The outcomes assessed in these studies include the role of PD-L1 in the prognosis and clinicopathological features of OSCC, expressed as OS, DFS, DSS, lymph node metastasis, distal metastasis, HPV infection status, IHC findings, TNM stage, tumour recurrence, cutoff value, and sex. Here, CD274 is linked to metastatic malignant neoplasm in the lymph nodes.