CD8A and head and neck squamous cell carcinoma: We found that the infiltration levels of B cells, CD8+ T cells, mast cells, NK cells, iDCs, pDCs, helper T cells, follicular helper T cells, Tfh, Th1 cells, Th2 cells, TILs, M0 macrophage cells, eosinophils and activated mast cells were significantly different between low and high-risk groups in both TCGA-HNSCC (Figures 9A,C) and GEO-HNSCC cohorts (Figures 9B,D).