HIC1 and oligodendroglial tumor: Importantly, this study was the first to identify 14 methylated genes in oligodendroglial tumor patients, namely APC, MLH1, ATM, RARB, HIC1, BRCA1, CASP8, BRCA2, CD44, VHL, FHIT, IGSF4, CDH13, and MLH1.