- Arm IV: Patients receive induction therapy as in arm III. Patients in all arms are evaluated at day 29 of induction therapy. Patients with M3 disease are removed from study. Patients with M1 disease and less than 1% minimal residual disease (MRD) proceed to consolidation therapy beginning on day 36. Patients with M2 disease OR with M1 disease and at least 1% MRD receive extended induction therapy for 2 additional weeks. Patients with SER disease and MLL rearrangements are removed from the study but may be eligible for treatment on protocol COG-AALL0031.