Fig. 6From: The efficacy and safety of combination of PD-1 and CTLA-4 inhibitors: a meta-analysisForest plot of hazard ratio (HR). Comparison of progression-free survival (PFS) between α-CTLA-4 plus α-PD-1 combination treatment and other treatments in the high PD-L1 expression status (a) and low PD-L1 expression status (b). CI: confidence intervalBack to article page