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|Ref Type||Journal Article|
|Authors||Knutson SK, Warholic NM, Wigle TJ, Klaus CR, Allain CJ, Raimondi A, Porter Scott M, Chesworth R, Moyer MP, Copeland RA, Richon VM, Pollock RM, Kuntz KW, Keilhack H|
|Title||Durable tumor regression in genetically altered malignant rhabdoid tumors by inhibition of methyltransferase EZH2.|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|Date||2013 May 07|
|Abstract Text||Inactivation of the switch/sucrose nonfermentable complex component SMARCB1 is extremely prevalent in pediatric malignant rhabdoid tumors (MRTs) or atypical teratoid rhabdoid tumors. This alteration is hypothesized to confer oncogenic dependency on EZH2 in these cancers. We report the discovery of a potent, selective, and orally bioavailable small-molecule inhibitor of EZH2 enzymatic activity, (N-((4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-5-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-4-methyl-4'-(morpholinomethyl)-[1,1'-biphenyl]-3-carboxamide). The compound induces apoptosis and differentiation specifically in SMARCB1-deleted MRT cells. Treatment of xenograft-bearing mice with (N-((4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-5-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-4-methyl-4'-(morpholinomethyl)-[1,1'-biphenyl]-3-carboxamide) leads to dose-dependent regression of MRTs with correlative diminution of intratumoral trimethylation levels of lysine 27 on histone H3, and prevention of tumor regrowth after dosing cessation. These data demonstrate the dependency of SMARCB1 mutant MRTs on EZH2 enzymatic activity and portend the utility of EZH2-targeted drugs for the treatment of these genetically defined cancers.|
|Molecular Profile||Treatment Approach|
|Gene Name||Source||Synonyms||Protein Domains||Gene Description||Gene Role|
|Drug Name||Trade Name||Synonyms||Drug Classes||Drug Description|
|Tazemetostat||Tazverik||EPZ6438|E-7438|EPZ-6438||EZH2 inhibitor 19||Tazverik (tazemetostat) binds to and inhibits EZH2, resulting in decreased tri-methylation of H3K27, and potentially leading to inhibition of cell proliferation and tumor growth (PMID: 23620515). Tazverik (tazemetostat) is FDA approved for use in patients aged 16 years and older with metastatic or locally advanced epithelioid sarcoma not eligible for complete resection, and in adult patients with relapsed or refractory follicular lymphoma (R/R FL) harboring an EZH2 mutation after 2 prior therapies, and in patients with R/R FL without treatment options (FDA.gov).|
|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|