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Ref Type Journal Article
PMID (25686104)
Authors Bitler BG, Aird KM, Garipov A, Li H, Amatangelo M, Kossenkov AV, Schultz DC, Liu Q, Shih IeM, Conejo-Garcia JR, Speicher DW, Zhang R
Title Synthetic lethality by targeting EZH2 methyltransferase activity in ARID1A-mutated cancers.
Journal Vol Issue Date Pages Journal Short Title
Nature medicine 21 3 2015 Mar 231-8 Nat Med
URL
Abstract Text The gene encoding ARID1A, a chromatin remodeler, shows one of the highest mutation rates across many cancer types. Notably, ARID1A is mutated in over 50% of ovarian clear cell carcinomas, which currently have no effective therapy. To date, clinically applicable targeted cancer therapy based on ARID1A mutational status has not been described. Here we show that inhibition of the EZH2 methyltransferase acts in a synthetic lethal manner in ARID1A-mutated ovarian cancer cells and that ARID1A mutational status correlated with response to the EZH2 inhibitor. We identified PIK3IP1 as a direct target of ARID1A and EZH2 that is upregulated by EZH2 inhibition and contributed to the observed synthetic lethality by inhibiting PI3K-AKT signaling. Importantly, EZH2 inhibition caused regression of ARID1A-mutated ovarian tumors in vivo. To our knowledge, this is the first data set to demonstrate a synthetic lethality between ARID1A mutation and EZH2 inhibition. Our data indicate that pharmacological inhibition of EZH2 represents a novel treatment strategy for cancers involving ARID1A mutations.

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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
GSK126 GSK126 0 1
Drug Name Trade Name Synonyms Drug Classes Drug Description
GSK126 GSK2816126|GSK-126 EZH2 inhibitor 20 GSK126 selectively inhibits EZH2, resulting in decreased H3K27 tri-methylation, and potentially leading to decreased tumor cell proliferation and reduced tumor growth (PMID: 23051747, PMID: 25686104, PMID: 31471312).
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