PATIENT CHARACTERISTICS: Age: 17 to 65 Performance status: Karnofsky 70%-100% Life expectancy: Not severely limited by illness other than leukemia Hematopoietic: Absolute neutrophil count greater than 2,000/mm3 (no growth factor support) Platelet count greater than 120,000/mm3 (unless documented active autoimmune thrombocytopenia) Hemoglobin greater than 10 g/dL (unless documented active autoimmune anemia) No coexisting myelodysplasia Hepatic: Bilirubin no greater than 2.0 mg/dL Renal: Creatinine clearance at least 50 mL/min Cardiovascular: No cardiac disease that would limit ability to receive cytoreductive therapy and compromise survival Pulmonary: No pulmonary disease that would limit ability to receive cytoreductive therapy and compromise survival Other: No HIV antibody Not pregnant