PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0 or 1 Life expectancy: Greater than 3 months Hematopoietic: WBC at least 3500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 10.0 g/dL Hepatic: Bilirubin less than 2.0 mg/dL SGOT less than 3 times normal Renal: Creatinine less than 2.0 mg/dL Other: Not pregnant Fertile patients must use effective contraception HIV negative No active infections requiring antibiotic, antiviral, or antifungal therapy No other active malignancy No concurrent significant illnesses