Kaplan-Meier survival curves for MCM4, MCM7, and Ki-67 in the esophageal adenocarcinoma group (A, B, and C, respectively) and squamous cell carcinoma group (D, E, and F, respectively). The overall survival time for patients with high percentage of MCM4 expression (>70%) was statistically shorter than patients with low percentage (≤70%) in the esophageal adenocarcinoma group (P = .03; A), but not in the squamous cell carcinoma group (D). No statistical significance was found in MCM7 and Ki-67 expression in both esophageal adenocarcinoma (B and C) and squamous cell carcinoma (E and F).