Before collection of the PBPC, you will be treated with a drug called granulocyte colony stimulating factor (G-CSF), which will cause the important stem cells in the marrow to move the peripheral blood where they will be collected. This medication is given as a shot under the skin once a day for 3-7 days, at which time your PBPC will be collected from your central catheter during a 3-4 hour outpatient procedure. This procedure is standard, and is called leukapheresis. You will be required to sign a separate consent form for this procedure.