BAK1 and head and neck squamous cell carcinoma: HNSCC patients in the subtype of high BAK1 expression included lower infiltration levels of memory B cells (p < 0.001), follicular helper T cells (p < 0.001), Tregs (p < 0.001), and activated mast cells (p < 0.05) while having higher infiltration levels of resting NK cells (p < 0.05) and M2 macrophages (p < 0.05) (Figure 6C).