智通财经APP讯，科伦博泰生物-B(06990)发布公告，靶向人类表皮生长因子受体2(HER2)的抗体药物偶联物(ADC)博度曲妥珠单抗(前称A166)的新药申请(NDA)(该申请)已获中国国家药品监督管理局(NMPA)药品审评中心(CDE)受理，用于既往至少接受过一种抗HER2治疗的HER2阳性不可切除或转移性乳腺癌成人患者的治疗。
该申请是基于一项多中心、随机、开放、对照、III期KL166-III-06临床研究，评估博度曲妥珠单抗单药对比恩美曲妥珠单抗(T-DM1)在既往接受过曲妥珠单抗和紫杉类治疗的HER2阳性不可切除或转移性乳腺癌患者中的疗效和安全性结果。在预设的期中分析中，与T-DM1相比，博度曲妥珠单抗单药在主要研究终点盲态独立中心评估(BICR)评估的无进展生存期(PFS)具有显著统计学意义和临床意义的改善。
博度曲妥珠单抗是本公司研发的创新HER2 ADC，其通过稳定酶可裂解连接子将新型MMAF衍生物(高细胞毒性微管蛋白抑制剂Duo-5)与HER2单克隆抗体偶联，药物抗体比(DAR)为2。博度曲妥珠单抗特异性结合肿瘤细胞表面的HER2，并被肿瘤细胞内吞，在胞内释放毒素分子Duo-5，Duo-5诱导肿瘤细胞周期阻滞在G2/M期，引起肿瘤细胞凋亡。博度曲妥珠单抗靶向结合HER2后也可抑制HER2介导的信号通路;其具有抗体依赖细胞介导细胞毒作用(ADCC)活性。
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