FHTX 8-K
Foghorn Therapeutics Inc. (FHTX)
8-K
2024-11-04
For: 2024-11-04
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April 11, 2026
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
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FORM 8-K
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CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): November 4, 2024
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(Exact name of registrant as specified in its charter)
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| (State or other jurisdiction of incorporation) | (Commission File Number) | (IRS Employer Identification No.) | ||||||||||||
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(Registrant’s telephone number, including area code): (617 ) 586-3100
Not Applicable
(Former name or former address, if changed since last report)
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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
| Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) | |||||
| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) | |||||
| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) | |||||
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) | |||||
Securities registered pursuant to Section 12(b) of the Act:
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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
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. ☐
Item 2.02 Results of Operations and Financial Condition.
On November 4, 2024, Foghorn Therapeutics Inc. (the “Company”) issued a press release announcing certain of the Company’s financial results for the quarter ended September 30, 2024. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.
The information in this Item 2.02 (including Exhibit 99.1 attached hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing by the Company under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing.
Item 7.01 Regulation FD Disclosure.
The Company is furnishing as Exhibit 99.2 to this Current Report on Form 8-K a presentation, dated November 2024, which the Company intends to use in meetings with or presentations to investors.
The information in this Item 7.01 (including Exhibit 99.2 attached hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing by the Company under the Securities Act or the Exchange Act, except as expressly set forth by specific reference in such filing.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
| Exhibit No. | Description | ||||
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
FOGHORN THERAPEUTICS INC. | |||||||||||
| By: | /s/ Kristian Humer | ||||||||||
| Kristian Humer | |||||||||||
| Chief Financial Officer | |||||||||||
Exhibit 99.1
Foghorn Therapeutics Provides Third Quarter 2024 Financial and Corporate Update
First patient dosed with first-in-class SMARCA2(BRM) selective inhibitor FHD-909 (LY4050784) in Phase 1 trial with primary target population in SMARCA4(BRG1) mutated NSCLC
First patient dosed with first-in-class SMARCA2(BRM) selective inhibitor FHD-909 (LY4050784) in Phase 1 trial with primary target population in SMARCA4(BRG1) mutated NSCLC
Topline Phase 1 dose escalation data for FHD-286 plus decitabine in patients with relapsed and/or refractory AML expected by year-end 2024
IND-enabling studies for Selective CBP degrader program on track to begin by year-end 2024
Strong balance sheet with cash, cash equivalents, and marketable securities of
$267.4 million as of September 30, 2024, provides cash runway into 2027
CAMBRIDGE, Mass. -- (GLOBE NEWSWIRE) – November 4, 2024 -- Foghorn® Therapeutics Inc. (Nasdaq: FHTX), a clinical-stage biotechnology company pioneering a new class of medicines that treat serious diseases by correcting abnormal gene expression, today provided a financial and corporate update in conjunction with the Company’s 10-Q filing for the quarter ended September 30, 2024. With an initial focus in oncology, Foghorn’s Gene Traffic Control® Platform and resulting broad pipeline have the potential to transform the lives of people suffering from a wide spectrum of diseases.
“We continue to advance our pipeline of multiple therapeutics targeting novel biology in the chromatin regulatory system. The first patient was recently dosed with FHD-909, a highly selective SMARCA2 (BRM) inhibitor, that targets the SMARCA2 synthetic lethal relationship with SMARCA4 (BRG1) mutated NSCLC. We look forward to further clinical progress with the FHD-909 program in collaboration with our partner Lilly,” said Adrian Gottschalk, President and Chief Executive Officer of Foghorn. “By year-end, we expect data from our FHD-286 combination study in AML and expect to initiate IND-enabling studies for our Selective CBP degrader program targeting tumors harboring EP300 mutations, including bladder, gastric, and endometrial cancers. With our strong cash position and runway into 2027, we are poised to advance our clinical and preclinical pipeline.”
Recent Corporate Updates
Presented at 7th Annual Targeted Protein Degradation (TPD) Summit. In October, Foghorn participated in multiple sessions at the 7th Annual TPD Summit, including a CEO Think Tank keynote session entitled "A Strategic Look at Targeted Protein Degradation & Induced Proximity Field" featuring Foghorn’s CEO Adrian Gottschalk, and a presentation by Steve Bellon, Foghorn’s Chief Scientific Officer, on the recent developments from Foghorn’s degrader pipeline.
Dosed First Patient with FHD-909. In October, the first patient was dosed with FHD-909 in the Phase 1 open-label, multicenter trial for SMARCA4 mutated cancers, with non-small cell lung cancer (NSCLC) as the primary target patient population.
Strengthened Executive Leadership. In September, Foghorn appointed Anna Rivkin, Ph.D., as Chief Business Officer. Dr. Rivkin brings over two decades of expertise establishing strategic alliances, R&D partnerships, in-licensing and M&A. Most recently, she held leadership roles at Bristol Myers Squibb
where she successfully oversaw a broad range of complex business transactions across multiple disease areas.
Program Overview and Upcoming Milestones
FHD-286. FHD-286 is a potent, first-in-class, selective inhibitor of the SMARCA2 (BRM) and SMARCA4 (BRG1) subunits of the BAF chromatin remodeling complex where dependency on SMARCA2/SMARCA4 is well-established preclinically with multiple tumor types, including acute myeloid leukemia (AML)/myelodysplastic syndrome (MDS), NSCLC and prostate cancer.
•AML Phase 1 trial. The ongoing Phase 1 dose escalation trial is evaluating the safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and preliminary clinical activity of FHD-286 in combination with decitabine or low-dose cytarabine in patients with relapsed and/or refractory AML who have failed multiple courses of therapy. FHD-286 previously demonstrated a promising mutation-agnostic differentiation effect in a single-agent dose escalation trial.
•Topline safety, tolerability, initial efficacy, and PK/PD data expected by year-end 2024.
FHD-909 (LY4050784). FHD-909 is a first-in-class oral SMARCA2 selective inhibitor that has demonstrated in preclinical studies to have high selectivity over its closely related paralog SMARCA4, two proteins that are the catalytic engines across all forms of the BAF complex. SMARCA4 mutations are common across tumor types, including approximately 10% of NSCLC, and result in tumors being dependent on SMARCA2 activity for their survival. Selectively blocking SMARCA2 activity is a promising synthetic lethal strategy intended to induce tumor death while sparing healthy cells.
•Dosed first patient. In October 2024, the first patient was dosed in the Phase 1 trial for FHD-909 in SMARCA4 mutated cancers, with NSCLC as the primary target patient population.
•Strategic collaboration with Lilly. In December 2021, Foghorn announced a strategic collaboration with Lilly to create novel oncology medicines that includes a U.S. 50/50 co-development and co-commercialization agreement for Foghorn’s Selective SMARCA2 oncology program, agreements for a selective inhibitor and a selective degrader, and an additional undisclosed oncology target. The collaboration also includes three discovery programs using Foghorn’s proprietary Gene Traffic Control platform.
Selective CBP degrader program. Foghorn is advancing its Selective CBP degrader program to selectively target CBP in EP300 mutated cancer cells. CBP and EP300 are highly similar acetyltransferases that create a synthetic lethal relationship when EP300 is mutated. Attempts to selectively drug CBP have been challenging due to the high level of similarity between the two proteins, while dual inhibition of CBP/EP300 has been limited by hematopoietic toxicity.
•Robust antitumor activity in EP300 loss tumors. In April, Foghorn presented new pharmacodynamic and pharmacokinetic preclinical data at the 2024 AACR Annual Meeting and during a pipeline update call. In October, Foghorn presented additional data on efficacy, tolerability, and formulation at the 7th Annual TPD & Induced Proximity Summit. These data include:
◦Deep and sustained CBP degradation significantly inhibited tumor growth in mouse xenograft solid tumor models.
◦Robust monotherapy preclinical anti-tumor activity that was not associated with significant body weight loss, thrombocytopenia or anemia.
◦Identification of potent and selective CBP protein degraders with first-in-class potential to address tumors harboring EP300 mutations in many types of cancer, including bladder, gastric and endometrial cancers.
◦Identification of long-acting injection formulation that resulted in tumor regression from a single dose in a mouse xenograft efficacy study.
•Investigational New Drug (IND)-enabling studies are on track to initiate by the fourth quarter of 2024.
Selective EP300 degrader program. Foghorn is advancing its Selective EP300 degrader program for CBP mutant and EP300-dependent cancers. Attempts to selectively drug EP300 have been challenging due to the high level of similarity between the two proteins, while dual inhibition of CBP/EP300 has been limited by hematopoietic toxicity.
•Robust anti-tumor activity in CBP mutant and EP300 dependent cancers. In April, Foghorn presented new pharmacodynamic and pharmacokinetic preclinical data at the 2024 AACR Annual Meeting and during a pipeline update call highlighting:
•Well-tolerated in vivo with no observed decrease in platelet levels, with no effects on megakaryocyte viability at pharmacologically relevant concentrations in ex vivo studies.
•Identification of potent and selective EP300 degraders with anti-tumor activity in prostate and hematological malignancies, including prostate cancer, multiple myeloma, and diffuse large B cell lymphoma.
Selective ARID1B degrader program.
ARID1A is the most mutated subunit in the BAF complex and amongst the most mutated proteins in oncology. These mutations lead to a dependency on ARID1B in several types of cancer, including ovarian, endometrial, colorectal, and bladder. Attempts to selectively drug ARID1B have been challenging because of the high degree of similarity between ARID1A and ARID1B and the fact that ARID1B has no enzymatic activity to target.
•Highly potent and selective binders developed. In April, Foghorn presented data demonstrating potent and selective small molecule binders to ARID1B. The Company is in the process of converting these selective binders into heterobifunctional degraders.
Third Quarter 2024 Financial Highlights
•Collaboration Revenues. Collaboration revenue was $7.8 million for the three months ended September 30, 2024, compared to $17.5 million for the three months ended September 30, 2023. The three months ended September 30, 2023 included $16.1 million revenue from a Merck collaboration that ended in August 2023. The revenue in the three months ended September 30, 2024 was driven by the continued advancement of programs under the Lilly Collaboration Agreement.
•Research and Development Expenses. Research and development expenses were $24.7 million for the three months ended September 30, 2024, compared to $26.3 million for the three months ended September 30, 2023. The decrease is attributed to an increase in Lilly partnered programs of $3.3 million, partially offset by decreases in personnel-related costs, early development and other research external costs and facilities and IT related expenses of $5.0 million.
General and Administrative Expenses. General and administrative expenses were $7.0 million for the three months ended September 30, 2024, compared to $8.3 million for the three months ended September 30, 2023. This decrease was primarily due to lower personnel-related costs.
•Net Loss. Net loss was $19.1 million for the three months ended September 30, 2024, compared to a net loss of $14.3 million for the three months ended September 30, 2023.
•Cash, Cash Equivalents and Marketable Securities. As of September 30, 2024, the Company had $267.4 million in cash, cash equivalents and marketable securities, providing expected cash runway into 2027.
About FHD-286
FHD-286 is a highly potent, first-in-class, selective, allosteric, and orally available small-molecule, enzymatic inhibitor of SMARCA2 (BRM) and SMARCA4 (BRG1), two highly similar proteins that are the ATPases, or the catalytic engines, of the BAF complex, one of the key regulators within the chromatin regulatory system. In preclinical studies, FHD-286 has shown anti-tumor activity across a broad range of malignancies, including both hematologic and solid tumors.
About AML
Adult acute myeloid leukemia (AML) is a cancer of the blood and bone marrow and the most common type of acute leukemia in adults. AML is a diverse disease associated with multiple genetic mutations. It is diagnosed in about 20,000 people every year in the United States.
About FHD-909
FHD-909 (LY4050784) is a potent, first-in-class, allosteric, and orally available small molecule that selectively inhibits the ATPase activity of SMARCA2 (BRM) over its closely related paralog SMARCA4 (BRG1), two proteins that are the catalytic engines across all forms of the BAF complex, one of the key regulators of the chromatin regulatory system. In preclinical studies, tumors with mutations in SMARCA4 rely on SMARCA2 for their survival. FHD-909 has shown significant anti-tumor activity across multiple SMARCA4 mutant lung tumor models.
About Foghorn Therapeutics
Foghorn® Therapeutics is discovering and developing a novel class of medicines targeting genetically determined dependencies within the chromatin regulatory system. Through its proprietary scalable Gene Traffic Control® platform, Foghorn is systematically studying, identifying, and validating potential drug targets within the chromatin regulatory system. The Company is developing multiple product candidates in oncology. Visit our website at www.foghorntx.com for more information on the Company, and follow us on X (formerly Twitter) and LinkedIn.
Forward-Looking Statements
This press release contains “forward-looking statements.” Forward-looking statements include statements regarding the Company’s clinical trials, including its ongoing Phase 1 trial of FHD-286 in combination with decitabine in relapsed and/or refractory AML patients and the ongoing Phase 1 trial of FHD-909 in SMARCA4-mutated cancers , pre-clinical product candidates, expected timing of clinical data, expected cash runway, expected timing of regulatory filings, and research efforts and other statements identified by words such as “could,” “may,” “might,” “will,” “likely,” “anticipates,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects,” “continues,” “projects” and similar references to future periods. Forward-looking statements are based on our current expectations and assumptions regarding capital market conditions, our business, the economy and other future conditions. Because forward-looking
statements relate to the future, by their nature, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. As a result, actual results may differ materially from those contemplated by the forward-looking statements. Important factors that could cause actual results to differ materially from those in the forward-looking statements include regional, national or global political, economic, business, competitive, market and regulatory conditions, including risks relating to our clinical trials and other factors set forth under the heading “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the Securities and Exchange Commission. Any forward-looking statement made in this press release speaks only as of the date on which it is made.
Condensed Consolidated Balance Sheets
(In thousands)
| September 30, 2024 | December 31, 2023 | ||||||||||
| Cash, cash equivalents and marketable securities | $ | 267,397 | $ | 234,057 | |||||||
All other assets | 40,975 | 51,859 | |||||||||
Total assets | $ | 308,372 | $ | 285,916 | |||||||
Deferred revenue, total | $ | 282,919 | $ | 302,665 | |||||||
All other liabilities | 53,740 | 60,441 | |||||||||
Total liabilities | $ | 336,659 | $ | 363,106 | |||||||
Total stockholders’ deficit | $ | (28,287) | $ | (77,190) | |||||||
Total liabilities and stockholders’ deficit | $ | 308,372 | $ | 285,916 | |||||||
Condensed Consolidated Statements of Operations
(In thousands, except share and per share amounts)
| Three Months Ended September 30, | |||||||||||
| 2024 | 2023 | ||||||||||
| Collaboration revenue | $ | 7,808 | $ | 17,478 | |||||||
| Operating expenses: | |||||||||||
| Research and development | 24,689 | 26,251 | |||||||||
| General and administrative | 6,971 | 8,308 | |||||||||
| Total operating expenses | $ | 31,660 | $ | 34,559 | |||||||
| Loss from operations | $ | (23,852) | $ | (17,081) | |||||||
| Total other income, net | $ | 4,730 | $ | 3,474 | |||||||
| Provision for income taxes | $ | — | $ | (738) | |||||||
| Net loss | $ | (19,122) | $ | (14,345) | |||||||
| Net loss per share attributable to common stockholders—basic and diluted | (0.31) | (0.34) | |||||||||
| Weighted average common shares outstanding—basic and diluted | 62,602,848 | 42,025,938 | |||||||||
Contacts:
Karin Hellsvik, Foghorn Therapeutics Inc. (Investors & Media)
[email protected]
[email protected]
Adam Silverstein, ScientPR (Media)
[email protected]
[email protected]
Peter Kelleher, LifeSci Advisors (Investors)
November 2024 Unique biology Precision therapeutics Broad impact Exhibit 99.2
| Forward Looking Statements 2 This presentation contains forward-looking statements that are based on management's beliefs and assumptions and on information currently available to management. All statements other than statements of historical facts contained in this presentation are forward- looking statements. In some cases, you can identify forward-looking statements by terms such as “could,” “may,” “might,” “will,” “likely,” “anticipates,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects,” “continues,” “projects” or the negative of these terms or other similar expressions, although not all forward-looking statements contain these words. Forward-looking statements include, but are not limited to, statements concerning: the potential outcomes from our collaboration agreement with Lilly; the initiation, timing, progress and results of our research and development programs and pre-clinical studies and clinical trials, including with respect to our Phase 1 trial of FHD-286 in combination with decitabine in relapsed and/or refractory AML patients and anticipated timing of release of clinical data, and the Phase 1 dose escalation trial of FHD-909 with Lilly; our ability to advance product candidates that we may develop and to successfully complete preclinical and clinical studies; our ability to leverage our initial programs to develop additional product candidates using our Gene Traffic Control Platform®; the impact of exogeneous factors, including macroeconomic and geopolitical circumstances, on our and our collaborators’ business operations, including our research and development programs and pre-clinical studies; developments related to our competitors and our industry; our ability to expand the target populations of our programs and the availability of patients for clinical testing; our ability to obtain regulatory approval for FHD-286, FHD-909 and any future product candidates from the FDA and other regulatory authorities; our ability to identify and enter into future license agreements and collaborations; our ability to continue to rely on our CDMOs and CROs for our manufacturing and research needs; regulatory developments in the United States and foreign countries; our ability to attract and retain key scientific and management personnel; the scope of protection we are able to establish, maintain and enforce for intellectual property rights covering FHD-286, FHD-909, our future products and our Gene Traffic Control Platform; and our use of proceeds from capital-raising transactions, estimates of our expenses, capital requirements, and needs for additional financing. You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this presentation. Additional important factors to be considered in connection with forward-looking statements are described in the Company's filings with the Securities and Exchange Commission, including withing the section entitled "Risk Factors" in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2023. Any forward-looking statements represent the Company’s views only as of the date of this presentation and should not be relied upon as representing its views as of any subsequent date. The Company explicitly disclaims any obligation to update any forward-looking statements. The Company’s business is subject to substantial risks and uncertainties.
| Foghorn is the Pioneer in Chromatin Biology, an Untapped Area for Therapeutics 3 What if … It were possible to develop a therapeutic approach to treat half of all cancers? Chromatin biology is implicated in up to 50% of tumors ~2.5 million cancer patients Potential for therapeutic area expansion (e.g., I&I)
| Chromatin Regulatory System Orchestrates Gene Expression; Multiple Opportunities for Targets and Therapeutics 4 Chromatin – compacted form of DNA inside the nucleus of the cell Chromatin Remodeling Complex – specialized multiprotein machineries that allow access to DNA Transcription Factor – proteins that help turn specific genes "on" or "off" by working in concert with the chromatin remodeling complex to bind to DNA Helicases & Other Chromatin Binding Proteins involved in gene expression / function Gene expression in the right cells at the right time is critical for normal growth, development, and homeostasis
| Foghorn has Progressed Multiple Programs Against Challenging Targets 5 SMARCA2: Potential in up to 5% of all solid tumors Challenge: Industry has failed to develop a selective inhibitor EP300: Role in both solid and heme malignancies Challenge: Toxicities with dual inhibition, difficulty engineering selectivity ARID1B: Role in ovarian, endometrial, colorectal cancer Challenge: Industry has had no success with selective target engagement SMARCA2 / SMARCA4: Implicated across solid and hematologic malignancies Challenge: Can dual inhibition yield clinical benefit? Selective EP300 Degrader IND enabling studies anticipated in 2025 FHD-909 first selective inhibitor in the clinic CBP: Role in bladder, colorectal, breast, gastric, lung cancers Challenge: Toxicities with dual inhibition, difficulty engineering selectivity Selective CBP Degrader IND enabling studies anticipated by end of year FHD-286 dual inhibitor in the clinic Data H2 ‘24 Selective ARID1B binder identified. Critical step towards degradation … and more.SMARCA2 = BRM SMARCA4 = BRG1
| Foghorn’s Gene Traffic Control® Platform Designed to Deliver Precision, First-in-Class Therapeutics: Integrated, Scalable, Efficient, Repeatable 6 1. Chromatin Biology • Bioinformatics • Genomics • Epigenomics 2. Assays & Biochemistry Capabilities 3. Chemistry & Drugging • Selective, small molecules (inhibitors, protein degraders, TF disruptors) • Protein degradation platform • Formulation & long-acting delivery Identify Dependencies Legend: Patents | Know How / Trade Secret “What to Drug” “How to Drug” Deep mechanistic understanding of chromatin regulatory system Biology first, small molecule modality agnostic Engineering selectivity via unique assays and protein capabilities • Protein purification, production & interrogation • High fidelity, difficult to make proteins • In silico modeling and computational chemistry “Where to Drug”
| Foghorn's Unique Platform Capabilities Evolved from Drugging a Specific Chromatin Remodeling Complex (BAF)* 7 • Purification & recombinant production of large proteins and protein complexes • Biochemistry & biophysics of intrinsically disordered proteins • High throughput screening for binders and inhibitors • Proprietary linker library • Suite of assays specific to degradation (i.e., synthesis kinetics, degradation kinetics) • Optimal E3 ligase pairing • Ternary complex modeling • Long-acting formulation technology Protein Degrader PlatformAssays and Biochemistry Capabilities BAF Chromatin Remodeling Complex Challenge: produce, manipulate, study, and drug a 1.5 megadalton multi-protein complex Challenge: drug highly similar proteins that have no enzymatic function • Selectively drugging highly similar proteins / hard to drug proteins • Disease area expansion • Going beyond chromatin – novel biology with complex proteins • Payloads for ADCs* Current and Future Applications ` *Brahma-Associated Factor (BAF). Antibody Drug Conjugates (ADCs).
| The Next Foghorn Chapter: Delivering Multiple Potential Blockbusters into the Clinic 8 Pioneering BAF and Chromatin Biology (2016 – 2020) Built platform and developed deep understanding of biology Producing BAF and transcription factors at scale Demonstrated druggability of chromatin regulatory system Lilly strategic collaboration FHD-286 demonstrated mutation-agnostic differentiation effect in acute myeloid leukemia (AML) Initiated efforts on CBP and EP300 Expansion of protein degrader platform • Proof of concept data for SMARCA2 Selective Inhibition (FHD-909) in NSCLC* • Registrational trials for FHD-286 in AML • Potential for 5 additional INDs • Pipeline, platform, disease area expansion Differentiation POC, Platform & Pipeline Expansion (2021 – 2023) Progress Multiple High Value Assets into the Clinic (2024 – 2027) *Non-small cell lung cancer (NSCLC)
| Foghorn Is Advancing a Pipeline of First-in-Class Precision Therapeutics with Potential for Broad Application in Oncology … 9 Modality Program Phase 1 Enzyme Inhibitors Transcription Factor Disruptors Undisclosed Protein Degraders Commercial Rights FHD-286 (SMARCA2 / SMARCA4) FHD-909* (Selective SMARCA2) 3 Discovery Programs Undisclosed Partnered Undisclosed Disease SMARCA4 mutant cancers (e.g., NSCLC, bladder, endometrial, colorectal) Relapsed/Refractory AML Selective SMARCA2 SMARCA4 mutant cancers (e.g., NSCLC, bladder, endometrial, colorectal) Selective ARID1B ARID1A mutant cancers (e.g., ovarian, endometrial, colorectal) Selective CBP EP300 mutant cancers (e.g., bladder, gastric, breast, NSCLC, colorectal) Selective EP300 EP300 dependent cancers (e.g., prostate, DLBCL), CBP mutant cancers (e.g., NSCLC, bladder) Undisclosed Undisclosed Undisclosed Pre-Clinical Phase 2 / 3Discovery *LY4050784 SMARCA2 = BRM SMARCA4 = BRG1
| … with Multiple Near-Term Value Inflection Points through 2026 10 Q4 2024AML Combination Dose Escalation Data FHD-286 October 2024Phase 1: First Patient DosedFHD-909 (Selective SMARCA2 Inhibitor) ConfidentialIND Filing / Phase 1 InitiationSelective SMARCA2 Degrader Year End 2024Initiate IND-Enabling StudiesSelective CBP Degrader 2025Initiate IND-Enabling StudiesSelective EP300 Degrader ConfidentialTarget Disclosure and IND FilingLilly Target #2 H1 2026Development CandidateSelective ARID1B Degrader SMARCA2 = BRM SMARCA4 = BRG1 ConfidentialPhase 1 Dose Escalation Data
| Potential Multi-Billion Dollar Opportunities in Oncology 11 Foghorn Owned Selective CBP Degrader Selective EP300 Degrader Lilly Target #3 Selective ARID1B Degrader FHD-286 (R/R AML, Other) Potential for therapeutic area expansion (e.g., immunology and inflammation) Partnered w Lilly $500M to $2B Market Opportunities Each Greater than $2B Market Opportunities Each Selective SMARCA2 Inhibitor (FHD-909) Selective SMARCA2 Degrader Lilly Target #2
Clinical & Pre-Clinical Programs • FHD-286 – Dual SMARCA2 / SMARCA4 Inhibitor • FHD-909 (LY4050784) – Selective SMARCA2 Inhibitor • Selective CBP Degrader • Selective EP300 Degrader • Selective ARID1B Program
FHD-286: Dual SMARCA2 / SMARCA4 Inhibition Targeting BAF Dependency in Cancer FHD-609 is a Selective, Potent, Protein Degrader of the BRD9 component of the BAF complexSMARCA2 = BRM SMARCA4 = BRG1
| Exploring BAF Dependency in Cancer with FHD-286 – Potent, First-in-Class, Oral Dual Inhibitor of SMARCA2 and SMARCA4 14 Clinical and pre-clinical data demonstrated broad- based differentiation across AML and multiple solid tumors BAF ATPase: SMARCA2 / SMARCA4 FHD-286: • Allosteric modulation inhibiting the activity of both SMARCA2 and SMARCA4 • Oral, daily, potent, first-in-class, small molecule inhibitor FHD-286 Differentiation Pre-clinical data support ability to overcome drug resistance (i.e., EGFR NSCLC, enzalutamide- resistant CRPC, PD-1 refractory) Overcoming Drug Resistance Clinical data demonstrated an increase of CD8+ T-cells and a reduction of T-regulatory cells Immune Modulation Current and Potential Future Opportunity Pre-clinical data support ability to address BAF mutationsMutations
| Significant Opportunity for Novel, Effective Therapy in Patients with R/R AML 15 • >50% of patients relapse • Intensive chemo – still standard of care Most cases of AML are not curable 40% of AML cases have no actionable mutations • No meaningful developments for broad AML patient population since Venetoclax • Recent developments focused on actionable mutations (e.g., FLT3, IDH1/2, MLL**) ̽ Source: Decision Resources Group 2025 Forecast: **Menin inhibitors not yet approved; R/R: relapsed/refractory; CRc: composite complete response • Post Ven/Aza: o No standard of care o CRc rates 15-17% o Median OS ~3mo • High unmet need Initial FHD-286 Opportunity ~17,000 Drug Treatable R/R Patients* FHD-286 Opportunity: R/R Patients and Potentially Newly Diagnosed Patients
| FHD-286 Demonstrated Promising Mutation-Agnostic Differentiation Effects in Single Agent Phase 1 Trial 16 Dose Level Mutations Cytogenetics Risk Starting CD11b% Max CD11b% CD11b+ Fold Change Starting CD34% Min CD34% CD34+ % Decrease 10mg N/A Adverse 7 62 9.2x 94 27 (71%) 7.5mg CBFB (locus at 16q22) 2 94 59.4x 70 2 (97%) 7.5mg KMT2A rearrangement Adverse 3 58 21.4x 85 9 (90%) 7.5mg RUNX1, KRAS, ASXL1, JAK2, TET2, EZH2, ETNK Adverse 5 73 15x 95 18 (81%) 7.5mg N/A Adverse 8 52 6.3x 94 33 (65%) 7.5mg ASXL1, TP53, U2AF1 Adverse 19 63 3.3x 92 51 (45%) 5mg RUNX1, NRAS, KRAS, SF3B1, ASXL2, CSF3R, GATA2 Adverse 3 74 29x 94 19 (80%) 5mg RUNX1, NRAS, ASLX1 Adverse 4 97 22.8x 98 7 (93%) 5mg N/A Adverse 6 79 13x 93 11 (88%) 5mg TET2, WT1 GATA2 PLCG2 ARHGEF28, BRD4, CDK12, DDX41, KMT20, PARP1, ZRSR2 3 24 8.1x 86 62 (27%) 5mg N/A Adverse 4 28 6.5x 93 66 (29%) 5mg DNMT3a, TET2 21 88 4.1x 30 4 (88%) 2.5mg NRAS, WT1 Adverse 3 13 4.8x 93 89 (4%) CD11b (marker of differentiation) increases CD34 (leukemic stem cell marker) decreases
| Dose Escalation Trial Design in Combination with Decitabine in AML 17 Target Indication: • R/R AML Treatment Plan & Dose Escalation: • 3+3 escalation design • Oral FHD-286, QD, 28-day cycles • Standard decitabine dose schedule Key Objectives Primary • Safety/Tolerability • Maximum Tolerated Dose (MTD) and/or Recommended Phase 2 Dose (RP2D) determinations Secondary • Preliminary clinical activity • PK parameters of FHD-286 in combination with Decitabine in subjects on/off triazole antifungal agents classified as strong CYP3A4 inhibitors Exploratory • PD effects of FHD-286 in combination with Decitabine • MRD FHD-286: 1.5 mg QD + Decitabine FHD-286: 2.5 mg QD + Decitabine FHD-286: 5 mg QD + Decitabine FHD-286: 7.5 mg QD + Decitabine FHD-286: 2.5 mg QD + Decitabine FHD-286: 5 mg QD + Decitabine FHD-286: 7.5 mg QD + Decitabine Potential Next Steps: FHD-286 + Decitabine Expansion FHD-286 + Other Agent Escalation Subjects on a triazole antifungal agent classified as a strong CYP3A4 inhibitor Subjects NOT on a triazole antifungal agent classified as a strong CYP3A4 inhibitor Parallel Dose Escalations Potential additional escalations Potential additional escalations
| FHD-286 + decitabine (MLL-AFP + FLT3 TKD Luc/GFP PDX) Pre-Clinical Data Demonstrated Combination Potential with Multiple Agents in AML 18 FHD-286 + BET inhibitor (mtNPM1 + FLT3 ITD Luc/GFP AML PDX) FHD-286 + menin inhibitor (mtNPM1 + FLT3 ITD Luc/GFP AML PDX) FHD-286 + cytarabine (MV4, 11 FLT3 ITD CDX) SNDX-5613: Menin inhibitor 0 20 40 60 0 25 50 75 100 Days, post-infusion % S ur vi va l FHD-286 + decitabine (n=8) 1 mg/kg decitabine (n=7) 1.5 mg/kg FHD-286 (n=7) Vehicle (n=7)6 weeks Rx ✱ ✱ ✱ ✱ ✱
| FHD-286 Has Potential in Multiple High-Value Oncology Indications 19 R/R AML combinations (e.g., decitabine, menin inhibitors, others) Other Hematologic and Solid TumorsTKI Combination Front-Line AML Combination
Selective SMARCA2 Modulators For SMARCA4 Mutated Cancers FHD-286 is a Potent, Selective, Allosteric, Small Molecule Inhibitor of the BRG1 and BRM subunits of the BAF complexSMARCA2 = BRM SMARCA4 = BRG1
| FHD-909, SMARCA2 Selective Inhibitor in Phase 1 Trial; Selective SMARCA2 Degrader Continues Late-Stage Pre-Clinical Development 21 SMARCA2 Selective Inhibitor (FHD-909*) SMARCA2 Selective Degrader Biology Exploit the synthetic lethal relationship between SMARCA2 and mutated SMARCA4 Stage Phase 1 dose escalation trial Advancing in parallel through late pre- clinical development Opportunity SMARCA4 mutated cancer including ~10% of NSCLC and up to 5% of all solid tumors Lilly Partnership 50/50 global R&D cost share | 50/50 U.S. economics | tiered ex-U.S. royalties starting in the low double-digit range and escalating into the twenties *LY4050784
| Selective SMARCA2 Inhibition: Promising Strategy to Exploit Synthetic Lethal Relationship Between SMARCA2 and Mutant SMARCA4 22 No SMARCA4 Mutations SMARCA4 Mutation SMARCA4 Mutation and SMARCA2i Cell Survival Cell Death Healthy Cells Cancer Cells SMARCA4 SMARCA2 BAF Complex BAF Complex Mutant SMARCA4 BAF Complex SMARCA2i Precision medicine targeting synthetic lethal relationships is a proven clinical approach now used in multiple cancers (e.g., PARP inhibitors) SMARCA4 SMARCA2
| SMARCA4 is Mutated in Up to 10% of NSCLC; Up to 5% of Solid Tumors 23 SMARCA4 mutated across a broad range of tumors Accounts for ~5% of solid tumors AACR GENIE via cBioPortal
| SMARCA4 mutated in up to 10% of NSCLC tumors, minimal overlap with other mutations2Overall Survival for SMARCA4wt vs SMARCA4mut1 Patients with NSCLC Harboring SMARCA4 Mutations Have Significantly Worse Clinical Outcomes and Define a High Unmet Need Patient Population 24 SMARCA4 10% KRAS 29% EGFR 26% ALK 7% RET 4% MET 7% 1. Alessi JV, et al., 2021; 2. TCGA via cBioPortal
| SMARCA4 WT SMARCA4 MUT 0.0001 0.001 0.01 0.1 1 A bs ol ut e IC 50 (μ M ) NCI-H2122 CALU6 NCI-H2172 NCI-H441 NCI-H2170 NCI-H460 NCI-H1703 NCI-H358 NCI-H2009 NCI-H1944 NCI-H1299 A549 RERFLCAI NCI-H1693 NCI-H1568 NCI-H2023 NCI-H838 SMARCA4 (WT) SMARCA4 (MUT) (SMARCA2 Only)(SMARCA2 & SMARCA4) FHD-909 Demonstrated Approximately 33-fold Selectivity Across 17 SMARCA4 Mutant and Wild-Type Cell Lines In Vivo 25 Spread in potency for wild type versus mutant cell lines indicates 33-fold selectivity observed Selectivity = 33x Median IC50 (µM) SMARCA4 WT 0.0932 SMARCA4 MUT 0.0028
| FHD-909 Monotherapy Demonstrated Regression In Vivo in H2126 SMARCA4 Mutant NSCLC Model and Was Well Tolerated 26 H2126 Reduction in Tumor Volume H2126 Body Weight Genetic Background: SMARCA4 W764R, TP53 E62*, STK11-/-, CDKN2A-/-, KEAP1 R272C NOTE: All doses were well tolerated. Dosing holidays were applied at the high dose, as appropriate 0 7 14 21 28 100 150 200 250 300 350 Days of Dosing (Dose Start Day1) Tu m or v ol um e (m m 3 ) Vehicle Control FHD-909, 20mg/kg, PO, BID FHD-909, 40mg/kg, PO, BID FHD-909, 60mg/kg, PO, BID 0 7 14 21 28 80 90 100 110 120 Days of Dosing (Dose Start Day1) B od y W ei gh t ( % o f S ta rt in g W ei gh t)
| RERF-LC-AI Model FHD-909 Monotherapy Demonstrated 96% TGI in A549 and Tumor Stasis in RERF-LC-AI Mutant NSCLC Models 27 A549 Model NOTE: All doses were well tolerated. Dosing holidays were applied at the high dose, as appropriate 0 7 14 21 28 200 400 600 800 1000 1200 Days of Dosing (Dose Start Day1) Tu m or V ol um e (m m 3 ) Vehicle Control FHD-909 20mg/kg, BID, PO FHD-909, 40mg/kg, BID, PO FHD-909, 60mg/kg, BID, PO 0 7 14 21 28 0 250 500 750 1000 1250 1500 Days of Dosing (Dose Start Day1) Tu m or V ol um e (m m 3 ) Vehicle Control 20mg/kg LY4050784, PO, BID 40mg/kg LY4050784, PO, BID SMARCA4 mut p.E1496*, TP53 p.Q104*, NF1 p.E1699* SMARCA4, Q729fs / H736Y, KRAS G12S, STK11-/-, CDKN2A-/-, KEAP1 G333C Genetic Background Genetic Background FHD-909 20mg/kg, BID, PO FHD-909 40mg/kg, BID, PO Vehicle Control
| FHD-909 Monotherapy Demonstrated Regression in H1793 SMARCA4 Mutant NSCLC Model 28 H1793 Model • FHD-909 delivered across range of SMARCA4 mut xenograft models • Results ranging from impressive TGI to regression as monotherapy • All doses across all four models were well tolerated NOTE: All doses were well tolerated. Dosing holidays were applied at the high dose, as appropriate 0 7 14 21 28 100 200 300 400 500 Days of Dosing (Dose Start Day1) Tu m or V ol um e (m m 3 ) Vehicle Control FHD-909, 20mg/kg, BID, PO FHD-909, 40mg/kg, BID, PO FHD-909, 60mg/kg, BID, PO SMARCA4, E514*, TP53 R209* R273H, ARID1A C884*Genetic Background
| FHD-909 Trial Design • Restricted to SMARCA4 mutated tumors • SMARCA4 mutant status confirmed by standard NGS panel • Further enrichment for NSCLC patients as trial progresses • Tumor histology agnostic 29 Dose Escalation Dose Expansion • Arm 1: SMARCA4 mutant NSCLC • Arm 2: Other SMARCA4 mutant tumors (e.g., bladder, endometrial, colorectal) • Potential for combination arm(s)
| SMARCA2 Selective Degrader Achieved Complete SMARCA2 Degradation and Cell Growth Inhibition In Vitro 30 Degraders Caused Time- and Dose-Dependent SMARCA2 Degradation Antiproliferative Effects in A549 Mutant NSCLC Model A549 Ten-Day Proliferation AssaySMARCA2 / SMARCA4 HIBIT Data 0.01 0.1 1 10 100 -50 0 50 100 150 FHT-SMARCA2d Concentration (uM) % In hi bi tio n % Inhibition of Cell Growth SMARCA2 SMARCA4 % D eg ra da tio n Concentration (uM) 0 25 50 75 100 1E-3 0.01 0.1 1 10 Data as of Q4 2021
| CBP and EP300 Proteins – A Decades Long Challenge in Selectivity 31 • CBP and EP300 are chromatin regulators and histone acetyltransferases • CBP and EP300 are virtually identical, thus achieving selectivity is a significant challenge • Dual targeting has revealed tolerability and safety issues Foghorn is working on two separate programs, each with their own defined dependencies and patient populations
Selective CBP Protein Degrader For EP300 Mutated Cancers
| Summary: Selective CBP Protein Degrader for EP300 Mutated Cancers 33* Per year incidence in the U.S., EU5, Japan . Source: Clarivate DRG Mature Markets Data. Target / Approach • CREB binding protein (CBP) • Targeted protein degrader Initial Indication • EP300 mutated cancers (e.g., subsets of bladder, colorectal, breast, gastric and lung cancers) Mutation / Aberration • EP300 mutated cancers Stage • Pre-clinical New Patients Impacted / Year* • Over 100,000 10% 10% 8% 7% 6% 6% 5% 5% 3% 0% 5% 10% 15% Melanoma NSCLC Bladder Cancer Endometrial Gastric Breast Pancreatic Cancer Colorectal Cancer Commercial Opportunity SCCHN % of Patients with EP300 Mutation
| Selective CBP Degradation Resulted in Significant Tumor Growth Inhibition in Colorectal & Bladder and Regression in Gastric EP300 Null Models 34
| Bone Marrow Staining (In Vivo)Platelet Counts Post Two Weeks of Dosing (In Vivo) Pre-Clinical Studies Indicate Selective CBP Degradation Did Not Show Thrombocytopenia and Spares Megakaryocytes In Vivo 35 PLT (x109cells/L) 0 500 1,000 1,500 2,000 2,500 Study Day 14 Pl at el et s (X 10 3 c el ls /u L) Vehicle FHT-CBPd, 10mg/kg, sc, QD Dual BD inhibitor, 30mg/kg, p.o, BID FHT-CBPd Dual CBP/EP300 Inhibitor Vehicle Dual CBP / EP300 InhibitorControl Rat Control dCBP-10 10mg/kg QD Mouse Megakaryocyte Hypoplasia Megakaryocyte Sparing
| Pre-Clinical Studies Indicate Long-Acting Injectable Formulations of CBP Degrader Could Enable At Least Once Every 2 Weeks Dosing 36 dCBP-9 PK/PD (60mg/kg, sc) dCBP-9 PK/PD (150mg/kg, sc) dCBP-9 PK/PD (150mg/kg, im) 0 24 48 72 96 120 144 168 192 216 240 264 288 312 336 360 0 25 50 75 100 125 10 100 1000 10000 Hour Post Dose C BP L ev el s / % Ve hi cl e Plasm a PK (ng/m L) CBP Levels - PDPlasma PK (ng/ml) 0 24 48 72 96 120 144 168 192 216 240 264 288 312 336 360 0 25 50 75 100 125 10 100 1000 10000 Hour Post Dose C B P Le ve ls / % Ve hi cl e Plasm a PK (ng/m L) CBP Levels - PDPlasma PK (ng/ml) 0 24 48 72 96 120 144 168 192 216 240 264 288 312 336 360 0 25 50 75 100 125 10 100 1000 10000 Hour Post Dose C B P Le ve ls / % Ve hi cl e Plasm a PK (ng/m L) CBP Levels - PDPlasma PK (ng/ml)
Selective EP300 Protein Degrader For CBP Mutated and EP300 Dependent Cancers
| Summary: Selective EP300 Protein Degrader for CBP Mutant & EP300 Dependent Cancers 38 * Per year incidence in the U.S., EU5, Japan. Source: Clarivate DRG Mature Markets Data. Target / Approach • E1A binding protein p300 (EP300) • Targeted protein degrader Initial Indications • AR+ Prostate • DLBCL • Bladder, melanoma, others Mutation / Aberration • EP300 dependent cancers • CBP mutant cancers Stage • Pre-clinical New Patients Impacted / Year* • Over 100,000 Commercial Opportunity EP300 Dependent Cancers • Solid Tumors • AR+ mCRPC • HR+ breast • Hematologic malignancies • DLBCL • Multiple Myeloma CBP Mutant Cancers 10% 10% 9% 8% 8% 8% 6% 0% 5% 10% 15% Melanoma Bladder NSCLC Endometrial Colorectal Gastric Breast % of Patients with CBP Mutation
| EP300 Degradation Results in Significant Tumor Growth Inhibition in AR+ VCAP Prostate and KARPAS422 DLBCL Models 39 Prostate AR+ VCAP Model DLBCL KARPAS422 (CBP Null) Model 5 10 15 20 25 30 35 40 45 50 0 500 1,000 1,500 2,000 Days After Tumor Inoculation Tu m or V ol um e (m m ³ + S EM ) Vehicle Control Enzalutamide, 30mg/kg, QD FHT-EP300d, 50mg/kg, BID 10 20 30 40 50 -20 -15 -10 -5 0 5 10 15 20 Days After Tumor Inoculation B od y W ei gh t C ha ng e (% ) 5 10 15 20 25 30 35 40 45 -20 -10 0 10 20 B od y W ei gh t C ha ng e (% ) Days After Tumor Inoculation 5 10 15 20 25 30 35 40 45 0 500 1,000 1,500 2,000 Days After Tumor Inoculation Tu m or V ol um e (m m ³+ S EM ) Vehicle Control FHT-EP300d, 50mg/kg (BID) FHT-EP300d, 20mg/kg, (BID) FHT-EP300d, 10mg/kg, (BID)
| Selective EP300 Degradation Does Not Show Thrombocytopenia In Vivo 40 Platelet Counts Post Two Weeks of Dosing (In-Vivo) PLT (x109cells/L) 0 500 1,000 1,500 2,000 2,500 Study Day 14 Pl at el et s (X 10 3 c el ls /u L) Vehicle FHT-EP300d, 50mg/kg, sc, BID Dual BD inhibitor, 30mg/kg, p.o, BID FHT-EP300d Dual CBP/EP300 Inhibitor Vehicle
Selective ARID1B Protein Degrader For ARID1A Mutated Cancers
| ARID1B is a Major Synthetic Lethal Target Implicated in Up To 5% of All Solid Tumors 42* Per year incidence in the U.S., EU5, Japan. Source: Clarivate DRG Mature Markets Data. Target / Approach • ARID1B • Targeted protein degrader Initial Indication • ARID1A mutated cancers Mutation / Aberration • ARID1A mutations (e.g., ovarian, endometrial, colorectal, bladder and other cancers) Stage • Pre-clinical New Patients Impacted / Year* • > 175,000 ARID1A ARID1B ~5% of all solid tumors harbor ARID1A mutations Uterine Bladder Stomach Cholangiocarcinoma Liver Esophageal Ovarian Colorectal Melanoma 0% 10% 20% 30% 40% Commercial Opportunity % of Patients with ARID1A Mutation
| Compound Screening and Structure-Based Optimization Yielded Selective ARID1B Binders 43 • Mapped and purified several potential ligandable regions of ARID, which were then screened against various compound libraries • Characterized binding using multiple biochemical and biophysical techniques: e.g., DSF, ASMS, NMR, and SPR • Determined X-ray crystal structure of ARID ligandable domains with specific binders • Leveraged these structures to drive binding affinities and expand binding chemotypes Identification of Selective ARID1B Binders X-Ray Crystal Structures Detail Selective ARID1B Binding
| Structure-Based Optimization Drove Improved ARID1B Binding Affinity from 100 uM to less than 200 nM 44 1.4 Å co-xtal structure 2.0 Å soak structure 1.7 Å soak structure ARIDb-2 ARID1B Kd: 15 uM ARIDb-1 ARID1B Kd: 100 uM ARIDb-3 ARID1B Kd: 0.5 uM ARIDb-9 ARID1B Kd: 0.2 uM 1.9 Å co-xtal structure 1 10 100 1000 0.0 0.2 0.4 0.6 0.8 1.0 FHT-0074317-001 [Compound] uM Ta rg et e ng ag em en t 1 10 100 1000 0.0 0.2 0.4 0.6 0.8 1.0 FHT-0074421-001 [Compound] uM Ta rg et e ng ag em en t 1 10 100 1000 0.0 0.2 0.4 0.6 0.8 1.0 FHT-0081169-001 [Compound] uM Ta rg et e ng ag em en t 1 10 100 1000 0.0 0.2 0.4 0.6 0.8 1.0 FHT-0067367-003 [Compound] uM Ta rg et e ng ag em en t Gen 1: Screening Hit Gen 2: Early Optimization Gen 3: Sub-uM Affinity
| … with Multiple Near-Term Value Inflection Points through 2026 45 Q4 2024AML Combination Dose Escalation Data FHD-286 October 2024Phase 1: First Patient DosedFHD-909 (Selective SMARCA2 Inhibitor) ConfidentialIND Filing / Phase 1 InitiationSelective SMARCA2 Degrader Year End 2024Initiate IND-Enabling StudiesSelective CBP Degrader 2025Initiate IND-Enabling StudiesSelective EP300 Degrader ConfidentialTarget Disclosure and IND FilingLilly Target #2 H1 2026Development CandidateSelective ARID1B Degrader SMARCA2 = BRM SMARCA4 = BRG1 ConfidentialPhase 1 Dose Escalation Data
| Developing First-In-Class Precision Medicines Targeting Major Unmet Needs in Cancer 46 Large Market Potential Chromatin biology is implicated in up to 50% of tumors, potentially impacting ~2.5 million patients Foghorn’s current pipeline potentially addresses more than 500,000 of these patients Broad pipeline across a range of targets and small molecule modalities Major Strategic Collaboration Strategic collaboration with Lilly; $380 million upfront; 50/50 U.S. economic split on two lead programs Well- Funded $267.4 million in cash and equivalents (as of 9/30/2024) Cash runway into 2027 Shares outstanding: approximately 62.5M* Value Drivers Anticipate data from the Phase 1 trial of FHD-286 in combination with decitabine in Q4’24 SMARCA2 Selective Inhibitor (FHD-909), partnered with Lilly, in Phase 1 trial Advancement of preclinical assets (SMARCA2 Selective Degrader, CBP, EP300, ARID1B) towards INDs Leader in Unique Area of Cancer Biology Foghorn is a leader in targeting chromatin biology, which has the potential to address underlying dependencies of many genetically defined cancers Platform with initial focus in oncology, therapeutic area expansion potential *Includes common shares outstanding as of 6/30/2024 as well as common stock and pre-funded warrants issued as part of May 2024 financing
November 2024 Unique biology Precision therapeutics Broad impact
Appendix
| Lilly Collaboration Validates Foghorn Approach: Significant Upfront and Deal Economics 49 $380 Million Up-front $300 million cash $80 million in Foghorn common stock at a price of $20 per share Three Undisclosed Discovery Programs Option to participate in a percentage of the U.S. economics Tiered ex-U.S. royalties from the mid-single digit to low- double digit range $1.3 billion in potential milestones 50/50 U.S. Economics on Two Programs 50/50 U.S. economic split on SMARCA2-Selective and another undisclosed program Tiered ex-U.S. royalties starting in the low double-digit range and escalating into the twenties based on revenue levels
FHD-286: Dual SMARCA2 / SMARCA4 Inhibition Targeting BAF Dependency in Cancer Additional Information
| Potential First-in-Class Mutation-Agnostic Differentiation Agent With Significant Combination Potential in AML 51 Completed Phase I Monotherapy Safety and Efficacy Results Ongoing Phase I Combination Trial Efficacy • Differentiation observed in heavily pre-treated patients, regardless of mutational status • Multiple patients with bone marrow and peripheral blast improvements and associated ANC recovery Safety • Adverse data observed to be profile consistent with late- line AML population • Most frequent ≥ grade 3 TRAEs: increased blood bilirubin, hypocalcemia, differentiation syndrome (DS), stomatitis, increased ALT • Adjudicated Differentiation Syndrome rate of 15% • Phase I dose escalation trial evaluating oral daily dosing of FHD-286 with fixed dose decitabine or cytarabine • Standard 3+3 dose escalation design • Data anticipated in H2’2024
| Peripheral Blood and Bone Marrow Blast Count Reduction Led to ANC Recovery in a Subset of Patients 52* MDS Patient Diagnosis Dose Level Mutations Cytogenetic Risk Cycles on Study ANC Recovery Peripheral Starting Blast % Peripheral Min Blast % Peripheral Blast % Change BMA Starting Blast % BMA Min Blast % BMA Blast % Change AML 10mg N/A Adverse 2.2 YES 15 0 (100) 40 6 (85) AML 10mg DNMT3A, U2AF1, DDX41, CUX1, TP53 Adverse 0.5 N 20 0 (100) 13 2 (85) AML 10mg NRAS, SF3B1 Intermediate 7.3 N 2 0 (100) 12 5 (58) AML 10mg NRAS, BRCA1, MEN1, CDKN1Ap Adverse 0.3 N 80 11 (86) 52 - - AML 10mg D17Z1, TP53 Intermediate 0.6 N 9 1 (89) 9 - - AML 10mg GATA2, ETV6, KDR Intermediate 1.4 N 2 2 0 5 - - AML 7.5mg RUNX1, KRAS, ASXL1, JAK2, TET2, EZH2, ETNK1 Intermediate 2.9 N 83 1 (99) 83 2 (98) AML 7.5mg ASXL1, TP53, U2AF1 Adverse 1.3 N - 5 - 36 14 (61) AML 7.5mg KMT2A rearrangement Adverse 2.8 YES 97 5 (95) 89 48 (46) AML 7.5mg N/A Adverse 4.1 YES 28 4 (86) 25 15 (40) MDS 7.5mg DNMT3A, TP53 Adverse 1.4 N - 0 - 8 5 (38) AML 7.5mg DNMT3A, KRAS, NRAS Adverse 1.8 N 32 2 (94) 47 49 4 AML 7.5mg CBFB (locus at 16q22) Favorable 1.7 YES 32 0 (100) 27 29 7 AML 7.5mg N/A Adverse 0.1 N 35 19 (46) 72 - - AML 7.5mg ASXL1, BCOR, FLT3ITD, NF1, CBL, H1-B, NFE2 Adverse 0.7 N 8 7 (13) 25 - - AML 7.5mg N/A - 0.5 N 0 0 0 8 - - AML 7.5mg NRAS, ASXL2, SRSF2 Adverse 0.1 N 93 - - 17 - - AML 7.5mg ASXL1, DNMT3A, TET2, TP53 Adverse 0.5 N - 4 - - - - AML 7.5mg FLT3ITD Favorable 0.8 N 0 39 - 12 - - *
| Peripheral Blood and Bone Marrow Blast Count Reduction Leading to ANC Recovery in a Subset of Patients 53* MDS Patient Diagnosis Dose Level Mutations Cytogenetic Risk Cycles on Study ANC Recovery Peripheral Starting Blast % Peripheral Min Blast % Peripheral Blast % Change BMA Starting Blast % BMA Min Blast % BMA Blast % Change AML 5mg RUNX1, NRAS, ASLX1 Adverse 3.1 YES 29 0 (100) 35 12 (66) AML 5mg N/A Adverse 8.0 N - 2 - 11 7 (36) AML 5mg N/A Adverse 1.8 YES 6 0 (100) 24 16 (33) AML 5mg ASXL1, DNMT3A, KRAS, PTPN11, WT1, GRIN2AWT1 Adverse 2.0 N 32 38 19 49 52 6 MDS 5mg RUNX1, NRAS, KRAS, SF3B1, ASXL2, CSF3R, GATA2 Adverse 1.0 YES 5 13 160 11 14 27 MDS 5mg DNMT3a, TET2 Intermediate 1.9 YES 0 0 0 1 2 100 AML 5mg TET2, WT1, GATA2, PLCG2, ARHGEF28, BRD4, CDK12, DDX41, KMT20, PARP1, ZRSR2 Intermediate 1.7 YES 9 0 (100) 18 46 156 AML 5mg KRAS, PTNP11, IRF8, MSH6, RUNX1 - 1.3 N 17 7 (59) - 80 - AML 5mg TP53 Adverse 0.7 N 41 20 (51) 18 - - AML 5mg TP53 Adverse 0.5 N 44 35 (20) 55 - - AML 5mg PPM1D, TP53 Adverse 0.5 N 15 12 (20) 18 - - AML 5mg KRAS, TET2 Adverse 0.6 N 37 32 (14) 56 - - MDS 5mg ASXL1, DNMT3A, IDH1, SRSF2, SF3B1, TET2 - 0.4 N 0 0 0 0 - - AML 5mg N/A Adverse 0.5 N 10 11 13 - - - AML 5mg ASXL1, NRAS, EP300, STAG2, RUNX1, TET2 Adverse 0.1 N 25 32 25 11 - - AML 5mg CEBPA, KMT2C, NCOR1, CBL - 0.3 N 48 75 56 64 - - AML 2.5mg NRAS, WT1 Adverse 1.4 N 36 62 72 45 74 64 AML 2.5mg BCR/ABL, PMLRARA, RUNX1, TET2 - 2.4 N 68 28 (59) 30 - - AML 2.5mg N/A Adverse 0.8 N 7 0 (100) 22 - - AML 2.5mg DNMT3A, KRAS, TP53 Adverse 0.8 N 28 40 46 45 - - AML 2.5mg DNMT3A, TP53 Adverse 1.0 N 4 - 25 - * * *
| Bone Marrow Aspirate: Clear Evidence of Differentiation Bone Marrow Blast Reduction from 40% to 6% Signs of Differentiation in Heavily Pre-Treated, Secondary AML Patient with Abnormal Karyotype in Phase 1 Dose Escalation Trial 54 Patient Background: • 47-year-old male, secondary AML • Abnormal karyotype: Del (7Q), Inv (3), Der (7;12), -8, ADD(1) Prior AML Treatment: • Progressive disease: 4 lines prior treatment and 2 bone marrow transplants Prior non-AML treatment: • MDS with inv(3) and der(7;12) and ASXL1 mut. Received AZA x 4. Initiation of FHD-286 at 10 MG Dose: • Bone marrow blast from 40% to 6% with clear evidence of differentiation with persistence of cytogenetics abnormalities. ANC recovery.
| Absolute Neutrophil Count (ANC) Peripheral Blast Count Clinical Benefit in Heavily Pre-Treated Patient in Phase 1 Dose Escalation Trial 55 100% 0% 50% 10 5 10/13/21 10/24/21 11/4/21 11/14/21 11/25/21 12/6/21 0 Initiation of FHD 286 1st SCT 2nd SCT Patient Background: • 25-year-old male, treatment-related AML • KMT2A rearrangement Prior AML Treatment: • Progressive disease with CNS Leukemia: 7 lines prior treatment and 2 bone marrow transplants Prior non-AML treatment: • Ewing’s sarcoma: Treated with Chemo/RT/Surgery (VCR, doxo, cyclophos, ifos, etoposide) Initiation of FHD-286 at 10 MG Dose: • Drop in peripheral blast, 97% to 5% • Bone marrow reduction from 89% to 48%, with ANC recovery 5/23/19 11/22/19 5/22/20 5/23/2111/21/20 11/22/21 Initiation of FHD 286
Transcription Factors A Novel Approach FHD-609 is a Selective, Potent, Protein Degrader of the BRD9 component of the BAF complex
| Foghorn’s Novel Approach to Drugging Transcription Factors Enabled by Its Protein Production and Discovery Capabilities 57 • Highly involved in gene expression • Implicated in range of cancers and other diseases • Featureless surface: no druggable binding pocket • Tight interactions with DNA: undruggable affinities • Druggable binding pockets • Druggable affinities Transcription Factors are Compelling Drug Targets… …But Historically Difficult to Target… Foghorn Has a New Approach Focusing on Interaction with BAF HISTORICAL FOCUS POTENTIAL DRUGGABLE SITES FOGHORN’S FOCUS
| Transcription Factors Bind to BAF Directly with Specificity; Unique Insights into Where and How Transcription Factors Bind 58 Mass spec. foot-printing Pull-down assays Foghorn’s collection of BAF sub-complexes and domains Biophysical Biochemical Structural AUC / SPR / ITC TR-FRET / FP Crystal / NMR SPI1 Mapping the TF-BAF Interaction Validating the TF-BAF Interaction SPI1 TF B TF C TF D
November 2024 Unique biology Precision therapeutics Broad impact