 7. Patients must be 4 weeks beyond major surgical procedures such as thoracotomy, laparotomy or joint replacement, and must be 1.5 weeks beyond minor surgical procedures such as biopsy of subcutaneous tumors, pleuroscopy, etc, and must not have evidence of wound dehiscence, active wound infection, or comparable major residual complications of the surgery. Absolute neutrophil count ANC 1500 109mm3, platelet count 100,000 109mm3. Prothrombin time PT and Partial thromboplastin time PTT 1.25 times the institutional upper limit of normal. 