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Forest plot and pooled HR and 95% CI for subgroup OS: “ICI combination therapy” versus “ICI monotherapy”. (a: OS of 1st line; b: OS of “≧2nd line”; c: OS of anti-PD-1 therapy in control group; d: OS of anti-PD-L1 therapy in control group; e: OS of anti-CTLA4 therapy in control group; f: OS of melanoma; g: OS of lung cancer; h: OS of head and neck squamous cell carcinoma) HR, hazard ratios; CI, confidence intervals; OS, progression free survival; ICI, immune checkpoint inhibitor.
