A = cdk4 expression in OLP; dense nuclear and cytoplasmic staining in all layers of the epithelium. The intensity of the staining varies from weak (black arrow) to moderate to intense. Most cells with intense staining are confined to the basal and suprabasal layers (red arrows) (immunostaining, original magnification x400).
B = p16 expression in OLP; intense positive cells in the epithelium, again in basal and suprabasal layers (arrows) (immunostaining, original magnification x400).