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1文献来源Paz-Ares L,Luft A,Vicente D,et al.Pembrolizumab plus chemotherapy for squamous non-small-cell lung cancer[J].N Engl J Med,2018,379(21):2040-2051.2证据水平1b。3背景转移性鳞状非小细胞肺癌(non-small cell lung cancer,NSCLC)的标准一线方案是铂类化疗或帕博利珠单抗,针对肿瘤细胞的程序性死亡配体1(programmed de