Fig. 2From: Human papillomavirus genotypes and P16INK4A expression in squamous penile carcinoma in Mexican patientsHuman papillomavirus DNA in penile carcinoma. a proportion of HPV negative cases, HPV single genotype, and HPV multiple genotypes. b The frequency of HPV genotypes and carcinogenic classification according to the IARC. * The possible presence of HPV is not ruled outBack to article page