PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 8 weeks Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2.0 mg/dL SGOT no greater than 4 times normal Renal: Creatinine no greater than 2 mg/dL Calcium no greater than 10.5 mg/dL Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception (double-barrier method and oral contraception) prior to, during, and for at least 2 weeks after study