 Therefore, before treatment begins, we will collect some of your own blood cells, called peripheral blood progenitor cells PBPCs. These cells help create new blood cells. The PBPCs are frozen and saved while you are being treated. Then at the end of treatment, your PBPCs are thawed and given back to you. These healthy PBPCs will replace the blood cells that the high dose chemotherapy destroys and allow your bone marrow to recover and produce blood cells. In a prior study we treated 69 patients in a similar way. More than half were able to avoid or delay brain radiation. This new study will use a different high dose chemotherapy regimen. 