A bone marrow transplant (BMT) is a specialised medical procedure for people with certain cancers or other illnesses. Bone marrow transplantation is a procedure in which the donor’s stem cells are removed from the bone marrow, purified, and either given to another person or returned to the donor (patient). After treating the patient’s sick bone marrow to destroy the aberrant cells, BMT aims to transfuse healthy bone marrow cells into the recipient.