Kaplan-Meier analysis did not find the effects of the T-CTLA-4 expression level (p = 0.453), I-CTLA-4 expression level (p = 0.654), and PLR level (p = 0.703) on the OS in ESCC patients (Figure 3). The gene discussed is CTLA4; the disease is esophageal squamous cell carcinoma.