EPZ011989, A Potent, Orally-Available EZH2 Inhibitor with Robust in Vivo Activity

ACS Med Chem Lett. 2015 Mar 4;6(5):491-5. doi: 10.1021/acsmedchemlett.5b00037. eCollection 2015 May 14.


Inhibitors of the protein methyltransferase Enhancer of Zeste Homolog 2 (EZH2) may have significant therapeutic potential for the treatment of B cell lymphomas and other cancer indications. The ability of the scientific community to explore fully the spectrum of EZH2-associated pathobiology has been hampered by the lack of in vivo-active tool compounds for this enzyme. Here we report the discovery and characterization of EPZ011989, a potent, selective, orally bioavailable inhibitor of EZH2 with useful pharmacokinetic properties. EPZ011989 demonstrates significant tumor growth inhibition in a mouse xenograft model of human B cell lymphoma. Hence, this compound represents a powerful tool for the expanded exploration of EZH2 activity in biology.

Keywords: B cell lymphoma; EZH2; KARPAS-422; Methyltransferase; PRC2; in vivo chemical probe; xenograft.