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).