OUTLINE: Upon completion of Induction/Intensification and Re-Induction therapy, patients with the 11q23 abnormality and with a matched or one-antigen mismatched related or unrelated donor proceed immediately to Transplantation; all others proceed to Re-Intensification, Consolidation, Intensified Maintenance, and Routine Maintenance. The following acronyms are used: AlBM Allogeneic Bone Marrow ARA-C Cytarabine, NSC-63878 ASP Asparaginase, NSC-109229 CF Leucovorin calcium, NSC-3590 CTX Cyclophosphamide, NSC-26271 CYSP Cyclosporine, NSC-290193 DM Dexamethasone, NSC-34521 DNR Daunorubicin, NSC-82151 G-CSF Granulocyte-Colony Stimulating Factor (Amgen), NSC-614629 HC Hydrocortisone, NSC-10483 MePRDL Methylprednisolone, NSC-19987 Mesna Mercaptoethane sulfonate, NSC-113891 MP Mercaptopurine, NSC-755 MTX Methotrexate, NSC-740 PEG-ASP Pegaspargase, NSC-644954 PRED Prednisone, NSC-10023 TBI Total-Body Irradiation TIT Triple Intrathecal Therapy (IT ARA-C/IT HC/IT MTX) VCR Vincristine, NSC-67574 VH Very High Dose VP-16 Etoposide, NSC-141540 INDUCTION/INTENSIFICATION: 5-Drug Combination Systemic Chemotherapy followed by 3-Drug Combination Systemic Chemotherapy plus 3-Drug Combination Intrathecal Chemotherapy. DM/VCR/DNR/CTX/Mesna/ASP; followed by MTX/CF/VP-16/CTX/Mesna; plus TIT. RE-INDUCTION: 5-Drug Combination Systemic Chemotherapy plus 3-Drug Combination Intrathecal Chemotherapy. DNR/VCR/CTX/Mesna/ASP/DM; plus TIT. RE-INTENSIFICATION: 2-Drug Combination Systemic Chemotherapy plus Single-Agent Intrathecal Chemotherapy followed by 2-Drug Combination Systemic Chemotherapy. VCR/VH MTX/CF; plus IT ARA-C; followed by VP-16/CTX/Mesna. CONSOLIDATION: 2-Drug Combination Systemic Chemotherapy followed by 2-Drug Combination Systemic Chemotherapy plus Single-Agent Intrathecal Chemotherapy. ARA-C/ASP; followed by VH MTX/CF/VCR; plus IT ARA-C. INTENSIFIED MAINTENANCE: 4-Drug Combination Systemic Chemotherapy plus Single-Agent Intrathecal Chemotherapy followed by 2-Drug Combination Systemic Chemotherapy. DM/VCR/MTX/MP; plus IT ARA-C followed by VP-16/CTX/Mesna. ROUTINE MAINTENANCE: 4-Drug Combination Systemic Chemotherapy plus Single-Agent Intrathecal Chemotherapy. VCR/MTX/MP/PRED; plus IT MTX. TRANSPLANTATION: 2-Drug Combination Myeloablative Chemotherapy followed by Radiotherapy followed by Hematopoietic Rescue plus GVHD Prophylaxis. ARA-C/CTX; followed by TBI using a linear accelerator or Co60 equipment; followed by AlBM; plus MePRDL; CYSP.