Bone marrow is the soft, fatty tissue inside your bones. Bone marrow contains stem cells, which are immature cells that become blood cells.
People with life-threatening diseases, such as leukemia, lymphoma, and myeloma can be treated with a bone marrow transplant. This is now often called a stem cell transplant. For this type of treatment, bone marrow is collected from a donor. Sometimes, people can donate their own bone marrow.
Bone marrow donation can be done either by collecting a donor's bone marrow surgically, or by removing stem cells from a donor's blood.
Stem cell transplant - donation; Allogeneic donation; Leukemia - bone marrow donation; Lymphoma - bone marrow donation; Myeloma - bone marrow donation
There are two types of bone marrow donation:
With an allogenic transplant, the donor's genes must at least partly match the person's genes. A brother or sister is most likely to be a good match. Sometimes parents, children, and other relatives are good matches. But only about 30% of people who need a bone marrow transplant can find a matching donor in their own family.
The 70% of people who do NOT have a relative who is a good match may be able to find one through a bone marrow registry. The largest one is called Be the Match (www.bethematch.org). It registers people who would be willing to donate bone marrow and stores their information in a database. Doctors can then use the registry to find a matching donor for a person who needs a bone marrow transplant.
How to Join a Bone Marrow Registry
To be listed in a bone marrow donation registry, a person must be:
People can register online or at a local donor registry drive. Those between the ages of 45 to 60 must join online. The local, in-person drives only accept donors who are younger than age 45. Their stem cells are more likely to help patients than stem cells from older people.
People who register must either:
The cells or blood is then tested for special proteins, called human leukocytes antigens (HLA). HLAs help your infection-fighting system (immune system) tell the difference between body tissue and substances that are not from your own body.
Bone marrow transplants work best if the HLAs from the donor and the patient are a close match. If a donor's HLAs match well with a person who needs a transplant, the donor must give a new blood sample to confirm the match. Then, a counselor meets with the donor to discuss the bone marrow donation process.
Donor stem cells can be collected in two ways.
Peripheral blood stem cell collection. Most donor stem cells are collected through a process called leukapheresis.
This procedure takes about 3 hours. Side effects include:
Bone marrow harvest. This minor surgery is done under general anesthesia. This means the donor will be asleep and pain-free during the procedure. The bone marrow is removed from the back of your pelvic bones. The process takes about an hour.
After a bone marrow harvest, the donor stays in the hospital until they're fully awake and can eat and drink. Side effects include:
You can resume normal activity in about a week.
There are very few risks for the donor and no lasting health effects. Your body will replace the donated bone marrow in about 4 to 6 weeks.
American Cancer Society. Stem Cell Transplant for Cancer. Cancer.org web site. Updated May 11, 2016. www.cancer.org/treatment/treatments-and-side-effects/treatment-types/stem-cell-transplant.html. Accessed September 22, 2016.
Dey BR, Spitzer TR. Haploidentical hematopoietic cell transplantation. In: Hoffman R, Benz EJ Jr., Silberstein LE, Heslop HE, Weitz JI, Anastasi J, eds. Hematology: Basic Principles and Practice. 6th ed. Philadelphia, PA: Elsevier Saunders; 2013:chap 107.
National Cancer Institute. Blood-Forming Stem Cell Transplants. Updated August 12, 2013. www.cancer.gov/about-cancer/treatment/types/stem-cell-transplant/stem-cell-fact-sheet. Accessed October 22, 2016.