Patients with a response over 50% proceed to 4-8 weeks of consolidation therapy. This regimen consists of vincristine IV on day 15, cyclophosphamide IV over 1 hour followed by methotrexate over 3 hours on day 1, cytarabine IV on days 2-5 and 8-11, asparaginase IV or IM on days 16 and 23, and methotrexate IV over 3 hours on day 15. Patients also receive methotrexate and methylprednisolone IT on days 2 and 16. Patients who achieve complete remission after 4 weeks repeat consolidation therapy for another course.