Medical College of Wisconsin is also one of the leading centers worldwide for research into blood and marrow transplantation. The Medical College is home to the Center for International Blood and Marrow Transplant Research (CIBMTR). The CIBMTR formed in 2004 brings together two major organizations in the field of blood and marrow transplant research: the National Marrow Donor Program® and the Medical College of Wisconsin's International Bone Marrow Transplant Registry and Autologous Blood and Marrow Transplant Registry. The IBMTR has tracked the outcomes of transplants and conducted research into transplantation since 1972. The CIBMTR has also established the Stem Cell Therapeutic Outcomes Database (SCTOD) for the C.W. Bill Young Cell Transplantation Program (administered by the United States Health Resources and Services Administration (HRSA).
The CIBMTR also facilitates and coordinates the Blood and Marrow Transplant (BMT) Clinical Trials Network (CTN). The CTN, established in October 2001 conducts large multi-institutional clinical trials in the field of hematopoietic stem cell transplantation. These trials address cutting edge issues in hematopoietic stem cell transplantation (HSCT), increasing the understanding of treatment approaches as well as developing novel ideas in the field. Dr. Mary M. Horowitz, a practicing transplant physician within the MCW BMT program. is the Scientific Director of the CIBMTR and coordinates the Bone Marrow Transplant Clinical Trials Network.