PATIENT CHARACTERISTICS: Age: 16 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: Unless documented bone marrow involvement: WBC at least 4,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2.0 mg/dL Renal: Creatinine no greater than 2.0 mg/dL Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception HIV negative No other prior malignancies within the past 5 years except curatively treated basal cell or squamous cell carcinoma of the skin or carcinoma in situ of the cervix No concurrent active infection requiring antibiotics