 - Continuation therapy: After completion of all consolidation therapy, all patients receive vincristine IV on day 1; oral dexamethasone twice daily on days 1-5; oral mercaptopurine once daily on days 1-14; and MTX IV or IM on days 1, 8, and 15. Treatment repeats every 21 days for up to 24 months 102 weeks after achieving CR. Patients continue to receive TIT as in consolidation II until completion of therapy. 