Glioblastoma is the most frequent primary malignant brain tumor in adults. Methylation of the O-6-methylguanine-DNA methyltransferase (MGMT) promotor is of prognostic as well as of predictive value, as patients with MGMT promotor methylation survive longer and have better responses to the alkylating chemotherapeutic agent temozolomid. The current first line therapy approaches after maximum safe resection include radio-chemotherapy with temozolomid, radio-chemotherapy with the combination of temozolomid and CCNU as well as tumor treating fields. Currently several early clinical studies investigate new treatment possibilists in glioblastoma. Listen to the podcast with Professor Ulrich Herrlinger, Division of Clinical Neurooncology, Department of Neurology and Center of Integrated Oncology, University Hospital Bonn, Germany.