CD274 and esophageal squamous cell carcinoma: In patients with stage III-IV ESCC, the tumoral PD-L1 expression (≥1%, 5%, 10%, 20%, 30% or 50% as cut-off value) was not associated with DFS (P=0.247, 0.599, 0.220, 0.313, 0.151, or 0.202) and OS (P=0.292, 0.747, 0.272, 0.266, 0.081 or 0.108) (Figure 2).