AR and Warthin tumor: In another study that examined the clonality of the epithelial component of Warthin’s tumors using a PCR assay based on random inactivation of the gene by trinucleotide repeat polymorphisms and methylation of the X chromosome-related human androgen receptor gene (HUMARA), all cases showed a polyclonal X inactivation pattern, suggesting that Warthin’s tumors are non-neoplastic [105].