PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 70-100% Life expectancy: Not specified Hematopoietic: Absolute granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 No evidence of bleeding diatheses Hepatic: SGPT no greater than 2 times upper limit of normal (ULN) Alkaline phosphatase no greater than 2 times ULN Bilirubin less than 1.5 mg/dL Renal: BUN less than 1.5 times ULN OR Creatinine less than 1.5 times ULN Cardiovascular: Not specified Pulmonary: Not specified Other: No active uncontrolled infection Must be afebrile (less than 38.0 degrees Celsius) No other unstable or serious medical conditions HIV negative Not pregnant or nursing Fertile patients must use effective contraception