types of bone marrow transplants
1. Autologous Bone Marrow Transplant
In an autologous transplant, the patient’s own stem cells are used.
How it works: Healthy stem cells are collected from the patient's blood or bone marrow before they undergo high-dose chemotherapy or radiation therapy. The collected cells are frozen and stored. After the intense cancer treatment destroys the remaining diseased cells (and unfortunately, the healthy marrow), the stored stem cells are thawed and infused back into the patient's body to rebuild the immune system.
Main Advantage: There is virtually no risk of the body rejecting the cells or developing a serious complication called Graft-versus-Host Disease (GvHD), because the cells are the patient's own.
Commonly used for: Hodgkin lymphoma, non-Hodgkin lymphoma, and multiple myeloma.
2. Allogeneic Bone Marrow Transplant
In an allogeneic transplant, the stem cells come from a donor. The donor's tissue type must closely match the patient's genetic markers (HLA matching) to reduce the risk of complications.
How it works: The patient undergoes chemotherapy or radiation to destroy their diseased bone marrow. Then, they receive the healthy stem cells harvested from the donor.
Types of Donors:
Matched Related Donor: Usually a sibling who is a perfect genetic match.
Matched Unrelated Donor (MUD): An anonymous volunteer donor found through a national or international bone marrow registry.
Haploidentical Transplant: A "half-match" donor, typically a parent, child, or sibling.
Umbilical Cord Blood Transplant: Stem cells are taken from a newborn's umbilical cord blood after birth and stored in a cord blood bank for whoever needs them.
Main Benefit: The donor cells can create a new immune system that actively fights any remaining cancer cells (known as the "graft-versus-tumor" effect).
Commonly used for: Leukemias (AML, ALL), myelodysplastic syndromes (MDS), and certain non-cancerous blood disorders like aplastic anemia or sickle cell disease.