IDH1 and glioma: Previous studies have found a strong association between rs55705857 and oligodendroglial tumors (particularly tumors with isocitrate dehydrogenase 1/2 (IDH1/2) mutation and loss of the short arm of chromosome 1 [1p] and the long arm of chromosome 19 [19q]), so this association was further explored in the non-GBM (lower grade glioma [LGG]) histology groups (Table 3).