TET1 and oligodendroglioma: Variants in tumor associated genes not typically associated with oligodendroglioma were also found, such as missense variants in TET1 (NM_030625:c.4399G>A; p.Glu1467Lys) and TGFBR2 (NM_003242:c.426G>C; p.Glu142Asp as well as a frameshift variant in ARID1A (NM_006015:c.