PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: See Disease Characteristics Absolute neutrophil count at least 1000/mm3 Platelet count at least 50,000/mm3 Hemoglobin at least 8 g/dL Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) ALT or AST no greater than 2 times ULN Albumin greater than 3.0 g/dL No hepatitis B or C infection Renal: Creatinine no greater than ULN Other: Not pregnant or nursing Fertile patients must use effective contraception HIV negative No active infection requiring anti-infective therapy No other prior invasive malignancy within past 5 years, except: Curatively treated basal cell or squamous cell skin cancer Carcinoma in situ of the cervix