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A bone marrow transplant is a procedure to replace damaged or destroyed bone marrow with healthy bone marrow stem cells.
Bone marrow is the soft, fatty tissue inside your bones. The bone marrow produces blood cells. Stem cells are immature cells in the bone marrow that give rise to all of your different blood cells.
Transplant - bone marrow; Stem cell transplant; Hematopoietic stem cell transplant; Reduced intensity, nonmyeloablative transplant; Mini transplant; Allogenic bone marrow transplant; Autologous bone marrow transplant; Umbilical cord blood transplant
Before the transplant, chemotherapy, radiation, or both may be given. This may be done in two ways:
Ablative (myeloablative) treatment: High-dose chemotherapy, radiation, or both are given to kill any cancer cells. This also kills all healthy bone marrow that remains, and allows new stem cells to grow in the bone marrow.
Reduced intensity treatment, also called a mini transplant: People receive lower doses of chemotherapy and radiation before a transplant. This allows older people, and those with other health problems to have a transplant.
There are 3 kinds of bone marrow transplants:
Autologous bone marrow transplant: The term auto means self. Stem cells are removed from you before you receive high-dose chemotherapy or radiation treatment. The stem cells are stored in a freezer. After high-dose chemotherapy or radiation treatments, your stems cells are put back in your body to make normal blood cells. This is called a rescue transplant.
Allogeneic bone marrow transplant: The term allo means other. Stem cells are removed from another person, called a donor. Most times, the donor's genes must at least partly match your genes. Special tests are done to see if a donor is a good match for you. A brother or sister is most likely to be a good match. Sometimes parents, children, and other relatives are good matches. Donors who are not related to you, yet still match, may be found through national bone marrow registries.
Umbilical cord blood transplant: This is a type of allogeneic transplant. Stem cells are removed from a newborn baby's umbilical cord right after birth. The stem cells are frozen and stored until they are needed for a transplant. Umbilical cord blood cells are very immature so there is less of a need for perfect matching. Due to the smaller number of stem cells, blood counts take much longer to recover.
A stem cell transplant is usually done after chemotherapy and radiation is complete. The stem cells are delivered into your bloodstream usually through a tube called a central venous catheter. The process is similar to getting a blood transfusion. The stem cells travel through the blood into the bone marrow. Most times, no surgery is needed.
Donor stem cells can be collected in two ways:
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 both hip bones. The amount of marrow removed depends on the weight of the person who is receiving it.
Leukapheresis: First, the donor is given several days of shots to help stem cells move from the bone marrow into the blood. During leukapheresis, blood is removed from the donor through an IV line. The part of white blood cells that contains stem cells is then separated in a machine and removed to be later given to the recipient. The red blood cells are returned to the donor.
Why the Procedure Is Performed
A bone marrow transplant replaces bone marrow that is either not working properly or has been destroyed (ablated) by chemotherapy or radiation. Doctors believe that for many cancers, the donor's white blood cells may attack any remaining cancer cells, similar to when white cells attack bacteria or viruses when fighting an infection.
Your doctor may recommend a bone marrow transplant if you have:
Certain cancers, such as leukemia, lymphoma, myelodysplasia, and multiple myeloma
Inflammation and soreness in the mouth, throat, esophagus, and stomach, called mucositis
Stomach problems, including diarrhea, nausea, and vomiting
Before the Procedure
Your health care provider will ask about your medical history and do a physical exam. You will have many tests before treatment begins.
Before transplant, you will have one or two tubes, called catheters, inserted into a blood vessel in your neck or arms. This tube allows you to receive treatments, fluids, and sometimes nutrition. It is also used to draw blood.
Your provider will likely discuss the emotional stress of having a bone marrow transplant. You may want to meet with a counselor. It is important to talk to your family and children to help them understand what to expect.
You will need to make plans to help you prepare for the procedure and handle tasks after your transplant:
Find housing for yourself or your family near the hospital, if needed
After the Procedure
A bone marrow transplant is usually done in a hospital or medical center that specializes in such treatment. Most of the time, you stay in a special bone marrow transplant unit in the center. This is to limit your chance of getting an infection.
Depending on the treatment and where it is done, all or part of an autologous or allogeneic transplant may be done as an outpatient. This means you do not have to stay in the hospital overnight.
How long you stay in the hospital depends on:
How much chemotherapy or radiation you received
The type of transplant
Your medical center's procedures
While you are in the hospital, you will be isolated because of the increased risk of infection. The health care team will closely monitor your blood count and vital signs.
While you are in the hospital you may:
Receive medicines to prevent or treat infections, including antibiotics, antifungals, and antiviral medicine
Need many blood transfusions
Be fed through a vein (IV) until you can eat by mouth and stomach side effects and mouth sores have gone away
The type and dosage of chemotherapy or radiation therapy you had before your transplant
Any complications you may have
A bone marrow transplant may completely or partially cure your illness. If the transplant is a success, you can go back to most of your normal activities as soon as you feel well enough. Usually it takes up to 1 year to recover fully, depending on what complications occur.
Complications or failure of the bone marrow transplant can lead to death.
Bashir Q, Champlin R. Hematopoietic stem cell transplantation. In: Niederhuber JE, Armitage JO, Doroshow JH, et al., eds. Abeloff's Clinical Oncology. 5th ed. Philadelphia, PA: Elsevier Churchill Livingstone; 2013:chap 30.
Heslop HE. Overview of hematopoietic stem cell transplantation. In: Hoffman R, Benz EJ Jr, Silberstein LE, Heslop HE, Weitz JI, Anastasi JI, eds. Hematology: Basic Principles and Practice. 6th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 104.