PATIENT CHARACTERISTICS: Age: 18 and over Performance status: SWOG 0-2 Life expectancy: Not specified Hematopoietic: Platelet count at least lower limit of normal WBC at least 3,500/mm3 OR Absolute neutrophil count at least 1,750/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL AST no greater than 3 times upper limit of normal (ULN) (no greater than 5 times ULN with liver tumor involvement) Renal: Creatinine less than ULN OR Creatinine clearance greater than 60 mL/min Calcium less than ULN Cardiovascular: No myocardial infarction within past 6 months No congestive heart failure requiring therapy Other: Not pregnant or nursing Fertile patients must use effective contraception No physical, mental, or emotional disorders No other prior malignancy within the past 5 years, except: Adequately treated basal or squamous cell skin cancer Carcinoma in situ of the cervix Adequately treated stage I or II cancer in complete remission No active or uncontrolled infection HIV negative No known Gilbert's syndrome No uncontrolled diabetes (random blood sugar at least 200 mg)