20% of children with ALL still fails to be cured. The ALL-2008 protocol is a treatment and research protocol that aims to improve the overall outcome of Nordic children and adolescents with ALL in comparison with the ALL-2000 protocol and previous NOPHO protocols.~The specific and primary objectives of the randomised study is:~To replace intrathecal triple (methotrexate, cytarabine and glucocorticosteroid) by intrathecal liposomal cytarabine and glucocorticosteroid during maintenance therapy in order to decrease the central nervous system relapse rate in high-risk acute lymphoblastic leukemia patients.~To evaluate acute and long-term toxicity in both treatment arms.
Replacement of intrathecal Triple (methotrexate, cytarabine, prednisolone) with intrathecal liposomal cytarabine and prednisolone during maintenance therapy will decrease the CNS relapse rate in high-risk ALL patients.~Both acute and long-term toxicity are equal in both treatment arms.