CTLA4 and esophageal squamous cell carcinoma: The expression levels of T-CTLA-4 (p = 0.650) (Figure 4(a)), I-CTLA-4 (p = 0.352) (Figure 4(b)), and PLR (p = 0.083) (Figure 4(c)) still had no effect on the OS in patients with ESCC without the concurrent inflammatory diseases.