IDH1 and astrocytoma (excluding glioblastoma): Histological diagnoses included 26 patients with glioblastoma, IDH-wildtype, 8 with IDH-mutant (3 astrocytoma, IDH-mutant, grade 2; 2 astrocytoma, IDH-mutant, grade 3; 3 astrocytoma, IDH-mutant, grade 4).