OUTLINE: Nonrandomized study. Patients achieving remission on Induction proceed to Interim Maintenance, then to Continued Maintenance; those failing to achieve remission receive Salvage Re-induction, followed, if remission is achieved, by Interim Maintenance, then Continued Maintenance. Induction: 4-Drug Combination Chemotherapy with CNS Prophylaxis/Therapy. Vincristine, VCR, NSC-67574; Prednisone, PRED, NSC-10023; Asparaginase, ASP, NSC-109229; Daunorubicin, DNR, NSC-82151; with Intrathecal Cytarabine, IT ARA-C, NSC-63878; Intrathecal Dexamethasone, IT DM, NSC-34521. Interim Maintenance: 3-Drug Combination Chemotherapy with, as indicated, Radiotherapy. VCR; ASP; Methotrexate, MTX, NSC-740; with, as indicated, testicular irradiation (equipment not specified). Continued Maintenance: 3-Drug Combination Chemotherapy followed by 3-Drug Combination Chemotherapy with CNS Prophylaxis and, as indicated, Radiotherapy. Capizzi II: ARA-C; ASP; DNR; followed by Capizzi I: VCR; ASP; MTX; with IT ARA-C; IT DM; and, as indicated, cranial irradiation (equipment not specified). Salvage Re-induction: 2-Drug Combination Chemotherapy. ARA-C; ASP.