CD274 and metastatic malignant neoplasm in the lymph nodes: Univariate analysis showed that OS has significant correlation with TNM stage (P = 0.001), tumor size (P = 0.014), lymph node metastasis (P = 0.000), Treg count (P = 0.009), and PD-L1 expression (P = 0.007), while DFS was directly influenced by histology (P = 0.007), TNM stage (P = 0.001), tumor size (P = 0.010), lymph node metastasis (P = 0.002), Treg count (P = 0.038), and PD-L1 expression (P = 0.002).