CD274 and metastatic malignant neoplasm in the lymph nodes: In terms of PFS, our results showed that lymph node metastasis was associated with poor progression-free survival and was statistically significant (HR: 4.10 [1.51, 11.15], p = 0.005620), while high PD-L1 expression (≥ 50%) was associated with good progression-free survival (HR: 0.36 [0.15, 0.85], p = 0.020216).