MLH1 and thymoma: Coppedè et al. investigated MutL homolog 1 (MLH1), O(6)-methylguanine-DNA methyltransferase (MGMT), Cyclin Dependent Kinase Inhibitor (CDKN2A) and Ras association domain family 1 isoform A (RASSF1A) methylation levels in blood and tumor specimens from 69 patients with thymoma-associated MG and in the adjacent normal thymus available from 44 of them, and concluded that promoter methylation levels of these genes were neither increased in thymoma nor associated with the histopathological features of TEN [42].