- Remission consolidation therapy: Patients receive cyclophosphamide IV on days 1 and 29; cytarabine IV or subcutaneously (SC) on days 1-4, 8-11, 29-32, and 36-39; oral mercaptopurine on days 1-14 and 29-42; vincristine IV on days 15, 22, 43, and 50; pegaspargase IM or IV on days 15 and 43; and IT methotrexate on days 1, 8, 15*, and 22*. Once blood counts recover, patients proceed to interim maintenance therapy.