CD274 and esophageal squamous cell carcinoma: The results of HE staining showed that the degree of TIL in ESCC was different, and patients with evaluation analysis ≤10% accounted for 44.1% of the total patients, 32.4% of patients with PD-L1 expression >10% while <50%, and PD-L1 expression ≥50% accounted for 23.5% of patients.