PATIENT CHARACTERISTICS: Age: Over 18 Performance status: ECOG 0-2 Hematopoietic: WBC greater than 4,000/mm3 Absolute neutrophil count greater than 2,000/mm3 Platelet count greater than 100,000/mm3 Hepatic: Bilirubin less than 1.5 mg/dL AST less than 3 times normal Prothrombin time less than upper limit of normal Renal: Creatinine no greater than 1.5 mg/dL OR Creatinine clearance at least 60 mL/min Calcium normal Electrolytes normal Other: Diabetes controlled by diet or insulin allowed Not pregnant Fertile patients must use effective contraception during and for 2 months after study