The Research Database contains demographic and clinical data on allogeneic related and unrelated donor and autologous HC transplants. Data are also collected on unrelated donors and their donation experiences. The data contained in the research databases are observational data. The Center for International Blood and Marrow Transplant Research (CIBMTR) does not determine which therapies are used for patients, but rather collects information regarding therapies as they are applied by transplant centers.