How big is the chance of any one person needing a bone marrow transplant?

Small: The diseases that require a transplant are uncommon and there is no database in the United States with information on every stem cell transplant performed. One study estimated the lifetime probability at 0.23% to iust under 1%.

15,000 a year: It is hard to answer because the number of diseases that require bone marrow transplant vary, and the types of cells used also very. It is estimated that about 15, 000 patients need a bone marrow or umbilical cord blood transplant in the us each year; according to the health resources and services administration. http://bloodcell.transplant.hrsa.gov/about/general_faqs/index.html.