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1 文献来源rnRudin CM, Awad MM, Navarro A, et al.Pembrolizumab or placebo plus etoposide and platinum as first?line therapy for extensive?stage small?cell lung cancer:Randomized,double?blind,phaseⅢKEYNOTE?604 study[J]. J Clin Oncol,2020,38 (21):2369-2379.