FIGURE 2.

Signal regulatory protein α (SIRPα) expression was an indicator of poor prognosis for esophageal squamous cell carcinoma (ESCC) in our patient cohort. A, B, Representative immunohistochemical staining of SIRPα in surgically resected specimens from patients with ESCC. ESCC showing low (A) and high (B) SIRPα immunoactivity. Scale bar = 100 μm. C, D, Overall survival (C) and disease‐free survival (D) of high‐ (red line; n = 84) and low‐ (blue line; n = 47) expression of SIRPα were analyzed by the Kaplan‐Meier method. Statistical analysis was undertaken using the log‐rank test