The invention relates to 6-{4-[1-(Propan-2-yl)piperidin-4-yl]-1,4-diazepan-1-yl}-N-(pyridin-4-yl)pyridine-2-carboxamide, or a pharmaceutically acceptable salt thereof, for use in treatment of CNS cancers. The invention also relates to combination treatments with irradiation and/or a chemotherapeutic agent for use in the treatment of cancer