CD8A and head and neck squamous cell carcinoma: The findings confirmed that high levels of CD8+ TILs have a favourable outcome for all prognostic parameters in the HPV− HNSCC cohort, i.e., for OS (HR 0.67; 95% CI: 0.58–0.79), DFS (HR 0.50; 95% CI: 0.37–0.68) and LRC (HR 0.82; 95% CI: 0.70–0.96) [64,70,71,72].