort in patients with MTAP-deletion solid tumor types, including UC, and NSCLC. We are also evaluating IDE397 in combinations with PRMT5 inhibitors and with Trodelvy (sacituzumab-govitecan-hziy), Gilead’s Trop-2 directed ADC. We plan to evaluate IDE849 in a Phase clinical trial as a monotherapy and in combination with IDE161 in SCLC and NETs. We are currently evaluating IDE161 in a Phase 1 expansion trial in HRD, endometrial cancer and in combination with KEYTRUDA®, Merck’s anti-PD-1 therapy in MSI-High and MSS endometrial cancer.

Advance our preclinical pipeline of small molecule product candidates into clinical development. Our pipeline includes multiple preclinical research programs, including IDE892, a potential best-in-class MTA-cooperative PRMT5 inhibitor development candidate, IDE034, a potential first-in-class B7H3/PTK7 topo-I-payload BsADC development candidate, and IDE251, a potential first-in-class KAT6/7 inhibitor development candidate. We are continuing to invest in our earlier-stage preclinical programs and have established selective, value-accretive collaborations with leading pharmaceutical companies to support our clinical development activities.

Broaden our pipeline of targeted therapies and apply our core capabilities to establish a leading franchise in the field of synthetic lethality. We are continuing our target identification and validation activities for advancing new synthetic lethality targets and associated biomarkers, with active programs for several next-generation synthetic lethality targets. We continue to invest in core functional capabilities, including in drug discovery, bioinformatics and translational biology.

Collaborate with leaders in the field of diagnostics to enable the identification of defined patient populations for our product candidates. Our precision medicine approach leverages the availability or development of companion diagnostics to identify patients for which our product candidates will be most effective.

Collaborate under our existing strategic partnerships and identify additional strategic collaborations to accelerate development timelines and maximize the commercial potential of our targeted product candidates. We have established selective, value-accretive collaborations with leading pharmaceutical companies to support our clinical development activities. We have entered into the Pfizer Agreements, as defined below, for the evaluation of darovasertib in combination with crizotinib in MUM. We are collaborating with Gilead to clinically evaluate IDE397 and Trodelvy (sacituzumab-govitecan-hziy), Gilead’s Trop-2 directed ADC combination, in patients having MTAP-deletion UC and NSCLC, in our Phase 1 clinical trial. We entered into the Merck CTCSA with Merck (known as MSD outside of the United States and Canada) to evaluate the combination of IDE161 with KEYTRUDA® (pembrolizumab) in patients with MSI-High and MSS endometrial cancer in a Phase 1 clinical trial. We have entered into a strategic partnership and collaboration with GSK for our synthetic lethality programs targeting Pol Theta and Werner Helicase pursuant to the GSK Collaboration Agreement. We also entered into two in-licensing agreements for ADCs with topoisomerase-I-inhibitor-payloads to enable combinations with our synthetic

lethality programs with Hengrui Pharma for IDE849 and Biocytogen for IDE034. We will selectively evaluate strategic collaborations for our targeted product candidates with biopharmaceutical partners whose research, development, commercial, marketing, and geographic capabilities complement our own.

Competition

Our industry is very competitive and subject to change based on ongoing advances in technology. Although we believe that our approach, strategy, scientific capabilities, knowledge and experience provide us with competitive advantages, we expect to have substantial competition from major pharmaceutical companies, specialty pharmaceutical companies and biotechnology companies worldwide. Many of our competitors have significantly greater financial, technical and human resources. Smaller and early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies.

As a result, our competitors may discover, develop, license or commercialize products before or more successfully than we do. We face competition with respect to product candidates in our pipeline, and will face competition with respect to future product candidates, from segments of the pharmaceutical, biotechnology and other related markets that pursue targeted approaches to addressing activating genetic and other molecular alterations in cancer.

For darovasertib, we are not aware of other companies actively developing clinical-stage therapeutics directed to PKC as a target for solid tumors. Exscientia is developing a PKC theta inhibitor in inflammatory diseases in Phase 1 studies. Varsity Pharma is preclinically evaluating a PKC inhibitor in CLL. Additionally, Windtree Therapeutics is advancing a preclinical-stage atypical PCK iota inhibitor, including both topical and oral formulations, for potential treatment of Basal Cell Carcinoma, or BCC. We are aware of other companies that are conducting research and development of potential therapies for primary UM or for MUM based on other targets and approaches. For example, Aura Biosciences is developing AU-011, a virus-like drug conjugate (VDC), as local treatment for early-stage choroidal melanoma. Immunocore is developing and commercializing Tebentafusp, also known under its branded name as Kimmtrak, for the treatment of adult patients with HLA-A*02:01-positive unresectable or MUM. iOnctura has initiated a Phase 2 trial for Roginolisib, an allosteric PI3K delta inhibitor, in 2L+ MUM. Novartis is developing DYP688, an ADC, with a GNAQ-11 inhibitor payload in a Phase 1/2 clinical trial in MUM. Additionally, Replimune has initiated a potentially registration-enabling trial for RP-2, an oncolytic immunotherapy.

For IDE397, Servier Pharmaceuticals, LLC, or Servier, is evaluating a small molecule MAT2A inhibitor, designated as S95035, in a Phase 1 trial. Insilico Medicine and Beigene have also initiated Phase 1 trials for their small molecule MAT2A inhibitors called ISM3412 and SYH2039, respectively. Additionally, Anagenex, Genhouse Bio, Hanmi, ScinnoHub and SK Biopharma have small molecule MAT2A inhibitors in preclinical development.

For IDE849, our competitors include companies developing DLL3-targeting therapies using various therapeutic modalities, including bispecific T-cell engagers (BiTEs), antibody-drug conjugates (ADCs), chimeric antigen receptor (T-cell) therapies, and radiopharmaceuticals. Amgen received accelerated approval from the FDA in May 2024 for Tarlatamab (branded name Imdelltra), a DLL3-CD3 BiTE. Boehringer Ingelheim and Daiichi Sankyo are developing drugs with a similar mechanism of action, both in Phase 2 studies. We are aware of several companies developing DLL3 ADCs with topoisomerase-I-inhibitor-payloads in Phase 1 studies, including Zai Lab, Roche, Zhang Jiang, and Baili. In radiopharmaceuticals, Abdera initiated a Phase 1 clinical trial for ABD-147 at the end of 2024, and several other companies are pursuing preclinical development of DLL3-targeting radiotherapies.

For IDE161, 858 Therapeutics has initiated a Phase 1 clinical trial for its small molecule PARG inhibitor, ETX-19477. Danatlas received IND clearance for its PARG inhibitor, DAT-2645, in August 2024, and Evopoint received clearance from the NMPA in December 2024. Additionally, several companies are conducting preclinical research to develop PARG inhibitors, including Alivexis, Azkarra, FoRx, Nodus Oncology, Satya Pharma Innovations and SynRx.

For GSK101 (IDE705), Artios Pharma is developing a Pol Theta inhibitor, designated as ART-6043, in a Phase 1/2 study. Several other companies have initiated Phase 1 studies for Pol Theta inhibitors, including Moma Therapeutics, Repare Therapeutics, Varsity Therapeutics, Simcere, and SynRx. Additionally, Breakpoint Therapeutics and Danatlas have Pol Theta inhibitors in IND-enabling studies.

For GSK959 (IDE275), Novartis is evaluating a non-covalent Werner Helicase (WRN) inhibitor called HRO-761 in a Phase 1 trial. Roche is developing a covalent WRN inhibitor, designated as RG6457, in a Phase 1 trial. Additionally, several companies are conducting preclinical research to develop WRN inhibitors, including Eikon, Genhouse, Insilico, Nimbus, Puhe and Ryvu, among others.

For IDE892, we are aware of many companies developing PRMT5 inhibitors in both clinical and preclinical stages. The most advanced assets are currently in Phase 1/2 studies, including BMS-986504 from BMS, AMG-139 from Amgen, TNG462 from Tango, AZD-3470 from AstraZeneca, and BGB-58067 from Beigene. At least nine other companies have initiated Phase 1 clinical trials and more than fifteen companies are advancing preclinical PRMT5 inhibitors.

For BCG034, we are not aware of any other companies developing bispecific ADCs targeting both B7-H3 and PTK7; however, many companies are developing mono-antigen ADCs targeting either B7-H3 or PTK7. Merck and Hansoh are both evaluating B7-H3 ADCs in Phase 3 clinical trials. Several other companies have B7-H3 ADCs in earlier phases of clinical development, including Beigene, Duality, GSK, Innovent, Mabwell, MacroGenics, MediLink, and Minghui. Furthermore, Genmab, Kelun, and Day One are evaluating PTK7 ADCs in Phase 1 studies, and Lilly is advancing a preclinical PTK7 ADC.

For IDE251, we are not aware of other companies developing therapeutics directed to both KAT6 and KAT7; however, there are several companies developing drugs directed to KAT6. Pfizer is developing a KAT6A inhibitor, designated as PF-07248144, in a Phase 1 trial. Menarini also recently initiated a Phase 1 study for a KAT6A inhibitor called MEN-2312. Olema Oncology received IND clearance for a KAT6A/B inhibitor in December 2024 and is expected to begin a Phase 1 trial soon. Additionally, Isoterix and Qubit are developing preclinical KAT6A inhibitors.

For our preclinical pipeline of synthetic lethality therapeutics, potential competition includes established companies, as well as earlier-stage emerging biotechnology companies. Multiple established companies have been involved with research and development in synthetic lethality, such as AstraZeneca (Lynparza), Pfizer (Talzenna), GSK (Zejula) and Roche. Additionally, several other early-stage companies are developing synthetic lethality therapeutics, including 858 Therapeutics, Artios, Breakpoint Therapeutics, Eikon, FoRx Therapeutics, Repare Therapeutics, Ryvu Therapeutics, Tango, Vividion and Xpose.

Intellectual Property

Intellectual property, including patents, trade secrets, trademarks and copyrights, is important to our business. We endeavor to establish, maintain and enforce intellectual property rights that protect our business interests.

Our patent portfolio, including patents owned by or exclusively licensed to us, is built on a program-by-program basis with a goal of establishing broad protection that generally includes, for each product candidate compound and for selected alternative back-up compounds, claims directed to composition of matter, pharmaceutical compositions, and methods of treatment using such pharmaceutical compositions. For some programs, our portfolio may also include claims directed to methods of treatment involving biomarker-enabled patient identification or selection, methods of treatment involving particular dosing approaches, polymorphs, formulations and/or methods of synthesis. We are seeking and maintaining patent protection in the United States and key foreign jurisdictions.

As of January 26, 2025, we own or exclusively in-license patents and patent applications, comprising approximately 59 distinct patent families, protecting our technology across our pipeline. Excluding applications that we are not currently prosecuting, our portfolio consists of approximately 18 issued U.S. patents, approximately 35 pending U.S. applications, 22 pending applications under the Patent Cooperation Treaty, or PCT, 55 issued foreign patents and approximately 203 pending foreign applications in approximately 50 foreign jurisdictions, including without limitation countries included in major markets in North America, Europe, and Asia, each having expiration dates ranging from 2035 to 2045. The nominal expiration of our patents and patent applications does not account for any applicable patent term adjustments or extensions.

As of January 26, 2025, as relating to our PKC program, including darovasertib, we own or have exclusively in-licensed from Novartis patents and patent applications comprising approximately six issued U.S. patents, approximately 33 issued foreign patents, approximately nine pending U.S. applications, approximately four pending

PCT application, and approximately 33 pending applications in approximately 18 foreign jurisdictions which we are currently prosecuting, including without limitation countries included in major markets in North America, Europe, and Asia. These in-licensed patents and applications are directed to composition of matter, pharmaceutical compositions and methods of treatment, including treatment of UM. These solely owned or in-licensed patent applications, if granted, would expire between 2035 and 2045, without taking into account any applicable patent term adjustments or extensions. In addition, the PKC program portfolio includes two U.S. patent application and two PCT applications which are jointly owned with Pfizer directed to methods of treatment for certain combination treatments.

As of January 26, 2025, as relating to our MAT2A program, including IDE397, we own patents and patent applications comprising approximately four issued U.S. patents, approximately four issued foreign patent, approximately eight pending U.S. applications, approximately five pending PCT applications and approximately 50 pending foreign applications in approximately 28 foreign jurisdictions which we are currently prosecuting, including without limitation countries included in major markets in North America, Europe, and Asia. These solely owned or in-licensed patent applications, if granted, would expire between 2039 and 2044, without taking into account any applicable patent term adjustments or extensions. In addition, the MAT2A program portfolio also includes one pending PCT application directed to methods of treatment of cancer which is jointly owned with GSK pursuant to the GSK Collaboration Agreement; one pending US application, one pending PCT application, and two foreign applications directed to methods of treatment of cancer which is jointly owned with Amgen pursuant to the Amgen CTCSA; and one pending US application directed to methods of treatment of cancer which is jointly owned with Gilead pursuant to the Gilead CSCSA.

As of January 26, 2025, as relating to our PARG program, including IDE161, we own or have exclusively in-licensed from Cancer Research UK and University of Manchester, patents and patent applications comprising approximately three issued U.S. patents, approximately 14 issued foreign patents, approximately three pending U.S. application, and approximately 61 pending foreign applications in approximately 37 foreign jurisdictions which we are currently prosecuting, including without limitation countries included in major markets in North America, Europe, and Asia. These solely owned or in-licensed patent applications, if granted, would expire between 2035 and 2044, without taking into account any applicable patent term adjustments or extensions.

As of February 3, 2024, as relating to our Pol Theta program, GSK holds a global, exclusive license to develop and commercialize Pol Theta products arising out of the Pol theta program.

Our patent portfolio also supports programs in our synthetic lethality preclinical pipeline, including U.S. patent applications directed to composition of matter, pharmaceutical compositions and/or methods of treatment of cancer for each of our Pol Theta (HR), WRN (MSI-High), PRMT5, KAT6A/7, and certain next-generation SLT programs.

Strategic Relationships

We own or control all commercial rights in our three most advanced programs, each of which are clinical-stage programs – darovasertib, IDE397 and IDE161. We have entered into strategic relationships for these programs – for example, to in-license certain intellectual property rights or to enable evaluation of combination therapies, such as through combination drug supply or clinical trial collaborations to evaluate combinations. For darovasertib, we have an exclusive license agreement with Novartis and separately, we have established clinical trial collaboration and supply agreements with Pfizer in support of our clinical evaluation of darovasertib in combination with crizotinib in MUM. For IDE397, we entered into the Gilead CSCSA and the Second Gilead CSCSA to clinically evaluate IDE397 in combination with Trodelvy, the Gilead Trop-2 directed ADC, in patients having MTAP-deletion UC and NSCLC, respectively. For IDE161, we have an exclusive in-license agreement with Cancer Research UK and University of Manchester, and we entered into the Merck CTCSA to clinically evaluate IDE161 in combination with KEYTRUDA, the Merck anti-PD-1 therapy, in patients with endometrial cancer.

We have entered into a strategic partnership and collaboration with GSK for our synthetic lethality programs targeting Pol Theta and Werner Helicase, pursuant to the GSK Collaboration Agreement. We own all commercial rights to our earlier next-generation synthetic lethality programs, including IDE892 and IDE251, for which our small molecule compounds are being discovered and/or developed internally with our own resources, supplemented by certain service providers, such as CROs.

Additionally, in 2024, we entered into two in-licensing agreements for ADCs with topoisomerase-I-inhibitor-payloads to enable combinations with our synthetic lethality programs. Pursuant to the Biocytogen Option and License Agreement, we obtained an option to in-license IDE034, a preclinical B7H3/PTK7 bispecific ADC, and we subsequently exercised the option to obtain worldwide commercial rights to the molecule. We also entered into the Hengrui Pharma License Agreement for global development and commercial rights to IDE849, a DLL3-targeting ADC, outside of Greater China. Under the terms of the Biocytogen Option and License Agreement and the Hengrui Pharma License Agreement, Biocytogen and Hengrui Pharma provide development manufacturing services for the ADCs.

We have established collaborative relationships with other companies for access to their proprietary database of patient samples, and/or for their genetic screening services on their proprietary platform. We have established certain development manufacturing and service relationships with CMOs for darovasertib, IDE397, and IDE161, as well as our preclinical candidates IDE892 and IDE251. We have an agreement with STA Pharmaceutical Hong Kong Limited, or STA Pharmaceutical, and Yuhan Corporation for the synthesis of the API for darovasertib, and agreements with STA Pharmaceutical and Patheon Inc. for formulation and manufacturing of darovasertib drug product. We have an agreement with STA Pharmaceutical for the synthesis of the API, formulation and manufacturing of IDE397 drug product. We have an agreement with Pharmaron for the synthesis of the API, and with STA Pharmaceutical for the formulation and drug product manufacturing of IDE161, IDE892 and IDE251. We have established arrangements with CMOs as well for packaging, labeling and distribution of darovasertib, IDE397, and IDE161. We also have established clinical services relationship with CROs to support our conduct of clinical trials for our darovasertib, IDE397, and IDE161 programs.

In addition to these existing strategic license relationships, existing and planned development manufacturing and service arrangements, and existing and planned clinical services arrangements, we have various existing agreements and relationships with service providers, such as CROs, which are enabling execution of various research and development activities for each of our pipeline programs. In particular, such agreements are directed to chemistry and compound synthesis, compound analysis and characterization, structural biology, computational biology, biological assay and model development, in vitro screening, in vivo screening, translational biomarker diagnostic development, bioinformatics, toxicology and formulation, among other activities.

We may also evaluate future strategic opportunities to accelerate development timelines and maximize the commercial potential of our product candidates. We plan to selectively evaluate strategic collaborations with biopharmaceutical partners whose research, development, commercial, marketing, and geographic capabilities complement our own.

Agreements

Clinical Trial Collaboration and Supply Agreements with Pfizerfor Darovasertib

In March 2020, we entered into a Clinical Trial Collaboration and Supply Agreement with Pfizer, Inc., as amended in September 2020, April 2021, September 2021 and May 2023, or the Pfizer Agreement. Pursuant to the Pfizer Agreement, Pfizer supplies us with their MEK inhibitor, binimetinib, and their cMET inhibitor, crizotinib, to evaluate combinations of darovasertib independently with each of the Pfizer compounds, in patients with tumors harboring activating GNAQ or GNA11 mutations. Under the Pfizer Agreement, we are the sponsor of the combination studies and will provide darovasertib and pay for the costs of the combination studies. Pfizer will provide binimetinib and crizotinib for use in the clinical trial at no cost to us. The Pfizer Agreement provides that we and Pfizer will jointly own clinical data generated from the clinical trial and will also jointly own inventions, if any, relating to the combined use of darovasertib and binimetinib, or independently, to the combined use of darovasertib and crizotinib. We and Pfizer have formed a joint development committee responsible for coordinating all regulatory and other activities under the agreement.

In March 2022, we and Pfizer entered into a Second Clinical Trial Collaboration and Supply Agreement (as amended in May 2023), or the Second Pfizer Agreement, pursuant to which we are evaluating darovasertib and crizotinib as a combination therapy in MUM in a planned Phase 2/3 potential registration-enabling clinical trial. Pursuant to the Second Pfizer Agreement, we are the sponsor of the combination trial and we will provide darovasertib and pay for the costs of the combination trial; Pfizer will provide crizotinib for the planned combination trial at no cost to us for up to an agreed-upon number of MUM patients. We and Pfizer will jointly own clinical data from the planned combination trial and all inventions relating to the combined use of darovasertib and crizotinib. We and Pfizer have formed a joint development committee responsible for coordinating all regulatory and other activities under the Second Pfizer Agreement.

Separately, in March 2022, we and Pfizer also entered into a Third Clinical Trial Collaboration and Supply Agreement, or the Third Pfizer Agreement, pursuant to which we could, subject to preclinical validation and FDA feedback and guidance, evaluate darovasertib and crizotinib, as a combination therapy in cMET-driven tumors such as NSCLC and/or HCC in a Phase 1 clinical trial. Pursuant to the Third Pfizer Agreement, we would have been the sponsor of the planned combination trial, and we would provide darovasertib and pay for the costs of the combination trial; Pfizer would provide crizotinib for the planned combination trial at no cost to us. Pursuant to Amendment No. 1 to the Second Pfizer Agreement, as described below, we and Pfizer terminated the Third Pfizer Agreement.

In May 2023, we continued our relationship with Pfizer by entering into Amendment No. 4 to the Pfizer Agreement relating to the supply of crizotinib in support of this Phase 2 clinical trial, pursuant to which Pfizer will continue to provide us with an additional defined quantity of crizotinib at no cost.

We also expanded our relationship with Pfizer in May 2023 under an Amendment No. 1 to the Second Pfizer Agreement to support the Phase 2/3 registrational trial to evaluate darovasertib and crizotinib as a combination therapy in MUM. Under the as-amended Second Pfizer Agreement, Pfizer will provide us with a first defined quantity of crizotinib at no cost, as well as an additional second defined quantity of crizotinib at a lump-sum cost. The Third Pfizer Agreement has been terminated by us and Pfizer under Amendment No. 1 to the Second Pfizer Agreement.

In December 2024, we entered into Amendment No. 5 to the Pfizer Agreement for the supply of crizotinib in the Phase 1/2 clinical trial for Pfizer to provide us a defined quantity of crizotinib at defined costs.

Exclusive License Agreement with Novartis for Darovasertib

In September 2018, we entered into a license agreement with Novartis to develop and commercialize Novartis’ LXS196 (also known as IDE196), a Phase 1 PKC inhibitor, for the treatment of cancers having GNAQ and GNA11 mutations. We renamed Novartis’ LXS196 oncology as IDE196, and which has a non-proprietary name of darovasertib. Under the license agreement, Novartis granted to us a worldwide, exclusive, sublicensable license to research, develop, manufacture, and commercialize certain defined compounds and products, including IDE196 and certain other PKC inhibitors, as well as companion diagnostic products, collectively referred to as the licensed products, for any purpose.

All inventions, know-how, data and results resulting from our activities under the license agreement, including activities relating to our own clinical trials, will be exclusively owned by us. All inventions, know-how, data and results resulting from Novartis’ activities connected with Novartis’ ongoing Phase 1 clinical trial for IDE196 will be exclusively owned by Novartis, and subject to the license to us. Ownership of all other inventions and know-how will be determined according to U.S. patent law, with Novartis’ interest subject to the license to us.

We control the prosecution and maintenance of the patents exclusively licensed to us, with Novartis retaining step-in rights if we do not continue such prosecution and maintenance. If we fail to maintain or prosecute any exclusively licensed patent and Novartis exercises this step-in right, our license to the relevant patents will terminate in the relevant country. We have the first right to enforce any exclusively licensed patents, while Novartis retains the right to representation. If we do not bring an action to enforce any exclusively licensed patent, Novartis has the right to bring such action, and we will have the right to representation.

We paid Novartis an upfront payment of $2.5 million and issued 263,615 shares of our Series B redeemable convertible preferred stock concurrently with the execution of the license agreement. Subject to completion of certain clinical and regulatory development milestones, we agreed to make milestone payments in the aggregate of up to $9.0 million, and subject to achievement of certain commercial sales milestones, we agreed to make milestone payments in the aggregate of up to $20.0 million. We also agreed to pay mid to high single-digit tiered royalty payments based on annual worldwide net sales of licensed products, payable on a licensed product-by-licensed product and country by country basis until the latest of the expiration of the last to expire exclusively licensed patent, the expiration of regulatory exclusivity, and the ten year anniversary of the first commercial sale of such product in such country. The royalty payments are subject to reductions for lack of patent coverage, loss of market exclusivity, and payment obligations for third-party licenses.

Clinical Trial Collaboration and Supply Agreement with Amgen for IDE397

In July 2022, we entered into the Amgen CTCSA to clinically evaluate IDE397 in combination with AMG 193, the Amgen investigational MTA-cooperative PRMT5 inhibitor, in patients having MTAP-null solid tumors, in a Phase 1/2 clinical trial. We and Amgen mutually agreed to wind down the IDE397 and AMG 193 clinical combination study in February 2025 and will not pursue dose expansion.

Clinical Study Collaboration and Supply Agreement with Gilead for IDE397

In November 2023, we entered into the Gilead CSCSA to clinically evaluate IDE397 in combination with Trodelvy (sacacituzumab-govitecan-hziy), a Trop-2 directed ADC, in patients having MTAP-deletion UC, in a Phase 1 clinical trial. Under the mutually non-exclusive Gilead CSCSA, we will receive Trodelvy drug supply from Gilead and will sponsor the Phase 1 clinical combination trial evaluating ID397 and Trodelvy. Gilead will bear internal or external costs incurred in connection with its supply of Trodelvy. We will bear all internal and external costs and expenses associated with the conduct of the combination study. We and Gilead will jointly oversee clinical development of the combination therapy through a Joint Steering Committee responsible for coordinating all regulatory and other activities under the Gilead CSCSA. We and Gilead each retain commercial rights to its respective compounds, including with respect to use as a monotherapy agent or combination agent.

On February 12, 2025, we entered into the Second Gilead CSCSA with Gilead pursuant to which we and Gilead will collaborate on a portion of our Phase 1 study for the clinical evaluation of IDE397 in combination with Trodelvy, or the Combination Study, in certain patients with advanced solid tumors in lungs. Pursuant to the Second Gilead CSCSA, we are the sponsor of the Combination Study, and we will provide the IDE397 compound and pay for the costs of the Combination Study. Gilead will provide Trodelvy for the Combination Study at no cost to us. We and Gilead will jointly own clinical data from the Combination Study and all inventions relating to the combined use of IDE397 and Trodelvy. Each party retains commercial rights to its respective compounds, including with respect to use as a monotherapy or combination agent. We and Gilead will form a joint steering committee responsible for coordinating all regulatory and other activities under the Second Gilead CSCSA.

Clinical Trial Collaboration and Supply Agreement with Merck for IDE161

In March 2024, we entered into the Merck CTCSA with Merck (known as MSD outside of the United States and Canada) to evaluate the combination of IDE161 with Merck’s anti-PD-1 therapy, KEYTRUDA® (pembrolizumab), in patients with MSI-High and MSS endometrial cancer. Pursuant to the Merck CTCSA, we are the sponsor of the combination study, and we will provide the IDE161 compound and pay for the costs of the combination study. Merck will provide KEYTRUDA at no cost to us. We and Merck will jointly own clinical data from the combination. Each party retains commercial rights to its respective compounds, including with respect to use as a monotherapy or combination agent.

Exclusive Option and License Agreement with Cancer Research UK and University of Manchester for IDE161

In April 2017, we entered into the CRUK/Manchester Agreement with Cancer Research UK and University of Manchester, which was amended on April 24, 2019 and on March 3, 2020, for the development and commercialization of licensed products comprising pharmaceutical preparations of PARG inhibitors for all therapeutic uses.

Under this agreement, Cancer Research UK and University of Manchester have granted to us, and we have in turn granted to Cancer Research UK and University of Manchester, non-exclusive, sublicensable, royalty-free licenses to carry out non-clinical research during the research term, which ended with our exercise of our option described below. The non-clinical research was governed by a joint research committee comprised of representatives from each party. During the research term, no party was to undertake a drug discovery program in PARG inhibitors other than under this agreement.

Cancer Research UK also granted us the exclusive option to obtain an exclusive, sublicensable, worldwide, royalty-bearing license, under certain Cancer Research UK background intellectual property and Cancer Research UK’s interest in any intellectual property jointly developed under the agreement, to research, develop, manufacture, and commercialize licensed products, as well as a non-exclusive, sublicensable, royalty-free, freedom-to-operate license under related intellectual property. Cancer Research UK and University of Manchester retain certain rights under the licensed intellectual property for academic, non-commercial research and teaching.

In January 2022, we exercised our option for an exclusive worldwide license covering a broad class of PARG inhibitors from Cancer Research Technology Ltd., or CRT, and the University of Manchester, and in connection therewith, paid a one-time option exercise fee of £250,000.

Following our option exercise, we gained sole control and responsibility for the research, development, manufacture, and commercialization of the licensed PARG inhibitors. Cancer Research UK also transferred its know how relating to the research, development or manufacturing of the licensed PARG inhibitors to us. We are obligated to develop a PARG inhibitor for the treatment of a cancer indication now that we exercised the option.

Each party is the sole owner of any intellectual property it develops solely under the agreement, and the parties will be joint owners of any jointly developed intellectual property. Each party grants the other a non-exclusive, fully-paid, royalty free, irrevocable, sublicensable, perpetual license to its rights in such jointly created intellectual property to make, use and sell inventions claimed in the joint patents, except for those joint patents exclusively licensed to us under the agreement following our exercise of the option.

We will be obligated to make payments to CRT aggregating up to a total of £19.5 million upon the achievement of specific development and regulatory approval events for development of a PARG inhibitor in oncologic diseases. We will also pay low single-digit tiered royalties, and potentially also sales-based milestones, to CRT based on net sales of licensed products. In addition, in the event we sublicense the intellectual property, we will also be obligated to pay CRT a specified percentage of any sublicense revenue.

Certain of the clinical and regulatory milestones are related to and may be due and payable by us if certain milestones are achieved in connection with the IDE161-001 Phase 1/2 clinical trial. We will be obligated to make additional payments to CRT aggregating up to £18.75 million upon the achievement of specific development and regulatory approval events for development of a PARG inhibitor in oncologic diseases, including an aggregate of up to £1.5 million and up to £2.25 million for the achievement of certain Phase 2 and Phase 3 development milestones, respectively, in each case as relating to first and second tumor histologies.

Collaboration, Option and License Agreement with GSK for Pol Theta and Werner Helicase

In June 2020, we entered into the GSK Collaboration Agreement with GSK, pursuant to which we and GSK have entered into a collaboration for its synthetic lethality programs targeting MAT2A, Pol Theta and WRN. On July 27, 2020, we and GSK received Hart-Scott-Rodino Antitrust Improvements Act clearance, and the GSK Collaboration Agreement became effective.

Pursuant to the GSK Collaboration Agreement, GSK paid us $100.0 million on July 31, 2020. As of December 31, 2024, GSK has made aggregate payments in the amount of $20.0 million for the achievement of certain development and regulatory milestones with respect to Pol Theta and WRN products.

GSK Collaboration - Pol Theta Program

Pursuant to the GSK Collaboration Agreement, GSK holds a global, exclusive license to develop and commercialize Pol Theta products arising out of the Pol Theta program. We and GSK collaborated on preclinical research for the Pol Theta program, and GSK is leading clinical development for the Pol Theta program. GSK is responsible for all research and development costs for the Pol Theta program.

We will be eligible to receive total development and regulatory milestones of up to $485.0 million, with respect to each Pol Theta product, including as applicable, for multiple Pol Theta products that target certain alternative protein domains or are based on alternative modalities. Additionally, we will be eligible to receive up to $475.0

million of commercial milestones with respect to each Pol Theta product. We are also entitled to receive tiered royalties on global net sales of Pol Theta products by GSK, its affiliates and their sublicensees ranging from high single digit to sub-teen double-digit percentages, subject to certain customary reductions.

In June 2022, we announced the nomination of a Pol Theta Helicase Inhibitor development candidate, or DC, and in August 2022, we announced the achievement of an initial preclinical development milestone in connection with ongoing investigational new drug, or IND-enabling studies to support evaluation of Pol Theta Helicase Inhibitor DC, triggering a $3.0 million milestone payment, which we received in October 2022. An IND was submitted and was cleared by the FDA in August 2023 to enable clinical evaluation in combination with niraparib, triggering a $7.0 million milestone payment.

We have the potential to achieve an additional $10.0 million development milestone upon initiation of Phase 1 clinical dose expansion, as well as potential further aggregate late-stage development and regulatory milestones of up to $465.0 million.

GSK Collaboration - Werner Helicase Program

Pursuant to the GSK Collaboration Agreement, GSK holds a global, exclusive license to develop and commercialize WRN products arising out of the WRN program. We and GSK are collaborating on ongoing preclinical research for the WRN program, and GSK will lead clinical development for the WRN program, with us responsible for 20% and GSK responsible for 80% of such global research and development costs. The cost-sharing percentages will be adjusted based on the actual ratio of U.S. to global profits for WRN products, as measured three and six years after global commercial launch thereof.

We will be eligible to receive total development milestones of up to $485.0 million, with respect to each WRN product, including as applicable, for multiple WRN products that are based on alternative modalities. Additionally, we will be eligible to receive up to $475.0 million of commercial milestones with respect to each WRN product. We will be entitled to receive 50% of U.S. net profits and tiered royalties on global non-U.S. net sales of WRN products by GSK, its affiliates and their sublicensees ranging from high single digit to sub-teen double-digit percentages, subject to certain customary reductions. We will have a right to opt-out of the 50% U.S. net profit share and corresponding research and development cost share for the WRN program, and would be eligible to receive tiered royalties on U.S. net sales of WRN products by GSK, its affiliates and their sublicensees at the same royalty rates as for global non-U.S. net sales thereafter, with economic adjustments based on the stage of the WRN program at the time of opt-out.

In October 2023, we earned a $3.0 million milestone from GSK in connection with IND-enabling studies for the Werner Helicase Inhibitor DC. In October 2024, we earned a $7.0 million milestone payment for the IND clearance of IDE275 (GSK 959). We have the potential to earn up to an additional $10.0 million milestone payment upon initiation of Phase 1 clinical dose expansion. We are also eligible to receive further aggregate late-stage development and regulatory milestones of up to $465.0 million.

GSK Collaboration - General

Under the terms of the GSK Collaboration Agreement, subject to certain exceptions, we and GSK will not, directly or through third parties, develop or commercialize other products whose primary and intended mechanism of action is the modulation of WRN or Pol Theta for an agreed upon period of time. We and GSK have formed a joint steering committee, joint development committees, and joint commercialization committees responsible for coordinating all activities under the GSK Collaboration Agreement. Ownership of intellectual property developed under the GSK Collaboration Agreement is allocated between or shared by the parties depending on development and subject matter.

GSK’s royalty obligations continue with respect to each country and each product until the later of (i) the date on which such product is no longer covered by certain intellectual property rights in such country and (ii) the 10th anniversary of the first commercial sale of such product in such country.

Each party has the right to sublicense its rights under the GSK Collaboration Agreement subject to certain conditions.

The GSK Collaboration Agreement will continue in effect on a product-by-product and country-by-country basis until the expiration of the obligation to make payments under the GSK Collaboration Agreement with respect to such product in each country, unless earlier terminated by either party pursuant to its terms. Either party may

terminate the GSK Collaboration Agreement for the other party’s insolvency or certain uncured breaches. We may terminate the GSK Collaboration Agreement if GSK or any of its sublicensees or affiliates challenge certain patents of ours. GSK may terminate the GSK Collaboration Agreement in its entirety or on a target-by-target basis upon 90-day notice to us.

Option and License Agreement with Biocytogen for IDE034

In July 2024, we entered into the Biocytogen Option and License Agreement with Biocytogen, pursuant to which Biocytogen granted us an option for an exclusive worldwide license to develop and commercialize products in connection with a potential first-in-class B7H3/PTK7 topoisomerase-I-inhibitor-payload BsADC program, or the Option. Under the terms of the Biocytogen Option and License Agreement, we paid Biocytogen an upfront fee and, upon our exercise of the Option, an exercise fee totaling up to $6.5 million.

In November 2024, we announced the selection of IDE034, a potential first-in-class B7H3/PTK7 topo-I-payload BsADC, as a development candidate and the exercise of the Option. Pursuant to our exercise of the Option, Biocytogen is eligible to receive additional development and regulatory milestone payments and commercial milestone payments, as well as low to mid single-digit royalties on net sales. Total potential milestone payments equal an aggregate of $400.0 million, including development and regulatory milestone payments of up to $100.0 million. Our royalty obligations continue with respect to each country and each product until the later of (i) the date on which such product is no longer covered by certain intellectual property rights in such country and (ii) the 10th anniversary of the first commercial sale of such product in such country.

We will have the right to terminate the Biocytogen Option and License Agreement for any reason or no reason upon ninety (90) days written notice to Biocytogen. Upon any termination of the Biocytogen Option and License Agreement after the exercise of the Option, the license granted to us will automatically terminate. We will have the right to sell any or all of the inventory of Licensed Products held by us as of the date of termination for a period of 12 months following such termination.

License Agreement with Hengrui Pharma for IDE849 (SHR-4849)

In December 2024, we entered into the Hengrui Pharma License Agreement with Hengrui Pharma, pursuant to which Hengrui Pharma granted us an exclusive worldwide license outside of Greater China to develop and commercialize SHR-4849, a novel DLL3-targeting topo-I-payload antibody drug conjugate.

Pursuant to the Hengrui Pharma License Agreement, Hengrui Pharma is eligible to receive upfront and milestone payments totaling $1.045 billion, including a $75.0 million upfront fee, up to $200.0 million in development and regulatory milestone payments, plus commercial success-based milestones. Hengrui Pharma is also eligible to receive mid-single to low-double digit royalties on net sales outside of Greater China.

The Hengrui Pharma License Agreement will continue in effect on a product-by-product and country-by-country basis until the expiration of the obligation to make payments under the Hengrui Pharma License Agreement with respect to such product in each country, unless earlier terminated by either party pursuant to its terms. Either party may terminate the Hengrui Pharma License Agreement upon mutual agreement or for the other party’s insolvency or certain uncured material breaches. We may terminate the Hengrui Pharma License Agreement for any reason upon certain notice to Hengrui Pharma.

Sales and Marketing

We intend to become a fully integrated, commercial stage biopharmaceutical company. This will enable us to realize our goal of delivering transformative medicines to patients in need. We currently hold worldwide commercialization rights for darovasertib, IDE397, and IDE161 and own or control all commercial rights outside of greater China for IDE849. We intend to retain significant rights in key markets. Considering our stage of development, we have not yet fully built our commercialization capabilities. We have begun planning for potential commercial operations, including for sales and marketing capabilities, subject to the results of our Phase 2/3 clinical trial for darovasertib.

We expect to initiate commercial readiness activities in anticipation of regulatory approvals. To enable our delivery of any approved medicines to patients, we plan to build our own sales force to commercialize them in the United States and potentially in Europe and other selected foreign countries. We believe a moderately sized specialty sales force, supported by effective marketing and sales management organizations, would enable us to reach healthcare practitioners who specialize in the care of the patient populations for darovasertib and our other product candidates. We may also enter into distribution and other marketing arrangements with third parties for any of our approved medicines to support their safe and effective use.

Manufacturing

We currently rely, and expect to continue to rely, on third parties for the manufacture of our product candidates and our biomarker diagnostics for preclinical and clinical testing, as well as for future commercial manufacture of any drugs and diagnostics that we may commercialize. We do not own or operate, and currently have no plans to establish, any manufacturing facilities.

In general, we plan to establish agreements with contract manufacturing organizations, or CMOs, for synthesis of the active pharmaceutical ingredient, or API, manufacturing of drug product comprising such API, as well as packaging, labeling and distribution.

We have also established supply arrangements with one or more CMOs for each of our small molecule development programs and with Biocytogen and Hengrui Pharma for our in-licensed ADCs in support of our current clinical development needs.

Our lead product candidates darovasertib, IDE397, IDE275 (GSK 959), IDE161, IDE705 (GSK 101) are each small molecules that can be manufactured in reliable and reproducible synthetic processes from readily available starting materials. We believe the synthetic chemistry is amenable to scale-up using standard manufacturing equipment and processes. We expect that the compounds being discovered and developed for our other pipeline programs and other future programs, can be produced at contract manufacturing facilities.

In many cases, we anticipate that the biomarker diagnostic may be commercially available on an existing third-party diagnostic panel or assay. In cases where such biomarker diagnostic is not already commercially available, we generally expect to establish agreements with strategic partners for clinical supply of companion diagnostics for biomarkers associated with the targeted therapeutics we are developing.

Government Regulation

Government authorities in the United States, at the federal, state and local level, and in other countries extensively regulate, among other things, the research, development, testing, manufacture, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, marketing and export and import of products such as those we are developing. A new drug must be approved by the FDA through the NDA process before it may be legally marketed in the United States.

U.S. Drug Development Process

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or the FDCA, and its implementing regulations. 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. Failure to comply with the applicable U.S. requirements at any time during the product development process, approval process or after approval may subject an applicant to administrative or judicial sanctions. These sanctions could include the FDA’s refusal to approve pending applications, withdrawal of an approval, a clinical hold, warning letters, product recalls, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement or civil or criminal penalties. Any agency or judicial enforcement action could have a material adverse effect on us.

The process required by the FDA before a drug may be marketed in the United States generally involves the following:

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completion of preclinical laboratory tests, animal studies and formulation studies in accordance with good laboratory practice, or GLP, regulations and other applicable regulations;

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submission to the FDA of an IND, which must become effective before clinical trials in humans may begin;

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approval by an independent institutional review board, or IRB, at each clinical site before each clinical trial may be initiated;

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performance of adequate and well-controlled human clinical trials in accordance with good clinical practice, or GCP, regulations to establish the safety and efficacy of the proposed drug for its intended use;

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submission to the FDA of an NDA;

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satisfactory completion of an FDA advisory committee review, if applicable;

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satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the drug is produced to assess compliance with current good manufacturing practice, or cGMP, regulations to assure that the facilities, methods and controls are adequate to preserve the drug’s identity, strength, quality and purity; and

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FDA review and approval of the NDA.

Once a pharmaceutical product candidate is identified for development, it enters the preclinical testing stage. Preclinical tests include laboratory evaluations of product chemistry, toxicity and formulation, as well as animal studies. An IND sponsor must submit the results of the preclinical tests, together with manufacturing information and analytical data, to the FDA as part of the IND. The sponsor will also include a protocol detailing, among other things, the objectives of the first phase clinical trial, the parameters to be used in monitoring safety, and the effectiveness criteria to be evaluated, if the first phase lends itself to an efficacy evaluation. Some preclinical testing may continue even after the IND is submitted. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, places the clinical trial on a clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. A clinical hold also may be imposed by the FDA at any time during a clinical trial due to safety concerns or non-compliance with specific FDA requirements, and the clinical trial may not continue until the FDA notifies the sponsor that the hold has been lifted.

All clinical trials must be conducted under the supervision of one or more qualified investigators in accordance with GCP regulations, which include the requirement that all research subjects provide their informed consent in writing for their participation in any clinical trial. They must be conducted under protocols detailing the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria and the safety and effectiveness criteria to be evaluated. Each protocol must be submitted to the FDA as part of the IND. An IRB at each institution participating in the clinical trial must review and approve each protocol before a clinical trial commences at that institution and must also approve the information regarding the clinical trial and the consent form that must be provided to each clinical trial subject or his or her legal representative, monitor the clinical trial until completed and otherwise comply with IRB regulations.

Human clinical trials are typically conducted in three sequential phases that may overlap or be combined:

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Phase 1: The product candidate is initially introduced into healthy human subjects and tested for safety, dosage tolerance, absorption, metabolism, distribution and excretion and, if possible, to gain an early indication of its effectiveness. In the case of some products for severe or life-threatening diseases, such as cancer, especially when the product may be too inherently toxic to ethically administer to healthy volunteers, the initial human testing is often conducted in patients. Sponsors sometimes designate their Phase 1 clinical trials as Phase 1a or Phase 1b. Phase 1b clinical trials are typically aimed at confirming dosing, pharmacokinetics and safety in a larger number of patients. Some Phase 1b studies evaluate biomarkers or surrogate markers that may be associated with efficacy in patients with specific types of diseases.

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Phase 2: This phase involves clinical trials in a limited patient population to identify possible adverse effects and safety risks, to preliminarily evaluate the efficacy of the product for specific targeted diseases and to determine dosage tolerance and appropriate dosage.

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Phase 3: Clinical trials are undertaken to further evaluate dosage, clinical efficacy and safety in an expanded patient population, generally at geographically dispersed clinical trial sites. These clinical trials are intended to establish the overall risk-benefit ratio of the product candidate and provide, if appropriate, an adequate basis for product labeling.

Post-approval trials, sometimes referred to as Phase 4 clinical trials, may be conducted after initial marketing approval. These clinical trials are used to gain additional experience from the treatment of patients in the intended therapeutic indication. In certain instances, the FDA may mandate the performance of Phase 4 clinical trials as a condition of approval of an NDA.

The FDA or the sponsor may suspend a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients. In addition, some clinical trials are overseen by an independent group of qualified experts organized by the sponsor, known as a data safety monitoring board or committee. Depending on its charter, this group may determine whether a clinical trial may move forward at designated check points based on access to certain data from the clinical trial.

During the development of a new drug, 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 2, and before an NDA 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. Sponsors typically use the meetings at the end of the Phase 2 clinical trial to discuss Phase 2 clinical results and present plans for the pivotal Phase 3 clinical trials that they believe will support approval of the new drug.

Concurrent with clinical trials, companies may conduct additional animal studies and also develop additional information about the chemistry and physical characteristics of the drug and finalize a process for manufacturing the 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, among other things, the manufacturer must develop methods for testing the identity, strength, quality and purity of the final drug. In addition, 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.

While the IND is active and before approval, progress reports summarizing the results of the clinical trials and nonclinical studies performed since the last progress report must be submitted at least annually to the FDA, and written IND safety reports must be submitted to the FDA and investigators for serious and unexpected suspected AEs, findings from other studies suggesting a significant risk to humans exposed to the same or similar drugs, findings from animal or laboratory testing suggesting a significant risk to humans, and any clinically important increased incidence of a serious suspected adverse reaction compared to that listed in the protocol or investigator brochure.

There are also requirements governing the reporting of ongoing clinical trials and completed clinical trial results to public registries. Sponsors of certain clinical trials of FDA-regulated products are required to register and disclose specified clinical trial information, which is publicly available at www.clinicaltrials.gov. Information related to the product, patient population, phase of investigation, clinical trial sites and investigators and other aspects of the clinical trial is then made public as part of the registration. Sponsors are also obligated to discuss the results of their clinical trials after completion. Disclosure of the results of these clinical trials can be delayed until the new product or new indication being studied has been approved.

U.S. Review and Approval Process

The results of product development, preclinical and other non-clinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the chemistry of the drug, proposed labeling and other relevant information are submitted to the FDA as part of an NDA requesting approval to market the product. The submission of an NDA is subject to the payment of substantial user fees; a waiver of such fees may be obtained under certain limited circumstances. The FDA reviews an NDA to determine, among other things, whether a product is safe and effective for its intended use and whether its manufacturing is cGMP-compliant to

IDYA US Equity

IDYA · 10-K · period ended 2024-12-31

Item 1. Business.

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IDYA · 10-K · period ended 2024-12-31

Item 1. Business.

IDYA US Equity