Forest plot of sPD-L1 in hepatocellular carcinoma. a Forest plot of sPD-L1 and OS in hepatocellular carcinoma. b Forest plot of sPD-L1 and DFS/RFS/TTP/TFS in hepatocellular carcinoma. CI, Confidence interval; HR, Hazard ratio; OS, Overall survival; sPD-L1, Soluble programmed cell death ligand-1; DFS, Disease-free survival; RFS, Recurrence-free survival; TTP, Time to progression; TFS, Tumor-free survival