IDH1 and glioblastoma: In addition, our results also indicated a higher prevalence of GBM IDH-wildtype, astrocytomas IDH-wildtype and IDH-mutant and 1p/19 codeleted gliomas in men (2:1; 1.3:1; 1.4:1 and 2.1 respectively), except for the GBM IDH-mutant subgroup (0.8:1) (Table 3).