Fig. 3: Examples of markedly reduced (null-like) p53 IHC staining observed in HPV-associated carcinomas.

a Shows an invasive squamous cell carcinoma (SCC) involving the Bartholin gland (case 6) and “single cells” staining. b Shows a mucinous endocervical carcinoma (EDAC) with scattered “single cells” staining (case 46). c case 3, and d case 20, show scanty “clusters” of cells staining in invasive vulvar SCCs. e show “peripheral” staining in an EDAC (case 37).