Patients receive induction chemotherapy comprising vincristine IV on days 1, 8, and 15; oral prednisone three times a day on days 1-21; daunorubicin IV over 30 minutes on days 1-2; cyclophosphamide IV over 30 minutes every 12 hours on days 3-4; and asparaginase intramuscularly (IM) on days 4, 6, 8, 10, 12, 15, 17, and 19. Patients also receive triple intrathecal therapy comprising methotrexate, hydrocortisone, and cytarabine on days 1, 8, and 15 and filgrastim (G-CSF) subcutaneously (SC) or IV beginning on day 5 and continuing until day 20, regardless of blood counts.