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Funnel plot of the meta-analysis: (A) OS in PD-L1 expression; (B) RFS in PD-L1 expression; (C) TTR in PD-L1 expression; (D) OS in PD1 expression; (E) RFS in PD1 expression. PD-L1, programmed cell death ligand 1; OS, overall survival; RFS, recurrence-free survival; TTR, time to relapse.
