CDKN2A and oral lichen planus: Regarding clinical diagnosis, the highest level of expression was shown in samples of OLP (60.0% of clinically diagnosed samples resulting positive for p16INK4A related to HPV expression) and OL (53.9% of oral leukoplakia diagnosed samples), then mucosa overgrowth (21.5% of individuals with the clinical diagnosis) and mucocele (16% accordingly).