智通财经APP获悉，美国FDA今日(3月20日)宣布，完全批准默沙东公司(MRK.US)开发的重磅PD-1抑制剂Keytruda(pembrolizumab)与曲妥珠单抗、含氟嘧啶和铂类化疗联用，一线治疗局部晚期不可切除或转移性HER2阳性胃癌或胃食管结合部腺癌成人患者。他们的肿瘤表达PD-L1(CPS≥1)。此前，Keytruda在2021年获得FDA加速批准治疗这一适应症。
据悉，Keytruda是默沙东开发的PD-1抑制剂，可阻断PD-1与其配体PD-L1和PD-L2之间的相互作用，释放PD-1信号通路介导的免疫反应抑制，从而激活可能影响肿瘤细胞和健康细胞的T淋巴细胞，进而增强人体免疫系统发现和消灭癌细胞的能力。
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