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Meta-analysis of the effect of PD-L1 expression on overall survival. The forest plot of hazard ratio for overall survival of patient with sarcoma (A), subgroup analysis stratified by the histological subtype (B), subgroup analysis stratified by the histological subtype (C). Subgroup analysis stratified by the cutoff (D). Subgroup analysis stratified by the target of PD-L1 assessment (E). PD-L1 = programmed cell death-ligands 1.
