Clin cancer research:EPZ-6438联合R-CHOP治疗弥漫性大B细胞淋巴瘤

2020-07-03 QQY MedSci原创

口服EZH2抑制剂tazemetostat(EPZ-6438)可以靶向依赖EZH2活性的异常增殖,EPZ-6438联合R-CHOP是否可安全用于弥漫性大B细胞淋巴瘤?

背景:组蛋白甲基转移酶EZH2是参与转录调控的PRC2复合物的催化亚基,约25%的生发中心B细胞淋巴瘤患者携带该基因突变。口服EZH2抑制剂tazemetostat(EPZ-6438)可以靶向依赖EZH2活性的异常增殖。

方法:这是一项Ib期的临床试验,评估EPZ-6438联合R-CHOP用于60-80岁的新确诊的弥漫性大B细胞淋巴瘤的安全性,并明确EPZ-6438的II期试验推荐剂量(RP2D)。

结果:共招募了17位患者。在C1和C2期间,共观察到2例剂量限制性毒性:1例3级便秘(400 mg)和1例5级肺部感染(800 mg)。≥10%的患者发生的≥3级毒性作用有便秘(24%)、恶心(12%)和低钾血症(12%)。8位(47%)患者发生3-4级血液学副作用:中性粒细胞减少(47%)、白细胞减少症(29%)、贫血(18%)和血小板减少症(12%)。EPZ-6438的RP2D为800 mg。EPZ-6438剂量增加未增加对器官的毒性。800 mg剂量时,EPZ-6438的AUC和Cmax与单药研究(E7438-G000-101)的相似。

结论:EPZ-6438与R-CHOP联合的RP2D是800 mg 2/日。安全性和PK的相关性与单用R-CHOP的相当。初始疗效数据令人鼓舞,值得进行II期试验进一步验证。

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