PATIENT CHARACTERISTICS: Age: 16 and over Performance status: CALGB 0-2 Karnofsky 70-100% Life expectancy: More than 2 months Hematopoietic: Neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 3 times normal SGOT and SGPT less than 3 times normal Alkaline phosphatase less than 3 times normal Hepatitis B surface antigen negative Renal: Creatinine normal Creatinine clearance at least 60 mL/min Cardiovascular: Cardiac ejection fraction normal by MUGA scan No uncontrolled or severe cardiovascular disease, including the following: Myocardial infarction within the past 6 months Congestive heart failure Symptomatic angina (despite optimal medical management) Life-threatening arrhythmia or hypertension Pulmonary: Pulmonary function tests (DLCO and spirometry) greater than 60% predicted Other: HIV negative No serious organ dysfunction (unless caused by lymphoma) No active bacterial, viral, or fungal infection No active peptic ulcer disease No uncontrolled diabetes mellitus No other malignancy except curatively treated carcinoma in situ of the cervix or basal cell or squamous cell skin cancer No other serious medical or psychiatric illness that would preclude study Not pregnant