The tumors identified in the study were classified as GBM, IDH wildtype (n = 15); astrocytic glioma, IDH-mutant, WHO grade 4 (astrocytic glioma G4) (n = 2); astrocytic glioma, IDH-mutant, WHO grade 3 (astrocytic glioma G3) (n = 4); astrocytic glioma, IDH-mutant, WHO grade 2 (astrocytic glioma G2) (n = 7); and NEC (n = 4). Here, IDH1 is linked to glioblastoma.