PATIENT CHARACTERISTICS: Age: 16 and over Performance status: Karnofsky 70-100% Life expectancy: At least 6 weeks Hematopoietic: WBC at least 3,500/mm3 Platelet count at least 100,000/mm3 Prothrombin time less than 1.3 times control Hepatic: Serum bilirubin no greater than 1 mg/dL Renal: Serum creatinine no greater than 2 mg/dL Cardiovascular: No New York Heart Association Class III/IV Other: No serious infection or illness Not pregnant or lactating Effective contraception required of fertile patients No hypercalcemia greater than 12.5 mg/dL or symptomatic