Last update 21 Mar 2024

Acute myeloid leukemia with multilineage dysplasia

Last update 21 Mar 2024

Basic Info

Synonyms

AML with Multilineage Dysplasia, AML with multilineage dysplasia, AML with myelodysplasia-related features

+ [9]

Introduction

An acute myeloid leukemia arising de novo and not as a result of treatment. It is characterized by the presence of myelodysplastic features in at least 50% of the cells of at least two hematopoietic cell lines. Patients often present with severe cytopenia.

Clinical Trials associated with Acute myeloid leukemia with multilineage dysplasia

NCT04869683 / RecruitingNot ApplicableIIT

Biocollection in Patients With Myelodysplastic Syndrome (P-MDS)

Myelodysplastic syndromes (MDS) are chronic myeloid hemopathies characterized by ineffective hematopoiesis (with peripheral cytopenias) and which contrast with a marrow of normal richness. MDS is considered one of the four most common blood diseases. The incidence is estimated at 4,059 cases / year in 2012 with an average age of 78 years in men and 81 years in women (INCA report, Cancers in France in 2015). The incidence increases with lengthening of the lifespan. The main risk of MDS is transformation to acute leukemia in 30 to 40% of cases. Treatment options depend on clinical, hematologic and chromosomal abnormalities. The prognosis is considered to be at low or high risk of developing acute leukemia. This distinction will therefore have an impact on the therapeutic solution (s). MDS exhibit clinical, morphological and genetic heterogeneity. It is therefore necessary to form subgroups of patients to better understand the physiopathogenesis of this pathology. The constitution of a biocollection will make it possible to search for clinical and biological prognostic markers in order to identify patients progressing to acute myeloid leukemia.

Start Date19 Oct 2022

Sponsor / Collaborator

University Hospital of Brest

NCT04802161 / RecruitingPhase 2IIT

Randomized Phase 2 Study of Daunorubicin and Cytarabine Liposome + Pomalidomide Versus Daunorubicin and Cytarabine Liposome in Newly Diagnosed AML With MDS-Related Changes

This phase II trial studies the effect of adding pomalidomide to usual chemotherapy treatment (daunorubicin and cytarabine liposome) in treating patients with newly diagnosed acute leukemia with myelodysplastic syndrome-related changes. Pomalidomide may stop the growth of blood vessels, stimulate the immune system, and kill cancer cells. Chemotherapy drugs, such as daunorubicin and cytarabine liposome, work in different ways to stop the growth of cancer cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Adding pomalidomide to chemotherapy treatment with daunorubicin and cytarabine liposome may be effective in improving some treatment outcomes in patients with newly diagnosed acute leukemia with myelodysplastic syndrome-related changes.

Start Date24 Aug 2022

Sponsor / Collaborator

National Cancer Institute

NCT03047993 / CompletedPhase 1/2IIT

Phase Ib/II Study of the Glutaminase Inhibitor CB-839 in Combination With Azacitidine in Patients With Advanced Myelodysplastic Syndrome

This phase I/II trial studies the side effects of glutaminase inhibitor CB-839 in combination with azacitidine in treating patients with myelodysplastic syndrome that has spread to other places in the body. Glutaminase inhibitor CB-839 and azacitidine may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.

Start Date15 Nov 2017

Sponsor / Collaborator

The University of Texas MD Anderson Cancer Center

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100 Clinical Results associated with Acute myeloid leukemia with multilineage dysplasia

100 Translational Medicine associated with Acute myeloid leukemia with multilineage dysplasia

0 Patents (Medical) associated with Acute myeloid leukemia with multilineage dysplasia

221

Literatures (Medical) associated with Acute myeloid leukemia with multilineage dysplasia

08 Feb 2024·Clinical and experimental medicine

The clinical outcomes of haploidentical stem cell transplantation (haplo-HSCT) for patients with therapy-related myelodysplastic syndrome: comparable to de novo myelodysplastic syndrome.

Article

Author: Feifei Tang ; Yunqi Wang ; Yu Wang ; Jian Jin ; Wei Han ; Yuhong Chen ; Chenhua Yan ; Lanping Xu ; Xiaohui Zhang ; Xiaojun Huang

Therapy-related myelodysplastic syndrome (t-MDS) is defined as a complication in patients with cancer following exposure to chemotherapy and/or radiotherapy and has an inferior outcome compared with de novo myelodysplastic syndrome (de novo MDS). This study aimed to estimate and compare the clinical outcomes of haploidentical stem cell transplantation (haplo-HSCT) for t-MDS and de novo MDS. We retrospectively analyzed 96 patients with MDS who received haplo-HSCT between January 2015 and December 2021. Eleven patients with t-MDS and 85 patients with de novo MDS were matched using the case-pair method in a 1:8 ratio with the following pairing criteria: (1) sex, (2) age (± 5 years), (3) year of haplo-HSCT (± 2 years), and (4) blast cell counts (≥ 5% or not). The 3-year overall survival and disease-free survival after haplo-HSCT for t-MDS versus de novo MDS patients were 72.7% versus 75.1% (P = 0.99) and 54.5% versus 67.0% (P = 0.50), respectively. The 3-year cumulative incidence of relapse was 36.4% versus 15.5% (P = 0.08), respectively. In multivariate analysis, there was no difference in relapse between t-MDS and de novo MDS. The 3-year cumulative non-relapse mortality rates were 9.1% versus 17.6% (P = 0.45), respectively. This study confirmed the comparable clinical outcomes of haplo-HSCT on the prognosis of t-MDS and de novo MDS.

28 Jun 2023·Bulletin du cancer

Therapy-related myelodysplastic syndromes in the genomics era.

Review

Author: Aline Renneville ; Elsa Bernard ; Jean-Baptiste Micol

Therapy-related myelodysplastic syndromes (t-MDS) represent a heterogeneous group of malignancies that arise as a late complication of prior exposure to chemotherapy and/or radiotherapy administered for a primary condition. T-MDS account for approximately 20% of all MDS and are characterized by resistance to current treatment strategies and poor prognosis. Our understanding of t-MDS pathogenesis has considerably improved over the last 5 years with the availability of deep sequencing technologies. T-MDS development is now considered as a multifactorial process resulting from complex interactions between an underlying germline genetic susceptibility, the stepwise acquisition of somatic mutations in hematopoietic stem cells, the clonal selection pressure exerted by cytotoxic therapies, and alterations of the bone marrow microenvironment. The survival of patients with t-MDS is generally poor. This can be explained by both patient-related factors including poor performance status and less tolerance to treatment and disease-related factors, such as the presence of chemoresistant clones, high-risk cytogenetic alterations and molecular features (e.g. high frequency of TP53 mutations). Around 50% of t-MDS patients are classified as high/very high risk based on IPSS-R or IPSS-M scores, versus 30% in de novo MDS. Long-term survival is only achieved in a minority of t-MDS patients who receive allogeneic stem cell transplantation, but the development of novel drugs may open new therapeutic opportunities, especially in unfit patients. Further investigations are needed to improve the identification of patients at higher risk of developing t-MDS and determine whether primary disease treatment can be modified to prevent the occurrence of t-MDS.

17 Mar 2023·Leukemia

Therapy-related MDS dissected based on primary disease and treatment-a nationwide perspective.

Article

Author: Daniel Moreno Berggren ; Hege Garelius ; Petter Willner Hjelm ; Lars Nilsson ; Bengt Rasmussen ; Caroline E Weibull ; Mats Lambe ; Sören Lehmann ; Eva Hellström-Lindberg ; Martin Jädersten ; Elisabeth Ejerblad

In this population-based study, we aimed to characterize and compare subgroups of therapy-related Myelodysplastic syndromes (t-MDS) and define the implications of type of previous treatment and primary disease. We combined data from MDS patients, diagnosed between 2009 and 2017 (n = 2705), in the nationwide Swedish MDS register, with several health registers. Furthermore, using matched population controls, we investigated the prevalence of antecedent malignancies in MDS patients in comparison with the general population. This first ever nationwide study on t-MDS confirms a shorter median survival for t-MDS compared to de novo MDS (15.8 months vs 31.1 months, p < 0.001). T-MDS patients previously treated with radiation only had disease characteristics with a striking resemblance to de novo-MDS, in sharp contrast to patients treated with chemotherapy who had a significantly higher risk profile. IPSS-R and the WHO classification differentiated t-MDS into different risk groups. As compared with controls, MDS patients had a six-fold increased prevalence of a previous hematological malignancy but only a 34% increased prevalence of a previous solid tumor. T-MDS patients with a previous hematological malignancy had a dismal prognosis, due both to mortality related to their primary disease and to high-risk MDS.

News (Medical) associated with Acute myeloid leukemia with multilineage dysplasia

07 Mar 2024

·www.globenewswire.com

Foghorn Therapeutics Provides Financial Update for 2023 and 2024 Strategic Outlook

• Dose escalation in FHD-286 combination study in AML continues to progress; clinical data anticipated in the second half of 2024 • FHD-909, a first-in-class BRM selective inhibitor, selected for clinical development by partner Lilly; preclinical data to be presented at AACR with IND planned for the second quarter, primary target patient population in non-small cell lung cancer • Selective CBP and EP300 degrader preclinical data to be presented at AACR; IND-enabling studies for CBP degrader program planned to begin by end of 2024 • Foghorn anticipates at least six new INDs targeting significant oncology patient populations over the next four years, reflecting the continued productivity of its precision medicine platform • Cash, cash equivalents, and marketable securities of $234.1 million, as of December 31, 2023, provide cash runway into the first half of 2026 CAMBRIDGE, Mass., March 07, 2024 (GLOBE NEWSWIRE) -- 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 update and corporate outlook in conjunction with the Company’s 10-K filing for the year ending December 31, 2023. 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 with a wide spectrum of diseases. “The research and clinical advances we made in 2023 set the stage for Foghorn to deliver significant value with the potential for several differentiated, high-impact medicines in 2024 and beyond,” said Adrian Gottschalk, President and Chief Executive Officer of Foghorn. “In 2023 we initiated a combination study with FHD-286 in AML, with data anticipated in the second half of 2024. Based on the mutation-agnostic differentiation effect observed in our single-agent escalation study, we believe FHD-286 has the potential to be a first-in-class broad-based differentiation therapeutic in AML. We are also making progress with our selective BRM program with FHD-909, a first-in-class BRM selective inhibitor, selected for clinical development by partner Lilly. The IND is planned for the second quarter of 2024, with an initial focus in non-small cell lung cancer. Finally, we are excited by the preclinical efficacy and safety data for our CBP and EP300 selective degrader programs and target IND-enabling studies for CBP by the end of the year. Our cash position remains strong with runway into the first half of 2026.” Key Recent Updates and Upcoming Milestones FHD-286. FHD-286 is a potent, selective inhibitor of the BRG1 and BRM subunits of the BAF chromatin remodeling complex where dependency on BRG1/BRM is well-established preclinically with multiple tumor types, including acute myelogenous leukemia (AML)/myelodysplastic syndrome (MDS), non-small cell lung cancer (NSCLC) and prostate cancer. AML Update. Foghorn commenced a Phase 1 study of FHD-286 in combination with decitabine or low-dose cytarabine (LDAC) in relapsed and/or refractory AML patients, with the first patient dosed during the third quarter of 2023. Dose escalation is ongoing, and the first clinical data are expected in the second half of 2024.TKI Resistance. Recently published data, along with Foghorn’s work, suggest that FHD-286 may play an important role in overcoming resistance in EGFR/KRAS tumors. The Company is conducting preclinical work to further explore the opportunity and expects data in the second quarter of 2024. Differentiated Pipeline Advancement. Foghorn continues to expand its platform and pipeline. The Company anticipates the potential for six new investigational new drug (IND) applications in the next four years. The Company continues to progress programs for multiple targets that include chromatin remodeling complexes, transcription factors, helicases, and other chromatin-related factors. These targets include selective BRM and wholly owned programs including CBP, EP300, and ARID1B, as well as other undisclosed targets, which combined could address more than 20 tumor types impacting more than 500,000 new patients annually. Selective CBP and Selective EP300 programs. Foghorn is presenting new preclinical data for its CBP and EP300 selective degrader programs at the 2024 AACR Annual Meeting, April 5-10, 2024. CBP selective degraders have shown significant tumor growth inhibition in a colorectal cancer in vivo model. Antiproliferative effects were also observed for numerous cancer cell lines, including colorectal, gastric and bladder cancers.EP300 selective degraders have shown potent cellular antiproliferation and in vivo tumor growth inhibition in an AR+ enzalutamide prostate in vivo model.At preclinical efficacious doses, neither the CBP nor the EP300 selective degraders cause thrombocytopenia, a commonly observed safety liability for dual CBP/EP300 inhibitors. Lilly Collaboration. Foghorn is engaged in a strategic collaboration with Lilly and continues to advance the BRM selective inhibitor and degrader programs along with other undisclosed programs. In the first quarter of 2024, Lilly selected FHD-909, a first-in-class oral BRM selective inhibitor, for clinical development. Lilly plans to file an IND for FHD-909 in the second quarter of 2024. The primary target patient population is BRG1-mutated NSCLC.Selective BRM inhibition has been a sought-after objective in cancer research for many years. A variety of tumor types, including NSCLC, are known to have mutations in BRG1, which we believe make them dependent on BRM activity for their survival. Selective blocking of BRM activity is considered a promising strategy for causing tumor cell death while sparing healthy cells.Preclinical data will be presented in 2024, including at AACR with a poster presentation on April 8. In December 2021, Foghorn announced a strategic collaboration with Lilly to create novel oncology medicines. The collaboration includes a co-development and co-commercialization agreement for Foghorn’s Selective BRM oncology program and an additional undisclosed oncology target. In addition, the collaboration includes three discovery programs using Foghorn’s proprietary Gene Traffic Control platform. Full Year 2023 Financial Highlights Collaboration Revenues. Collaboration revenues were $34.2 million for the year ended December 31, 2023, compared to $19.2 million for the year ended December 31, 2022. The increase year-over-year was primarily driven by revenue recognized under the Merck collaboration due to the termination of the agreement and the subsequent recognition of the remaining deferred revenue.Research and Development Expenses. Research and development expenses were $109.7 million for the year ended December 31, 2023, compared to $105.6 million for the year ended December 31, 2022. This increase was primarily due to costs associated with continued investment in R&D personnel, platform, and other early-stage research, partially offset by a decrease in spend on FHD-286 and FHD-609.General and Administrative Expenses. General and administrative expenses were $32.4 million for the year ended December 31, 2023, compared to $30.7 million for the year ended December 31, 2022. This increase was primarily due to an increase in investments to support the growing business, which included increases in personnel-related costs and stock-based compensation expense.Net Loss. Net loss was $98.4 million for the year ended December 31, 2023, compared to a net loss of $108.9 million for the year ended December 31, 2022.Cash, cash equivalents and marketable securities. As of December 31, 2023, the Company had $234.1 million in cash, cash equivalents and marketable securities, providing cash runway into the first half of 2026. About FHD-286 FHD-286 is a highly potent, selective, allosteric, and orally available small-molecule, enzymatic inhibitor of BRG1 (SMARCA4) and BRM (SMARCA2), 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 AMLAdult 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-909FHD-909 (a.k.a. LY4050784) is a highly potent, allosteric and orally available small molecule that selectively inhibits the ATPase activity of BRM (SMARCA2) over its closely related paralog BRG1 (SMARCA4), 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 BRG1 rely on BRM for BAF function. FHD-909 has shown significant anti-tumor activity across multiple BRG1-mutant lung tumors. About Foghorn TherapeuticsFoghorn® 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 StatementsThis press release contains “forward-looking statements.” Forward-looking statements include statements regarding the Company’s clinical trials, product candidates 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) Dec. 31, 2023 Dec. 31, 2022Cash, cash equivalents and marketable securities$234,057 $345,798Collaboration receivable — —All other assets 51,859 59,085Total assets$285,916 $404,883Deferred revenue, total$302,665 $336,820All other liabilities 60,441 67,951Total liabilities 363,106 404,771Total stockholders’ equity (77,190) 112Total liabilities and stockholders’ equity$285,916 $404,883 Condensed Consolidated Statements of Operations(In thousands, except share and per share amounts) Twelve Months Ended December 31, 2023 2022 Collaboration revenue$34,155 $19,228 Operating expenses: Research and development 109,689 105,618 General and administrative 32,372 30,747 Total operating expenses 142,061 136,365 Loss from operations (107,906) (117,137)Total other income, net 13,706 8,255 Loss before income taxes (94,200) (108,882)Provision for income taxes (4,226) — Net loss$(98,426) $(108,882)Net loss per share attributable to common stockholders—basic and diluted$(2.34) $(2.62)Weighted average common shares outstanding—basic and diluted 41,974,484 41,591,433 Contacts:Greg Dearborn, Foghorn Therapeutics Inc. (Investors) gdearborn@foghorntx.com Karin Hellsvik, Foghorn Therapeutics Inc. (Investors and Media) khellsvik@foghorntx.com Adam Silverstein, ScientPR (Media) adam@scientpr.com Peter Kelleher, LifeSci Advisors (Investors) pkelleher@lifesciadvisors.com

Phase 1Financial StatementAACR

08 Jan 2024

·www.globenewswire.com

Foghorn Therapeutics Highlights Clinical Program Updates and Research Progress and Provides Strategic Objectives for 2024

- FHD-286 combination study in AML continues to progress in the clinic with data anticipated in the second half of 2024; preclinical combination data with FHD-286 and tyrosine kinase inhibitors (TKIs) in EGFR/KRAS resistance anticipated by the second quarter of 2024 - BRM selective inhibitor and degrader programs advancing in partnership with Loxo@Lilly - Preclinical efficacy and safety demonstrated with selective EP300 and CBP programs; additional preclinical data anticipated in the second quarter of 2024; targeting IND enabling studies for CBP before end of 2024 - Foghorn anticipates at least six new INDs targeting significant oncology patient populations over the next four years, reflecting the continued productivity of its precision medicine platform - Cash, cash equivalents, and marketable securities of $259.9 million, as of September 30, 2023, provides cash runway into the first half of 2026 CAMBRIDGE, Mass., Jan. 08, 2024 (GLOBE NEWSWIRE) -- 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 announced its strategic objectives for 2024. “We enter 2024 with several important milestones ahead of us. We anticipate data from our Phase 1 combination study of FHD-286 in AML in the second half of the year and look forward to continued progress with our unique pipeline, including our BRM selective inhibitor and degrader programs in collaboration with Loxo@Lilly,” said Adrian Gottschalk, President and Chief Executive Officer. “We have made significant progress with our preclinical programs, including our selective EP300, CBP and ARID1B degrader programs and are getting ready to share more preclinical data in the first half of the year. This will also include preclinical combination data of FHD-286 with tyrosine kinase inhibitors of EGFR and KRAS. Over the next four years, we anticipate the filing of at least six new INDs, reflecting the productivity of our precision medicine platform. This is all supported by our cash and equivalents position of approximately $259.9 million as of September 30, 2023.” FHD-286. FHD-286 is a potent, selective inhibitor of the BRG1 and BRM subunits of the BAF chromatin remodeling complex where dependency on BRG1/BRM is well-established preclinically with multiple tumor types, including acute myelogenous leukemia (AML)/myelodysplastic syndrome (MDS), non–small cell lung cancer (NSCLC) and prostate cancer. AML Update. Foghorn commenced a Phase 1 study of FHD-286 in combination with decitabine or low-dose cytarabine (LDAC) in relapsed and/or refractory AML patients, with the first patient dosed during the third quarter of 2023. The first clinical data are expected in the second half of 2024.TKI Resistance. Recently published data, along with Foghorn’s work, suggest that FHD-286 may play an important role in overcoming resistance in EGFR/KRAS tumors. The company is conducting preclinical work to further explore the opportunity. Differentiated Pipeline Advancement. Foghorn continues to expand its platform and pipeline. The Company anticipates the potential for six new investigational new drug (IND) applications in the next four years. The Company continues to progress programs for multiple targets that include chromatin remodeling complexes, transcription factors, helicases and other chromatin-related factors. These targets include selective BRM* and wholly owned programs including CBP, EP300, and ARID1B, as well as other undisclosed targets, which combined could address more than 20 tumor types impacting more than 500,000 new patients annually. Selective EP300 and Selective CBP programs. Foghorn presented new preclinical data for its EP300 and CBP selective degrader programs at Hanson Wade’s 6th Annual Targeted Protein Degradation Summit on October 31, 2023. EP300 selective degraders showed potent cellular antiproliferation and in vivo tumor growth inhibition in an AR+ enzalutamide prostate in vivo model.CBP selective degraders demonstrated significant tumor growth inhibition in a colorectal cancer in vivo model. Antiproliferative effects were also observed for numerous cancer cell lines, including colorectal, gastric and bladder cancers.At preclinical efficacious doses, neither the EP300 nor the CBP selective degraders caused thrombocytopenia, a commonly observed safety liability for dual CBP/EP300 inhibitors.Additional preclinical data will be presented in the first half of 2024. *Loxo@Lilly Collaboration. Foghorn is engaged in a strategic collaboration with Loxo@Lilly and continues to advance the BRM selective inhibitor and degrader programs along with other undisclosed programs.Strong Balance Sheet and Cash Runway. As of September 30, 2023, the Company had $259.9 million in cash, cash equivalents and marketable securities providing cash runway into the first half of 2026. 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 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 are 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, including statements regarding potential combination trials involving FHD-286, the progress of our Loxo@Lilly collaboration, and our proprietary pre-clinical programs. 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, 2022, 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. Contacts: Karin Hellsvik, Foghorn Therapeutics Inc. (Media)khellsvik@foghorntx.com Greg Dearborn, Foghorn Therapeutics Inc. (Investors)gdearborn@foghorntx.com Michael Lampe, ScientPR (Media)michael@scientpr.com Peter Kelleher, LifeSci Advisors (Investors)pkelleher@lifesciadvisors.com

Phase 1

02 Nov 2023

·www.biospace.com

Foghorn Therapeutics Provides Third Quarter 2023 Financial and Corporate Update

First patient dosed in FHD-286 combination study in AML; data expected in the second half of 2024 Transitioned the BRM Selective inhibitor program to Loxo@Lilly Presented preclinical data demonstrating tumor growth inhibition and favorable safety profiles for Selective EP300 and Selective CBP programs Cash, cash equivalents, and marketable securities of $259.9 million, as of September 30, 2023, provides cash runway into the first half of 2026 CAMBRIDGE, Mass., Nov. 02, 2023 (GLOBE NEWSWIRE) -- 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, 2023. 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. “During the third quarter, we continued to enroll patients in our FHD-286 combination study in AML and expect to have data in the second half of 2024. Based on the mutation agnostic differentiation effect observed in our single-agent escalation study, we believe FHD-286 has the potential to be a first-in-class broad-based differentiation therapeutic in AML," said Adrian Gottschalk, President and Chief Executive Officer of Foghorn. "We also made important progress with our Loxo@Lilly collaboration transitioning the BRM Selective inhibitor program to them." Key Recent Updates and Upcoming Milestones FHD-286. FHD-286 is a potent, selective inhibitor of the BRG1 and BRM subunits of the BAF chromatin remodeling complex where dependency on BRG1/BRM is well-established preclinically with multiple tumor types, including acute myelogenous leukemia (AML)/myelodysplastic syndrome (MDS), non–small cell lung cancer (NSCLC) and prostate cancer. AML Update. Foghorn commenced a Phase 1 study of FHD-286 in combination with decitabine or low-dose cytarabine (LDAC) in relapsed and/or refractory AML patients, with the first patient dosed during the third quarter of 2023. Data are expected in the second half of 2024. Differentiated Pipeline Advancement. Foghorn continues to expand its platform and pipeline. The Company anticipates the potential for six new investigational new drug (IND) applications in the next four years. The Company continues to progress programs for multiple targets that include chromatin remodeling complexes, transcription factors, helicases and other chromatin-related factors. These targets include Selective BRM* and wholly owned programs including CBP, EP300, and ARID1B, as well as other undisclosed targets, which combined could address more than 20 tumor types impacting more than 500,000 new patients annually. Selective EP300 and Selective CBP programs. Foghorn presented new preclinical data for its EP300 and CBP selective degrader programs at Hanson Wade’s 6th Annual Targeted Protein Degradation Summit on October 31st. EP300 selective degraders showed potent cellular antiproliferation and in vivo tumor growth inhibition in an AR+ enzalutamide prostate in vivo model. CBP selective degraders demonstrated significant tumor growth inhibition in a colorectal cancer in vivo model. Antiproliferative effects were also observed for numerous cancer cell lines, including colorectal, gastric and bladder cancers. At preclinical efficacious doses, neither the EP300 nor the CBP selective degraders caused thrombocytopenia, commonly observed safety liability for dual CBP/EP300 inhibitors. Loxo@Lilly Collaboration. Foghorn continues to progress its strategic collaboration with Loxo@Lilly. During Q3 2023, the Company transitioned the BRM Selective inhibitor program to Loxo@Lilly. *In December 2021, Foghorn announced a strategic collaboration with Loxo@Lilly to create novel oncology medicines. The collaboration includes a co-development and co-commercialization agreement for Foghorn’s Selective BRM oncology program and an additional undisclosed oncology target. In addition, the collaboration includes three discovery programs using Foghorn’s proprietary Gene Traffic Control platform. Third Quarter 2023 Financial Highlights Strong Balance Sheet and Cash Runway. As of September 30, 2023, the Company had $259.9 million in cash, cash equivalents and marketable securities, which provides cash runway into the first half of 2026. Collaboration Revenues. Collaboration revenue was $17.5 million for the three months ended September 30, 2023, compared to $6.6 million for the three months ended September 30, 2022. The increase year-over-year was primarily driven by revenue realized upon termination of the Merck collaboration. Research and Development Expenses. Research and development expenses were $26.3 million for the three months ended September 30, 2023, compared to $26.9 million for the three months ended September 30, 2022. This decrease was primarily due to costs associated with continued investment in R&D personnel and platform and early-stage research investments, modestly offset by a decline in clinical trial spend. General and Administrative Expenses. General and administrative expenses were $8.3 million for the three months ended September 30, 2023, compared to $8.0 million for the three months ended September 30, 2022. This increase was primarily due to an increase in investments to support the growing business which included increases in personnel-related costs and stock-based compensation expense. Net Loss. Net loss was $14.3 million for the three months ended September 30, 2023, compared to a net loss of $25.8 million for the three months ended September 30, 2022. About FHD-286 FHD-286 is a highly potent, selective, allosteric, and orally available small-molecule, enzymatic inhibitor of BRG1 (SMARCA4) and BRM (SMARCA2), 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 pre-clinical 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 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 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, product candidates 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, 2022, 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, 2023 December 31, 2022 Cash, cash equivalents and marketable securities $ 259,888 $ 345,798 All other assets 53,535 59,085 Total assets $ 313,423 $ 404,883 Deferred revenue, total $ 308,434 $ 336,820 All other liabilities 62,377 67,951 Total liabilities $ 370,811 $ 404,771 Total stockholders’ equity (deficit) $ (57,388) $ 112 Total liabilities and stockholders’ equity $ 313,423 $ 404,883 Condensed Consolidated Statements of Operations (In thousands, except share and per share amounts) Three Months Ended September 30, 2023 2022 Collaboration revenue $ 17,478 $ 6,634 Operating expenses: Research and development 26,251 26,928 General and administrative 8,308 7,965 Total operating expenses $ 34,559 $ 34,893 Loss from operations $ (17,081) $ (28,259) Total other income, net $ 3,474 $ 2,490 Provision for income taxes $ (738) $ — Net loss $ (14,345) $ (25,769) Net loss per share attributable to common stockholders—basic and diluted (0.34) (0.62) Weighted average common shares outstanding—basic and diluted 42,025,938 41,672,621 Contacts: Greg Dearborn, Foghorn Therapeutics Inc. (Investors) gdearborn@foghorntx.com Karin Hellsvik, Foghorn Therapeutics Inc. (Media) khellsvik@foghorntx.com Michael Lampe, ScientPR (Media) michael@scientpr.com Hans Vitzthum, LifeSci Advisors (Investors) hans@lifesciadvisors.com

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