We collected five DMG, three IDH-wildtype primary GBM (GBMIDHwt), two IDH-mutant secondary GBM (GBMIDHmut), and one peritumor samples from ten patients requiring surgical resection (Fig. 1a, Supplementary Figs. 1a and 2a, and Supplementary Data 1). Here, IDH1 is linked to glioblastoma.