- Delayed intensification (7 weeks): Patients receive vincristine IV and doxorubicin IV over 15 minutes to 2 hours on days 0, 7, and 14; asparaginase IM on day 3 and then 3 times a week for 6 doses; oral dexamethasone on days 0-30; cyclophosphamide IV over 1 hour on day 28; and cytarabine IV or SC on days 28-31 and 35-38. Patients also receive oral thioguanine on days 28-41 and methotrexate IT on days 28 and 35.