- Delayed intensification (7 weeks): Patients receive vincristine IV and doxorubicin IV over 15 minutes to 2 hours on days 0, 7, 14, and 21; asparaginase IM on day 3 and then 3 times a week for 6 doses; and oral dexamethasone on days 0-28. Patients also receive cyclophosphamide IV over 1 hour on day 35; cytarabine IV or SC on days 35-38 and 42-45; oral thioguanine on days 35-48; and methotrexate IT on days 35 and 42.