CDKN2A and neoplasm: Moreover, no statistically significant correlation was found between P16INK4a expression and morphological prognostic factors such as the tumor cell cytotype (epithelioid, spindle, or mixed), being the ANOVA statistical test performed between groups not significant (p > 0.05); no correlation was found between P16INK4a expression and the largest basal diameter (LBD) (p > 0.05) (Figures 4A,C).