 Blood stem cells will be collected from patients when white blood cell counts are normal. This will be after earlier chemotherapy or after a bone marrow growth factor G-CSF has been given. Collecting stem cells takes about 3 hours. It takes from 1 to 6 sessions to get the needed amount of cells. The process is called apheresis. A machine is attached to the catheter, and blood is drawn. The machine removes the stem cells from the blood and the blood is then returned to the body through the catheter. G-CSF is injected under the skin twice a day during the time the stem cells are collected. The stem cells are stored frozen and will be used later to help patients recover from the high-dose chemotherapy. 