CD274 and metastatic malignant neoplasm in the lymph nodes: The low-density group of PD-L1+/CD8 constituted 73.1% (19/26) over the total cases with lymph node metastasis, whereas the high-density group of PD-L1−/CD8 took up 3.8% (1/26) over all cases with lymph node metastasis.