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GSK126 is an inhibitor of EZH2 with Ki Value of 93 pM [1].

Over-expression of EZH2 has been reported to be correlated with cancer progression and poor prognosis, high grade and high stage in several tumor types. GSK126 is a potent inhibitor of EZH2 and its functional residence time on activated form of EZH2/PRC2 is mush longer than unactivated forms [1]. When tested with lymphoma cell lines, results showed that harboring EZH2 mutations such as Y641N, Y641F or A677G were more sensitivity [2]. In DMS53, Lu30, H209 SCLC cells, cellular growth was inhibited with 0.5, 2, and 8μM GSK126 treatment [3]. And GSK126 could also significantly restore ARNTL expression in ovarian cancer cells thus inhibit cell growth and enhance chemosensitivity of cisplatin [4].

Intermittent dosing of GSK126 treated subcutaneous KARPAS-422 xenografts model could effectively inhibit its growth with or without a 1 week drug holiday. In mouse model with EZH2 mutant DLBCL xenografts, treatment with GSK126 could markedly inhibit its growth [2].

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