- Delayed intensification therapy I: All patients receive vincristine IV on days 1, 8, 15, 43, and 50; oral or IV dexamethasone twice daily on days 1 to 21 for patients age 1 to 12 OR on days 1-7 and 15-21 for patients age 13 and over; doxorubicin IV on days 1, 8, and 15; pegaspargase IM on day 4, 5, or 6 AND day 43; cyclophosphamide IV over 30 minutes on day 29; cytarabine IV or SC on days 30-33 and 37-40; oral thioguanine on days 29-42; and IT MTX on days 1, 29, and 36.