The prognostic role of PD-L1 expression for survival in head and neck squamous cell carcinoma: A systematic review and meta-analysis

PD-L1 expression detected by IHC was not recommended to predict survival in HNSCC patients. However, the positive PD-L1 expression might predict better PFS in patients with advanced HNSCC. The combined effects of PD-L1 expression and CD8+ tumor-infiltrating T cells should be further elucidated.