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Prognosis according to PD‐L1 and ZEB1 expression in patients with esophageal squamous cell carcinoma. (a) Overall and (b) relapse free survival rates of patients with esophageal squamous cell carcinoma in relation to PD‐L1 expression status. (c) Overall and (d) relapse free survival rates of patients in relation to PD‐L1 and ZEB1 expression status.
