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Kaplan-Meier curves of progression-free survival in (A) all patients; (B)patients with negative PD-L1 expression; (C) patients with positive PD-L1 expression; (D) patients with low PD-L1 expression and (E) patients with high PD-L1 expression.HR, hazard ratios; mPFS, median progression-free survival; PD-L1, programmed death-ligand 1.
