Hierarchical clustering of tumors according to the expression of genes of the gliogenic progenitor vs. NIP. a. columns correspond to tumors and lines correspond to genes. NIPhigh subgroup contained 1p/19q co‐deleted AOT clustering together with higher expression of NIP genes. NIPlow subgroup contained the other 1p/19q co‐deleted AOT. b. WHO 2016 histological and integrated diagnoses and molecular markers are indicated for each tumor. Abbreviations: A3, IDH‐mutant: anaplastic astrocytoma, IDH‐mutant; GBM, IDH‐mutant: glioblastoma, IDH‐mutant; GBM, IDH‐wildtype, glioblastoma, IDH‐wildtype; IHC, immunohistochemical; OA3, anaplastic oligo‐astrocytoma; OD3, anaplastic oligodendroglioma.