PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 70-100% Life expectancy: Not specified Hematopoietic: WBC at least 3000/mm3 Lymphocyte count at least 700/mm3 Platelet count at least 100,000/mm3 Hepatic: Not specified Renal: Creatinine no greater than 2.0 mg/dL Cardiovascular: No clinically significant heart disease Other: No other serious illness No active infections requiring antibiotics within past 2 weeks Not pregnant or nursing Fertile patients must use effective birth control No known immunodeficiency No active bleeding