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Disease‐free and overall survival curves for patients with esophageal squamous cell carcinoma (subdivided according to hypoxia‐inducible factor‐1α protein status [HIF‐1α]). (a) Disease‐free survival curve: patients with low (n = 75) or high (n = 95) expression of HIF‐1α protein, and (b) overall survival curve: patients with low (n = 75) or high (n = 95) expression of HIF‐1α protein.
