A groundbreaking study led by Dr Monika E. Hegi, MD, PhD and European Organisation for Research and Treatment of Cancer (EORTC) headquarters team (Felix Oppong Msc, Dr Thierry Gorlia, PhD) reveals that older adults glioblastoma patients with truly unmethylated MGMT promoter do not benefit from temozolomide (TMZ) treatment, challenging current treatment protocols and paving the way for more personalised therapies.