PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 80-100% Hematopoietic: White blood cell (WBC) count of at least 4,000/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 11 g/dL Hepatic: Not specified Renal: Not specified Other: No major medical or psychiatric illness that would preclude study No other malignancy within the past 5 years