What is the difference between Blood Stem Cells and Marrow?
The cells collected for transplant are called Hematopoietic Stem Cells (hee-MAT-oh-poy-ETT-ick) and these can be found both in the circulating blood (peripheral blood stem cells) or in the bone marrow. The cells are collected for transplant are the same, but the method of collecting them may either be from the peripheral blood or from the marrow. Marrow is typically recommended for infants and children and is less than 10% of collections. More than 90% of collections today use the peripheral blood stem cell process.
What is Peripheral Blood Stem Cell donation?
A peripheral blood stem cell (PBSC) donation is an outpatient procedure conducted at a collection center, blood clinic, or hospital. Your blood stem cells are collected from your circulating blood via a needle in your arm. Blood is drawn from one arm, passes through the apheresis machine where the stem cells are collected, then the remaining blood is returned to your other arm. Stem cell donors receive Filgrastim for five days before donating, to encourage the development of extra stem cells and to move them into the blood stream. PBSC donation typically takes four to six hours, and about 90% of transplants today are done through PBSC donation.
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What is Marrow Donation?
Marrow donation is an outpatient procedure conducted in a hospital. You are under general anesthesia and the process takes one to two hours. Donors generally go home after the procedure. Marrow is collected from the iliac crest of your pelvic bone (hip bone) using a syringe. These transplants make up only about 10% of transplants today, and are usually requested for young children.
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Is marrow collected from your spine?
No, marrow is not collected from the spine. Marrow is found in the large bones of the legs and arms and within the pelvic (hip) bone. For transplants, it is always collected from the iliac crest of the pelvic bone – the spine is not involved.
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Can I choose which type of donation to do?
The type of collection – blood stem cells or marrow – is requested by the transplant physician, who will choose the method to give the best results for the patient. If you express a preference for one method over the other, we will pass the request on to the transplant physician.
Are there any side effects from donating blood stem cells or marrow?
There may be some minor side effects from either form of donation, but these donations have been done safely for decades. Before donating blood stem cells, donors receive a medication called Filgrastim to stimulate the growth of stem cells and encourage them to move into the circulating blood. Filgrastim has been used safely for this purpose for more than 30 years. For some donors, it produces headaches and aching bones, which are treatable with Tylenol and dissipate soon after donating. Some donors experience bruising on their arms where the needles were inserted. Marrow donors do not take Filgrastim, but after donating may feel a back or hip ache for several days, treatable with Tylenol. For both types of collection, donors are asked to refrain from exercise and lifting heavy objects for a week or so as they recover.
Will my stem cells or marrow grow back?
Yes. Like most cells in your body, your blood stem cells and marrow are constantly producing new cells as older cells die off. Removing a small amount of these cells for donation does not have any adverse impact on you. For stem cell donors, the use of Filgrastim produces extra stem cells that are collected during donation, leaving donors where about the same number of cells. Marrow regenerates normally on its own within a few weeks.
Am I the only donor for this patient? Do they have other matches?
Gift of Life does not have this information. The transplant doctor is the person who has all the search results and knows if there is more than one donor. Because matches between people are so rare, it is possible that you are the only match and this patient’s only hope.
What if I wasn’t the best match for this patient? Can I still donate someday?
Yes, if you are called as a match but are not selected to donate this time, your profile remains in the registry and you may be called again in the future for another patient. Note that most donors requested are between 18 and 35 years old. You will remain in the registry until your 61st birthday, and may still be called at any time.
My donation was cancelled – why did that happen?
When a donation is cancelled it is typically because the patient and their physician chose a different course of treatment, or they may not be ready for transplant at this time. Your profile remains in the registry and you may be called again in the future.
Can I donate stem cells or marrow more than once, or to more than one person?
Donors are sometimes asked to give a booster of white blood cells (a donor leukocyte infusion) a few months after the transplant to help their recipient in the recovery process.
More rarely, a donor may match with an entirely different patient and have the opportunity to save another life.