CDKN2C and head and neck squamous cell carcinoma: Among the 32 cancers with TIMER data (Fig. 8F and Additional file 8), CDKN2C expression represented weak to strong correlations with infiltration levels of all six types of immune cells in the top three cancers (i.e., all absolute values of Spearman ρ > 0.2, p < 0.05)—THYM, COAD, and HNSCC (Fig. 8F).