- Induction therapy (weeks 1-5): Patients receive oral prednisone 3 times daily on days 1-29; vincristine IV on days 1, 8, 15, and 22; daunorubicin IV on days 8, 15, 22; and asparaginase intramuscularly (IM) on days 2, 5, 8, 12, 15, and 19. Patients also receive methotrexate intrathecally (IT) on days 1 and 8. Patients with CNS 2 or 3 disease also receive methotrexate IT on days 15 and 22.