PDCD1 and pneumonitis: PD-1/PD-L1 + Chemotherapy), the risk of pneumonitis was not significantly increased (OR = 1.11, 95%CI [0.78, 1.59], I2 = 0%, Z = 0.59 (P = 0.56); Fig. 2E) [19, 21, 24, 34, 82].