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Ref Type Journal Article
PMID (38315003)
Authors Kazansky Y, Cameron D, Mueller HS, Demarest P, Zaffaroni N, Arrighetti N, Zuco V, Kuwahara Y, Somwar R, Ladanyi M, Qu R, de Stanchina E, Dela Cruz FS, Kung AL, Gounder MM, Kentsis A
Title Overcoming clinical resistance to EZH2 inhibition using rational epigenetic combination therapy.
Journal Vol Issue Date Pages Journal Short Title
Cancer discovery 2024 Feb 05 Cancer Discov
URL
Abstract Text Epigenetic dependencies have become evident in many cancers. Based on antagonism between BAF/SWI/SNF and PRC2 in SMARCB1-deficient sarcomas, we recently completed the clinical trial of the EZH2 inhibitor tazemetostat. However, the principles of tumor response to epigenetic therapy in general, and tazemetostat in particular, remain unknown. Using functional genomics and diverse experimental models, we define molecular mechanisms of tazemetostat resistance in SMARCB1-deficient tumors. We found distinct acquired mutations that converge on the RB1/E2F axis and decouple EZH2-dependent differentiation and cell cycle control. This allows tumor cells to escape tazemetostat-induced G1 arrest, suggests a general mechanism for effective therapy, and provides prospective biomarkers for therapy stratification, including PRICKLE1. Based on this, we develop a combination strategy to circumvent tazemetostat resistance using bypass targeting of AURKB. This offers a paradigm for rational epigenetic combination therapy suitable for translation to clinical trials for epithelioid sarcomas, rhabdoid tumors, and other epigenetically dysregulated cancers.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References