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1文献来源Herbst RS,Baas P,Kim DW,et al.Pembrolizumab versus Docetaxel for previouslytreated,PD-L1-positive,advanced non-small-cell lungcancer(KEYNOTE-010):A randomised controlledtrial[J].Lancet,2016,387(10027):1540-1550.2证据水平1b。