How often does a bone marrow transplant not work, and the leukemia cells come back?

Please give more inf: Depends on many factors including the type of leukemia, age, type of transplant. A more specific question would be easier to give an adequate response. In general allogeneic transplants for AML in remission usually have a leukemia free relapse rate of greater than 50%.

Variable: The success and failure rate of a bone marrow transplant is dependent on factors such as the type of leukemia, prior therapies the patient has had, type of transplant, and the number of times the leukemia has relapsed in the past. Please ask the question again with more details.

Depends,....: The specific leukemia, remission status at transplant, chemo/radiation used to do the transplant etc all must be considered to provide more information on this issue.