Prognostic factors of patients with glioblastoma are clinical [age at diagnosis, general state of health and the Karnofsky Performance Status (KPS)], histomolecular [IDH mutation, O6-methylguanine-DNA-methyltransferase (MGMT) promoter methylation status] and therapeutical [extent of surgical resection] (3). Here, IDH1 is linked to glioblastoma.