Fig. 2From: Efficacy and safety of anti-PD-1 inhibitor versus anti-PD-L1 inhibitor in first-line treatment of extensive-stage small cell lung cancer: a multicenter retrospective studyKaplan-Meier curve of PFS and OS. A: PFS between PD-1 group and PD-L1 group; B: OS between PD-1 group and PD-L1 groupBack to article page