His work also reduced the likelihood of developing a life-threatening complication called graft-versus-host disease.
Furthermore, there is virtually no incidence of graft-versus-host disease.
Although there was some graft-versus-host disease, it was less destructive than expected.
Umbilical cord blood transplants also cause fewer problems with graft-versus-host disease.
Even more dangerous would be an attack on the patient by the transplant, a potentially fatal reaction known as graft-versus-host disease.
Two patients in the study died of complications from graft-versus-host disease.
T-cells are the ones that recognize the host as foreign, leading to graft-versus-host disease.
But then they looked at Henry, whose parents feared he was showing early signs of graft-versus-host disease - something Molly would almost certainly never get.
And it makes rejection and graft-versus-host disease less likely.
Butcher died on August 5, 2006 after fighting graft-versus-host disease and learning that the cancer had returned.