PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 60-100% Life expectancy: Not specified Hematopoietic: Neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL SGOT no greater than 3 times upper limit of normal Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: No uncontrolled hypertension No unstable angina No symptomatic congestive heart failure No myocardial infarction within 6 months No serious uncontrolled cardiac arrhythmia Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No severe nonmalignant systemic disease or active infection No concurrent alcoholism or drug abuse No psychosis HIV negative