According to the WHO 2016 classification [19], diffuse astrocytoma IDH-mutant was diagnosed in 29 patients (49%), oligodendroglioma IDH-mutant and 1p19q-codeleted in 23 patients (39%), and diffuse astrocytoma IDH-wildtype in 3 patients (5%). The gene discussed is IDH1; the disease is oligodendroglioma.