- Conventional consolidation therapy: During course 1, patients receive ARA-C IV over 30 minutes and VP-16 IV over 1 hour on days 1-5; VCR IV on days 1, 8, 15, and 22; and oral dexamethasone on days 1-28. During course 2 (which begins 4 weeks after initiation of course 1 or when blood counts recover), patients receive ARA-C and VP-16 as in course 1. During course 3 (which begins 4 weeks after initiation of course 2 or when blood counts recover), patients receive DNR IV on days 1, 8, 15, and 22; CTX IV over 30 minutes on day 29; ARA-C IV over 30 minutes on days 31-34 and 38-41; and oral thioguanine on days 29-42. During course 4 (which begins 8 weeks after initiation of course 3 or when blood counts recover), patients receive treatment as in course 2.