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Like most transplants, the stem cells must be a genetic match with the patients to be accepted by the body’s immune system. It goes without saying that a patient’s own cord blood will be a 100% match. The second highest chance of a genetic match comes from siblings.
Chemotherapy and radiation therapy generally affect cells that divide rapidly. They are used to treat cancer because cancer cells divide more often than most healthy cells. However, because bone marrow cells also divide frequently, high-dose treatments can severely damage or destroy the patient’s bone marrow. Without healthy bone marrow, the patient is no longer able to make the blood cells needed to carry oxygen, fight infection, and prevent bleeding. BMT and PBSCT replace stem cells destroyed by treatment. The healthy, transplanted stem cells can restore the bone marrow’s ability to produce the blood cells the patient needs.
Cord Blood banking is a confusing topic. Many parents get bombarded with information when searching to see if cord blood banking is right for them. There is information that private cord blood banking companies, like Viacord and Cord Blood Registry, will not tell you, until now.
Several research teams have reported studies in animals suggesting that cord blood can repair tissues other than blood, in diseases ranging from heart attacks to strokes. These findings are controversial: scientists often cannot reproduce such results and it is not clear HOW cord blood may be having such effects. When beneficial effects are observed they may be very slight and not significant enough to be useful for developing treatments. If there are positive effects, they might be explained not by cord blood cells making nerve or heart cells, but by the cells in the cord blood releasing substances that help the body repair damage.
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The stem cells used in BMT come from the liquid center of the bone, called the marrow. In general, the procedure for obtaining bone marrow, which is called “harvesting,” is similar for all three types of BMTs (autologous, syngeneic, and allogeneic). The donor is given either general anesthesia, which puts the person to sleep during the procedure, or regional anesthesia, which causes loss of feeling below the waist. Needles are inserted through the skin over the pelvic (hip) bone or, in rare cases, the sternum (breastbone), and into the bone marrow to draw the marrow out of the bone. Harvesting the marrow takes about an hour.
Your cells didn’t start out knowing how to come together to form your bones, heart or blood; they begun with more of a blank slate. These completely undifferentiated cells can be found during gestation, or the time the baby is in the womb, and are called embryonic stem cells. These early stage stem cells are master cells that have the potential to become any type of cell in the body.
Donors to public banks must be screened for blood or immune system disorders or other problems. With a cord blood donation, the mother’s blood is tested for genetic disorders and infections, and the cord blood also is tested after it is collected. Once it arrives at the blood bank, the cord blood is “typed.” It is tracked by a computer so that it can be found quickly for any person who matches when needed.
The blood that remains in the umbilical cord and the placenta after birth is called “cord blood”. Umbilical cord blood, umbilical cord tissue, and the placenta are all very rich sources of newborn stem cells. The stem cells in the after birth are not embryonic. Most of the stem cells in cord blood are blood-forming or hematopoietic stem cells. Most of the stem cells in cord tissue and the placenta are mesenchymal stem cells.
In 1989, Cryo-Cell International was founded in Oldsmar, FL, making it the oldest cord blood bank in the world. By 1992, it began to store cord blood. In addition to pursuing a wide variety of accreditations (AABB, cGMP, and ISO 1345), it was the first private cord blood bank in the U.S. to be awarded FACT accreditation. In 2017, it initiated a $100,000 Engraftment Guarantee (previously $75,000), the highest quality guarantee of any U.S. cord blood bank.
Once it arrives at the storage facility, the cord blood will be processed and placed in storage. The cord blood will either be completely immersed in liquid nitrogen or it will be stored in nitrogen vapor.
You’ve just visited the doctor and the good news is that you’re going to have a baby and everything looks good. Thirty years ago, your doctor may have given you a baby book and information about products that sponsors want you to buy for your new addition. Today, along with pretty much the same materials, you’ll be asked to consider saving the blood of your newborn that’s left over in the umbilical cord and placenta after the delivery. Another big decision, and possibly a costly one.
However, parents should know that a child’s own cord blood (stored at birth), would rarely be suitable for a transplant today. It could not be used at present to treat genetic diseases, for example, because the cord blood stem cells carry the same affected genes and. if transplanted, would confer the same condition to the recipient. (See the story of Anthony Dones.) In addition, most transplant physicians would not use a child’s own cord blood to treat leukemia. There are two reasons why the child’s own cord blood is not safe as a transplant source. First, in most cases of childhood leukemia, cells carrying the leukemic mutation are already present at birth and can be demonstrated in the cord blood. Thus, pre-leukemic cells may be given back with the transplant, since there is no effective way to remove them (purge) today. Second, in a child with leukemia, the immune system has already failed to prevent leukemia. Since cord blood from the same child re-establishes the child’s own immune system, doctors fear it would have a poor anti-leukemia effect.
A large challenge facing many areas of medical research and treatments is correcting misinformation. Some companies advertise services to parents suggesting they should pay to freeze their child’s cord blood in a blood bank in case it’s needed later in life. Studies show it is highly unlikely that the cord blood will ever be used for their child. However, clinicians strongly support donating cord blood to public blood banks. This greatly helps increase the supply of cord blood to people who need it.
As the research into umbilical cord blood and it’s therapeutic use for blood diseases has grown, so has the question as to whether people should privately store the cord blood of their offspring for future use. A recent paper on this issue by Mahendra Rao and colleagues advocates the practice of cord blood banking (for treatment of blood diseases) but in the context of public cord blood banks rather than a private cord blood banks. Any adult needing treated would need at least two cord blood samples that are immune compatible. So one sample will not be sufficient. A child might only need one cord blood sample but in the case of childhood leukaemia there is a risk that pre-leukemic cells are present in cord blood sample – and so the child could not use their own cells for therapy.
The University of Texas Health Science Center at Houston is conducting a pioneering FDA-regulated phase I/II clinical trial to compare the safety and effectiveness of two forms of stem cell therapy in children diagnosed with cerebral palsy. The randomized, double-blinded, placebo-controlled study aims to compare the safety and efficacy of an intravenous infusion of autologous cord blood stem cells to bone marrow stem cells.
Each cord blood bank has different directions for returning the consent form. Some banks may ask you to mail the consent form along with the health history forms or to bring the original consent form with you to the hospital. Other banks may have you finish the form at the hospital. Follow the directions from your public cord blood bank.
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Stem cells are often extracted from cord blood and bone marrow.Different cells have different life cycles, and many are constantly regenerating, but when damage occurs and the body needs to come up with a new supply of cells to heal itself, it relies on the stem cell’s ability to quickly create more cells to repair the wound. Herein lays the potential for the introduction of new stem cells to enhance or be the driving factor in the healing process.
^ a b c d e f Juric, MK; et al. (9 November 2016). “Milestones of Hematopoietic Stem Cell Transplantation – From First Human Studies to Current Developments”. Frontiers in Immunology. 7: 470. doi:10.3389/fimmu.2016.00470. PMC 5101209 . PMID 27881982.
Cord blood (short for umbilical cord blood) is the blood that remains in the umbilical cord and placenta post-delivery. At or near term, there is a maternal–fetal transfer of cells to boost the immune systems of both the mother and baby in preparation for labor. This makes cord blood at the time of delivery a rich source of stem cells and other cells of the immune system. Cord blood banking is the process of collecting the cord blood and extracting and cryogenically freezing its stem cells and other cells of the immune system for potential future medical use.
To save money, public banks will not even process a cord blood donation unless they know in advance that they are going to keep it. When the collection first arrives at the lab, it is passed through a cell counting machine. Only collections that have at least 900 million nucleated cells are kept. As a result, over 60%-80% of cord blood donations are discarded. The public bank must absorb the expense of the collection kit and delivery charges for discarded blood; typically $100 per unit.
For example, in the UK the NHS Cord Blood Bank has been collecting and banking altruistically donated umbilical cord blood since 1996. The cord blood in public banks like this is stored indefinitely for possible transplant, and is available for any patient that needs this special tissue type. There is no charge to the donor but the blood is not stored specifically for that person or their family.
Florida Hospital for Children is conducting an FDA-regulated phase I clinical trial to investigate the use of a child’s stem cells derived from their own cord blood as a treatment for acquired sensorineural hearing loss.
There is often confusion over who can use cord blood stem cells in treatment — the baby they were collected from or a sibling? The short answer is both, but it very much depends on the condition being treated. And it’s ultimately the treating physician’s decision.
Advances in treatment methods, including the use of PBSCT, have reduced the amount of time many patients must spend in the hospital by speeding recovery. This shorter recovery time has brought about a reduction in cost. However, because BMT and PBSCT are complicated technical procedures, they are very expensive. Many health insurance companies cover some of the costs of transplantation for certain types of cancer. Insurers may also cover a portion of the costs if special care is required when the patient returns home.
Most stored cord blood is discarded. At public cord blood banks, a unit of stored cord blood has a greater chance of being used to help a sick child or used toward stem cell research. Private cord blood banks, on the other hand, eventually throw away blood that a family no longer wants to store or use.
Cord blood cannot be used if the donor (baby) contains the same genetic illness as the recipient. Most cord blood banks glaze over this, but it is important to understand that the odds of using cord blood for the same child are much lower than the odds of using them for a sibling.
The first cord blood transplant was performed in Paris on October 6, 1988. Since that time, over 1 million cord blood units have been collected and stored in public and family banks all over the world.
Cord blood is currently approved by the FDA for the treatment for nearly 80 diseases, and cord blood treatments have been performed more than 35,000 times around the globe to treat cancers (including lymphoma and leukemia), anemias, inherited metabolic disorders and some solid tumors and orthopedic repair. Researchers are also exploring how cord blood has the ability to cross the blood–brain barrier and differentiate into neurons and other brain cells, which may be instrumental in treating conditions that have been untreatable up to this point. The most exciting of these are autism, cerebral palsy and Alzheimer’s.
Osteopetrosis is a genetic disease, so this means that doctors could use a sibling’s cord blood cells to treat Anthony, but they cannot use his own cells because the disease is in every cell in his body. In fact, a majority of the diseases listed in private banking firms’ marketing material as treatable with stem cells are genetic diseases.
The syringe or bag should be pre-labeled with a unique number that identifies your baby. Cord blood may only be collected during the first 15 minutes following the birth and should be processed by the laboratory within 48 hours of collection.
Marketing materials by Viacord and Cord Blood Registry, the two largest companies, do not mention that cord blood stem cells cannot be used by the child for genetic diseases, although the fine print does state that cord blood may not be effective for all of the listed conditions.
Stem cells also may be retrieved from umbilical cord blood. For this to occur, the mother must contact a cord blood bank before the baby’s birth. The cord blood bank may request that she complete a questionnaire and give a small blood sample.
Lead image of baby’s umbilical cord from Wikimedia Commons. Possible human blood stem cell image by Rajeev Gupta and George Chennell. Remaining images of blood sample bags and red blood cells from Wellcome Images.