PATIENT CHARACTERISTICS: Age: Not specified Performance status: Zubrod 0-1 Life expectancy: At least 6 months Hematopoietic: Absolute granulocyte count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL SGOT or SGPT no greater than 2 times upper limit of normal Renal: Creatinine no greater than 1.5 mg/dL Creatinine clearance at least 50 mL/min Calcium normal Cardiovascular: No symptomatic coronary artery disease No angina No myocardial infarction within the past 6 months Other: Not pregnant or nursing Fertile patients must use effective contraception No other malignancy within the past 3 years except nonmelanomatous skin cancer