The National Marrow Donor Program (NMDP) is a nonprofit organization that connects patients with blood cancers, like leukemia, to potential stem cell donors. It operates the Be The Match registry, which helps find compatible donors for patients in need of a bone marrow or peripheral blood stem cell transplant. Founded in 1986, the NMDP works to increase the number of registered donors and raise awareness about the importance of donating. The program also provides support and resources for patients and their families throughout the transplant process, ensuring they receive the best possible care.