Programmed death ligand-1 expression and its prognostic role in esophageal squamous cell carcinoma

Figure 1 Representative immunohistochemical images of programmed death ligand-1, c-Met, and p16 expression in esophageal squamous cell carcinoma tissues. A: PD-L1 expression was scored from 0 to 3+. Cases with scores of 0 were considered PD-L1-negative; B: c-Met intensity was scored from 0 to 3+. The H-score was calculated for each case. Cases with H-scores ≥ 50 were considered positive for c-Met expression; C: p16 expression was scored as negative or positive (Original magnification, × 400). PD-L1: Programmed death ligand-1.