PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 60%-100% Hematopoietic: (obtained within 3 weeks of entry) WBC at least 3,500 Platelets at least 100,000 Hepatic: Not specified Renal: (obtained within 2 weeks of entry) Creatinine clearance at least 50 mL/min (measured or calculated) Serum calcium normal Cardiovascular: Status adequate to tolerate all protocol therapy Pulmonary: Status adequate to tolerate all protocol therapy Other: Nutritional status adequate to tolerate all protocol therapy Mental status adequate to follow instructions and keep appointments No second malignancy except nonmelanomatous skin cancer (Patients who have been disease-free for at least 3 years following treatment for a prior cancer may be eligible at the discretion of the protocol chairman) Negative pregnancy test required of fertile women Effective contraception required of fertile women