Notably, MG-associated thymomas seem to represent a molecularly distinct subtype of TEN, given that hypermethylation of certain genes such as MLH1, MGMT, CDKN2A, and RASSF1A might be more frequent in TC than in thymomas [43,45,47,48], yet hypermethylation of these genes is neither frequent in thymomatous MG tissues nor does it correlate with the histopathologic features of the tumor [42]. This evidence concerns the gene MLH1 and myasthenia gravis.