The bone marrow—the sponge-like
tissue found in the center of certain bones—contains stem cells
that are the precursors of white blood cells, red blood cells,
and platelets. These blood cells are vital for normal body
functions, such as oxygen transport, defense against infection
and disease, and clotting. Blood cells have a limited life span
and are constantly being replaced; therefore, the production of
healthy stem cells is vital.
In association with certain
diseases, stem cells may produce too many, too few, or abnormal
blood cells. Also, medical treatments may destroy stem cells or
alter blood cell production. Blood cell abnormalities can be
life-threatening. Bone marrow transplantation involves
extracting bone marrow containing normal stem cells or
peripheral stem cells from a healthy donor, and transferring it
to a recipient whose body cannot manufacture proper quantities
of normal blood cells. The goal of the transplant is to rebuild
the recipient's blood cells and immune system and hopefully cure
the underlying disease.
Purpose
A person's red blood cells, white
blood cells, and platelets may be destroyed or may be abnormal
due to disease. Also, certain medical therapies, particularly
chemotherapy or radiation therapy, may destroy a person's stem
cells. The consequence to a person's health is severe. Under
normal circumstances, red blood cells carry oxygen throughout
the body and remove carbon dioxide from the body's tissues.
White blood cells form the cornerstone of the body's immune
system and defend it against infection. Platelets limit bleeding
by enabling the blood to clot if a blood vessel is damaged.
A bone marrow transplant is used
to rebuild the body's capacity to produce these blood cells and
bring their numbers to normal levels. Illnesses that may be
treated with a bone marrow transplant include both cancerous and
non-cancerous diseases.
Cancerous diseases may or may not
specifically involve blood cells; but, cancer treatment can
destroy the body's ability to manufacture new blood cells. Bone
marrow transplantation may be used in conjunction with
additional treatments, such as chemotherapy, for various types
of leukemia, Hodgkin's disease, lymphoma, breast and ovarian
cancer, renal cell carcinoma, myelodysplasia, myelofibrosis,
germ cell cancer, and other cancers. Non-cancerous diseases for
which bone marrow transplantation can be a treatment option
include aplastic anemia, sickle cell disease, thalassemia, and
severe immunodeficiency.
Demographics
The decision to prescribe a bone
marrow transplant is based on the patient's age, general
physical condition, diagnosis and stage of the disease. A
person's age or state of health may prohibit use of a bone
marrow transplant. The typical cut-off age for a transplant
ranges from 40 to 55 years; however, a person's general health
is usually the more important factor. Before undergoing a bone
marrow transplant, the bone marrow transplant team will ensure
that the patient understands the potential benefits and risks of
the procedure.
The first successful bone marrow
transplant took place in 1968 at the University of Minnesota.
The recipient was a child with severe combined immunodeficiency
disease and the donor was a sibling. In 1973, the first
unrelated bone marrow transplant was performed at Memorial
Sloan-Kettering Cancer Center in New York City on a
five-year-old patient with severe combined immunodeficiency
disease. In 1984, Congress passed the National Organ Transplant
Act which included language to evaluate unrelated marrow
transplantation and determine if a national donor registry was
feasible. The National Bone Marrow Donor Registry (NBMDR), now
called the National Marrow Donor Program (NMDP), was established
in 1986.
The NMDP Network has more than
four million volunteer donors and has Donor Centers and
Transplant Centers in 14 countries. About 40% of the transplants
facilitated by the NMDP involve either a U.S. patient receiving
bone marrow and/or stem cells from an international donor, or an
international patient receiving bone marrow/stem cells from a
U.S. donor. The NMDP coordinates more than 130 stem cell
transplants each month. Approximately 12,000 total bone
marrow/stem cell transplants have been performed since the
organization was founded.
Types of Bone Marrow Transplants -
Autologous and Allogeneic
Transplants
Two important requirements for a
bone marrow transplant are the donor and the recipient.
Sometimes, the donor and the recipient may be the same person.
This type of transplant is called an autologous transplant. It
is typically used in cases in which a person's bone marrow is
generally healthy but will be destroyed due to medical treatment
for diseases such as breast cancer and Hodgkin's disease.
Autologous transplants are also possible if the disease
affecting the bone marrow is in remission. If a person's bone
marrow is unsuitable for an autologous transplant, the bone
marrow must be derived from another person in an allogeneic
transplant.
An allogeneic bone marrow donor
may be a family member or an unrelated donor. The donated bone
marrow/peripheral stem cells must perfectly match the patient's
bone marrow. The matching process is called HLA (human leukocyte
antigens). Antigens are markers in cells that stimulate antibody
production. HLA antigens are proteins on the surface of bone
marrow cells. HLA testing is a series of blood tests that
evaluate the closeness of tissue between the donor and
recipient. If the donor and the recipient have very dissimilar
antigens, the recipient's immune system regards the donor's bone
marrow cells as invaders and launches a destructive attack
against them. Such an attack negates any benefits offered by the
transplant.
Who Performs the
Procedure and Where Is It Performed?
Bone marrow transplant physicians specifically
trained in bone marrow transplantation should perform this
procedure. Bone marrow transplant physicians have extensive
experience in hematology/oncology and bone marrow transplant.
Selecting a transplant center
that has a multi-disciplinary team of specialists is important.
The bone marrow transplant team should include transplant
physicians, infectious disease specialists, pharmacologists,
registered nurses and transplant coordinators. Other transplant
team members may include registered dietitians, social workers,
and financial counselors.
When selecting a transplant
center, the patient should find out where the center is
accredited. Some examples of accrediting organizations include
The Foundation for the Accreditation of Cellular Therapy, the
American Association of Blood Banking, the National Marrow Donor
Program, and other state-level accreditation organizations.
Choosing a transplant center with
experience is important. Here are some questions to consider
when choosing a transplant center:
- How many bone marrow
transplants are performed annually and what are the
outcomes/survival rates of those transplants?
- Does the transplant center
perform transplants for the patient's type of disease? How
many has it performed to date?
- Does the transplant center
have experience treating patients the same age as the
patient considering transplant?
- What is the required patient
and unrelated donor HLA matching level at this center?
- How much does a typical bone
marrow transplant cost at this facility?
- Is financial help available?
- If the transplant center is
far from the patient's home, will accommodations be provided
for caregivers?
Questions to Ask the
Doctor
- What type of bone marrow transplant is
recommended for my condition?
- What are the potential
benefits of bone marrow transplantation?
- Where does transplanted bone
marrow come from?
- What types of tests are
required to screen me for the bone marrow transplant?
- What is HLA/histocompatibility
matching?
- What types of tests are used
to screen potential bone marrow or peripheral stem donors?
- Are bone marrow or
peripheral stem cell donors compensated?
- After my bone marrow
transplant, can I contact an unrelated donor? How can I do
this?
- Will my insurance provider
cover the expenses of my bone marrow transplant?
- What types of questions
should I ask my insurance provider to determine if the
medical expenses of my bone marrow transplant will be
covered?
- Whose insurance covers the
medical expenses of the donor?
- How long does the insurance
clearance process take?
- After bone marrow
transplantation is approved as a treatment option for me,
how long will I have to wait before I can receive the bone
marrow transplant?
- What type of preparative
regimen will I have before the bone marrow transplant?
- What are the side effects of
the preparative regimen?
- What types of precautions
must I follow before and after my bone marrow transplant?
- Will I have to have blood
transfusions during the transplantation process?
- What are the risks and
potential complications of bone marrow transplantation?
- What is Graft-versus-Host
disease (GVHD) and can it be prevented?
- What are the signs of GVHD,
rejection, and infection?
- How and when will I know if
the bone marrow transplant was successful?
- How long will I have to stay
in the hospital?
- What types of resources are
available to me during my hospital stay and during my
recovery at home?
- What types of medications
will I have to take after my bone marrow transplant? How
long will I have to take them?
- After I go home, how long
will it take me to recover?
- When can I resume my normal
activities?
- What type of follow-up care
is recommended? How often will I need to go to follow-up
appointments?
- Can I receive follow-up care
from my primary physician, or do I need to go back to the
center where I had my bone marrow transplant?
- If I live far away from my
transplant center, do I have to stay near the transplant
center during my recovery after I'm discharged? If yes, for
how long? Will I receive help in making accommodations?
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The Nuts and
Bolts of Bone Marrow Transplants
Bone marrow
transplantation (BMT) is a relatively new medical procedure
being used to treat diseases once thought incurable. Since its
first successful use in 1968, BMTs have been used to treat
patients diagnosed with leukemia, aplastic anemia, lymphomas
such as Hodgkin's disease, multiple myeloma, immune deficiency
disorders and some solid tumors such as breast and ovarian
cancer.
In 1991, more than
7,500 people underwent BMTs nationwide. Although BMTs now save
thousands of lives each year, 70 percent of those needing a BMT
using donor marrow are unable to have one because a suitable
bone marrow donor cannot be found.
WHAT IS BONE
MARROW?
Bone marrow is a
spongy tissue found inside bones. The bone marrow in the breast
bone, skull, hips, ribs and spine contains stem cells that
produce the body's blood cells. These blood cells include white
blood cells (leukocytes), which fight infection; red blood cells
(erythrocytes), which carry oxygen to and remove waste products
from organs and tissues; and platelets, which enable the blood
to dot
WHY TRANSPLANT?
In patients with
leukemia, aplastic anemia, and some immune deficiency diseases,
the stem cells in the bone marrow malfunction, producing an
excessive number of defective or immature blood cells (in the
case of leukemia) or low blood cell counts (in the case of
aplastic anemia). The immature or defective blood cells
interfere with the production of normal blood cells, accumulate
in the bloodstream and may invade other tissues.
Large doses of
chemotherapy and/or radiation are required to destroy the
abnormal stem cells and abnormal blood cells. These therapies,
however, not only kill the abnormal cells but can destroy normal
cells found in the bone marrow as well. Similarly, aggressive
chemotherapy used to treat some lymphomas and other cancers can
destroy healthy bone marrow. A bone marrow transplant enables
physicians to treat these diseases with aggressive chemotherapy
and/or radiation by allowing replacement of the diseased or
damaged bone marrow after the chemotherapy/radiation treatment.
While bone marrow
transplants do not provide 100 percent assurance that the
disease will not recur, a transplant can increase the likelihood
of a cure or at least prolong the period of disease-free
survival for many patients.
TYPES OF
TRANSPLANTS
In a bone marrow
transplant, the patient's diseased bone marrow is destroyed and
healthy marrow is infused into the patient's blood-stream. In a
successful transplant, the new bone marrow migrates to the
cavities of the large bones, engrafts and begins producing
normal blood cells.
If bone marrow from
a donor is used, the transplant is called an "allogeneic" BMT,
or "syngeneic" BMT if the donor is an identical twin. In an
allogeneic BMT, the new bone marrow infused into the patient
must match the genetic makeup of the patient's own marrow as
perfectly as possible. Special blood tests are conducted to
determine whether or not the donor's bone marrow matches the
patient's. If the donor's bone marrow is not a good genetic
match, it will perceive the patient's body as foreign material
to be attacked and destroyed. This condition is known as
graft-versus-host disease (GVHD) and can be life-threatening.
Alternatively, the patient's immune system may destroy the new
bone marrow. This is called graft rejection.
There is a 35
percent chance that a patient will have a sibling whose bone
marrow is a perfect match. If the patient has no matched
sibling, a donor may be located in one of the international bone
marrow donor registries, or a mis-matched or autologous
transplant may be considered.
In some cases,
patients may be their own bone marrow donors. This is called an
autologous BMT and is possible if the disease afflicting the
bone marrow is in remission or if the condition being treated
does not involve the bone marrow (e.g. breast cancer, ovarian
cancer, Hodgkin's disease, non-Hodgkin's lymphoma, and brain
tumors). The bone marrow is extracted from the patient prior to
transplant and may be "purged" to remove lingering malignant
cells (if the disease has afflicted the bone marrow).
PREPARING FOR THE
TRANSPLANT
A successful
transplant requires the patient be healthy enough to undergo the
rigors of the transplant procedure. Age, general physical
condition, the patient's diagnosis and the stage of the disease
are all considered by the physician when determining whether a
person should undergo a transplant.
Prior to a bone
marrow transplant, a battery of tests is carried out to ensure
the patient is physically capable of undergoing a transplant.
Tests of the patient's heart, lung, kidney and other vital organ
functions are also used to develop a patient "baseline" against
which post-transplant tests can be compared to determine if any
body functions have been impaired. The pre-transplant tests are
usually done on an outpatient basis.
A successful bone
marrow transplant requires an expert medical team - doctors,
nurses, and other support staff - who are experienced in bone
marrow transplants, can promptly recognize problems and emerging
side effects, and know how to react swiftly and properly if
problems do arise. A good bone marrow transplant program will
also recognize the importance of providing patients and their
families with emotional and psychological support before, during
and after the transplant, and will make personal and other
support systems readily available to families for this purpose.
BONE MARROW HARVEST
Regardless of
whether the patient or a donor provides the bone marrow used in
the transplant, the procedure used to collect the marrow - the
bone marrow harvest - is the same. The bone marrow harvest takes
place in a hospital operating room, usually under general
anesthesia. It involves little risk and minimal discomfort.
While the patient is
under anesthesia, a needle is inserted into the cavity of the
rear hip bone or "iliac crest" where a large quantity of bone
marrow is located. The bone marrow a thick, red liquid - is
extracted with a needle and syringe. Several skin punctures on
each hip and multiple bone punctures are usually required to
extract the requisite amount of bone marrow. There are no
surgical incisions or stitches involved - only skin punctures
where the needle was inserted.
The amount of bone
marrow harvested depends on the size of the patient and the
concentration of bone marrow cells in the donor's blood. Usually
one to two quarts of marrow and blood are harvested. While this
may sound like a lot, it really only represents about 2% of a
person's bone marrow, which the body replaces in four weeks.
When the anesthesia
wears off, the donor may feel some discomfort at the harvest
site. The pain will be similar to that associated with a hard
fall on the ice and can usually be controlled with Tylenol.
Donors who are not also the BMT patient are usually discharged
after an overnight stay and can fully resume normal activities
in a few days.
For autologous
transplants, the harvested bone marrow will be frozen (cryopreserved)
and stored at a temperature between -80 and -196 degrees
centigrade until the day of transplant. It may first be "purged"
to remove residual cancerous cells that can't be easily
identified under the microscope (see page 30).
In allogeneic BMTs,
the bone marrow may be treated to remove "T-cells" (T cell
depletion) to reduce the risk of graft-versus-host disease (see
page 94). It will then be transferred directly to the patient's
room for infusion.
PREPARATIVE REGIMEN
A patient admitted
to the bone marrow transplant unit will first undergo several
days of chemotherapy and/or radiation which destroys bone marrow
and cancerous cells and makes room for the new bone marrow. This
is called the conditioning or preparative regimen. The exact
regimen of chemotherapy and/or radiation varies according to the
disease being treated and the "protocol" or preferred treatment
plan of the facility where the BMT is being performed.
Prior to
conditioning, a small flexible tube called a catheter (sometimes
called a "Hickman®" or central venous line) will be inserted
into a large vein in the patient's chest just above the heart.
This tube enables the medical staff to administer drugs and
blood products to the patient painlessly, and to withdraw the
hundreds of blood samples required during the course of
treatment without inserting needles into the patient's arms or
hands.
The dosage of
chemotherapy and/or radiation given to patients during
conditioning is much stronger than dosages administered to
patients with the same disease who are not undergoing a BMT.
Patients may become weak, irritable and nauseous. Most BMT
centers administer anti-nausea medications to minimize
discomfort.
THE TRANSPLANT
A day or two
following the chemotherapy and/or radiation treatment, the
transplant will occur. The bone marrow is infused into the
patient intravenously in much the same way that any blood
product is given. The transplant is not a surgical procedure. It
takes place in the patient's room, not an operating room.
Patients are checked
frequently for signs of fever, chills, hives and chest pains
while the bone marrow is being infused. When the transplant is
completed, the days and weeks of waiting begin.
ENGRAFTMENT
The two to four
weeks immediately following transplant are the most critical.
The high-dose chemotherapy and/or radiation given to the patient
during conditioning will have destroyed the patient's bone
marrow, crippling the body's "immune" or defense system. As the
patient waits for the transplanted bone marrow to migrate to the
cavities of the large bones, set up housekeeping or "engraft,"
and begin producing normal blood cells, he or she will be very
susceptible to infection and excessive bleeding. Multiple
antibiotics and blood transfusions will be administered to the
patient to help prevent and fight infection. Transfusions of
platelets will be given to prevent bleeding. Allogeneic patients
will receive additional medications to prevent and control
graft-versus-host disease.
Extraordinary
precautions will be taken to minimize the patient's exposure to
viruses and bacteria. Visitors and hospital personnel will wash
their hands with antiseptic soap and, in some cases, wear
protective gowns, gloves and/or masks while in the patient's
room. Fresh fruits, vegetables, plants and cut flowers will be
prohibited in the patient's room since they often carry fungi
and bacteria that pose a risk of infection. When leaving the
room, the patient may wear a mask, gown and gloves as a barrier
against bacteria and virus, and as a reminder to others that he
or she is susceptible to infection. Blood samples will be taken
daily to determine whether or not engraftment has occurred and
to monitor organ function. When the transplanted bone marrow
finally engrafts and begins producing normal blood cells, the
patient will gradually be taken off the antibiotics, and blood
and platelet transfusions will generally no longer be required.
once the bone marrow is producing a sufficient number of healthy
red blood cells, white blood cells and platelets, the patient
will be discharged from the hospital, provided no other
complications have developed. BMT patients typically spend four
to eight weeks in the hospital.
WHAT A PATIENT
FEELS DURING THE TRANSPLANT
A bone marrow
transplant is a physically, emotionally, and psychologically
taxing procedure for both the patient and family. A patient
needs and should seek as much help as possible to cope with the
experience. "Toughing it out" on your own is not the smartest
way to cope with the transplant experience.
The bone marrow
transplant is a debilitating experience. Imagine the symptoms of
a severe case of the flu - nausea, vomiting, fever, diarrhea,
extreme weakness. Now imagine what it's like to cope with the
symptoms not just for several days, but for several weeks. That
approximates what a BMT patient experiences during
hospitalization.
During this period
the patient will feel very sick and weak. Walking, sitting up in
bed for long periods of time, reading books, talking on the
phone, visiting with friends or even watching TV may require
more energy than the patient has to spare.
Complications can
develop after a bone marrow transplant such as infection,
bleeding, graft-versus-host disease, or liver disease, which can
create additional discomfort. The pain, however, is usually
controllable by medication. In addition, mouth sores can develop
that make eating and swallowing uncomfortable. Temporary mental
confusion sometimes occurs and can be quite frightening for the
patient who may not realize it's only temporary. The medical
staff will help the patient deal with these problems.
HANDLING EMOTIONAL
STRESS
In addition to the
physical discomfort associated with the transplant experiance
there is emotional and psychological discomfort as well. Some
patients find the emotional and psychological stress more
problematic than the physical discomfort.
The psychological
and emotional stress stems from several factors. First, patients
undergoing transplants are already traumatized by the news that
they have a life-threatening disease. While the transplant
offers hope for their recovery, the prospect of undergoing a
long, arduous medical procedure is still not pleasant and
there's no guarantee of success.
Second, patients
undergoing a transplant can feel quite isolated. The special
precautions taken to guard against infection while the immune
system is impaired can leave a patient feeling detached from the
rest of the world and cut off from normal human contact. The
patient is housed in a private room, sometimes with special
air-filtering equipment to purify the air. The number of
visitors is restricted and visitors are asked to wear gloves,
masks and/or other protective clothing to inhibit the spread of
bacteria and virus while visiting the patient. When the patient
leaves the room, he or she may be required to wear a protective
mask, gown and/or gloves as a barrier against infection. This
feeling of isolation comes at the very time in a patient's life
when familiar surroundings and close physical contact with
family and friends are most needed.
'Helplessness" is
also a common feeling among bone marrow transplant patients,
which can breed further feelings of anger or resentment. For
many, it's unnerveing to be totally dependent on strangers for
survival, no matter how competent they may be. The fact that
most patients are unfamiliar with the medical jargon used to
describe the transplant procedure compounds the feeling of
helplessness. Some also find it embarrassing to be dependent on
strangers for help with basic daily functions such as using the
washroom.
The long weeks of
waiting for the transplanted marrow to engraft, for blood counts
to return to safe levels, and for side effects to disappear
increase the emotional trauma. Recovery can be like a roller
coaster ride: one day a patient may feel much better, only to
awake the next day feeling as sick as ever.
LEAVING THE
HOSPITAL
After being
discharged from the hospital, a patient continues recovery at
home (or at lodging near the transplant center if the patient is
from out of town) for two to four months. Patients usually
cannot return to full-time work for up to six months after the
transplant.
Though patients will
be well enough to leave the hospital, their recovery will be far
from over. For the first several weeks the patient may be too
weak to do much more than sleep, sit up, and walk a bit around
the house. Frequent visits to the hospital or associated clinic
will be required to monitor the patient's progress, and to
administer any medications and/or blood products needed. It can
take six months or more from the day of transplant before a
patient is ready to fully resume normal activities.
During this period,
the patient's white blood cell counts are often too low to
provide normal protection against the viruses and bacteria
encountered in everyday life. Contact with the general public is
therefore restricted. Crowded movie theaters, grocery stores,
department stores, etc. are places recovering BMT patients avoid
during their recuperation. Often patients will wear protective
masks when venturing outside the home.
A patient will
return to the hospital or clinic as an outpatient several times
a week for monitoring, blood transfusions, and administration of
other drugs as needed. Eventually, the patient becomes strong
enough to resume a normal routine and to look forward to a
productive, healthy life.