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Meta-analysis of PD-L1 positive versus PD-L1 negative on tumor tissues (A) PD-1 positive versus PD-1 negative on tumor infiltrating lymphocytes (B) of epithelial-originated cancer patients in terms of overall survival. CI = confidence interval, HR = hazard ratio, PD-1 = programmed cell death 1, PD-L1 = PD-1 ligand 1.
