PATIENT CHARACTERISTICS: Age: 18 and over (under 75 preferred) Performance status: ECOG 0-3 (ECOG 0 or 1 preferred) Hematopoietic: (preferred) WBC at least 3,000/mm3 Platelet count at least 100,000/mm3 Hematocrit at least 30% (transfusion allowed) Hepatic: (preferred) Bilirubin less than 2.0 mg/dL PT/PTT normal Renal: (preferred) Creatinine less than 2.0 mg/dL Cardiovascular: (preferred) At least 6 months since prior myocardial infarction No congestive heart failure, cardiac arrhythmia, or hypertension requiring medication Pulmonary: (preferred) pO2 at least 60 mm Hg Reasonable respiratory reserve No supplemental oxygen requirement Not dyspneic at rest Other: No chronic auto-coagulation (preferred) No active infection No chronic underlying immunodeficiency disease (including HIV, hepatitis B) No known autoimmune disease Not pregnant