Although the potential use of umbilical cord blood is expanding rapidly, the odds that family member without a defined risk will need to use their child's umbilical cord blood are low. There is no guarantee that the umbilical cord blood will be a match for a family member or will provide a cure. Autologous cord blood stem cells will not guarantee suitable treatment for all inherited genetic diseases. As with any transplant therapy, therapeutic success depends upon many factors beyond the stem cells themselves including patient condition, type of disease, recipient-donor relationship and matching, and other factors.