The dataset provides anonymized patient and donor data from hematopoietic stem cell transplants, enabling secondary analysis by researchers. It includes detailed information on diseases, such as leukemias, lymphomas, and other conditions, along with variables related to age, graft source, donor type, and transplant outcomes like overall survival and complications. The dataset also captures data on infusion types, conditioning regimens, and post-transplant events, such as infections and late effects. Its purpose is to support research into transplantation efficacy, safety, and long-term health impacts while safeguarding participant privacy.