 - Consolidation II SR patients: Patients receive vincristine IV on day 1; oral dexamethasone twice daily on days 1-5; and oral mercaptopurine once daily on days 1-14. Treatment repeats every 21 days until IV-PEG OR IM-EC is completed. Patients also receive MTX IV or IM 1 day after each IV-PEG OR IM-EC dose and TIT every 9 weeks for 6 doses and then every 18 weeks thereafter. 