Beginning on day 56 of delayed intensification II chemotherapy, patients receive maintenance chemotherapy comprising oral DM twice daily on days 0-4, 28-32, and 56-60; VCR IV on days 0, 28, and 56; oral MP on days 0-83; oral MTX on days 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, and 77; and MTX IT on day 0.