did not reach statistical significancep = 0.1837
IDH1 105GGT and histological subtypes In grade II and III tumors, IDH1 105GGT was more frequent in astrocytomas (13 of 63 cases −20.6%) than in oligodendrogliomas (4 of 40 cases −10%), but the difference did not reach statistical significance (p = 0.1837, Fisher’s exact test).