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Forest plot analysis of pneumonia comparing PD-1/PD-L1/CTLA4 with control therapies. (A) PD-L1 inhibitor V.S. chemotherapy/placebo; (B) PD-1 inhibitor V.S. chemotherapy; (C) CTLA4 inhibitor V.S. chemotherapy/placebo; (D) PD-1 combined CTLA4 V.S. ICI. G1-5, grade 1-5; G3-5, grade 3-5, G5, death.
