Figure captions
Figure 1. Flow chart of the search strategy.
Figure 2. PD-1/PD-L1 inhibitors vs control treatment in overall response rate (ORR).
Figure 3. PD-1/PD-L1 inhibitors vs control treatment in overall survival (OS).
Figure 4. PD-1/PD-L1 inhibitors vs control treatment in progression-free survival (PFS).