According to the National Marrow Donor Program (NMDP), cord blood stem cell transplant accounted for 20% of US transplants in 2008, which included both child and adult recipients. Two forms of stem cell transplants exist:
When cord blood is banked publicly, it may be used for unrelated allogeneic transplants; when banked privately, it may be used for autologous transplant or a related allogeneic transplant, usually to a close family member/sibling.
Limited research evidence exists on the probability of a person receiving an autologous umbilical cord blood transplant. The most recent work by Nietfeld et al. 2008 predicted the probability of a child, up to 20 years of age, receiving an autologous stem cell transplant to be 1 in 5,000 and increasing to 1 in 450 by age 70. However, this probability cannot be interpreted as that of receiving a cord blood transplant, as the paper addressed hematopoietic stem cell transplants (HSCT) which refers to blood-forming stem cells, such as those also found in bone marrow, not exclusively in cord blood. The most appropriate source of cells would need to be determined at the time of transplant.
Advantages of cord blood stem cell transplant are that it requires looser matching between the HLA tissue types of the donor and recipient. For a traditional bone marrow transplant, all 6 key antigens must match to prevent complications like graf-versus-host reaction (commonly called rejection). With a cord blood transplant, only 4 key antigens must match. The HLA tissue type is inherited from the child's parents making the likelihood a of sibling match on 6/6 antigens 25% and the likelihood of a 4/6 match 39%.
However, according to the NMDP, the cumulative total of all cord blood transplants from public banks in 2008 was 650 times the number from private banks, constituting unrelated allogeneic transplants. 40% of transplants occur from donors/recipients residing in different countries.
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