Words to Know: Transplants
allogeneic transplantation: a procedure where cells, tissue, or
organs are transplanted to a person from a compatible donor.
antibody crossmatch test: when blood from a donor and a recipient
are mixed. If the recipient's cells attack and kill the donated cells (a "positive"
crossmatch), the recipient has antibodies "against" the donor's cells. A "negative"
crossmatch means the donor and recipient cells are compatible.
autologous transplantation: when a patient's own stem cells are
collected, then given back to the patient after intensive therapy (like chemotherapy
bone marrow: a thick, spongy liquid inside the bones. Bone marrow
makes all kinds of blood cells: red blood cells that carry oxygen, white blood cells
that fight infections, and platelets that help blood clot.
bone marrow transplant: a procedure in which
stem cells are put into the body to start making healthy new blood, bone marrow, and
immune system cells. Also called stem cell transplant.
cells: the basic components or "building blocks" of the human
compatible: when cells, blood, etc., can be used in a transfusion
or transplant without a bad reaction (such as rejection).
conditioning therapy: when a patient gets high doses of chemotherapy
and/or radiation to kill unhealthy cells before getting a stem cell transplant.
cord blood: blood taken from the umbilical cord after a baby is
born. Cord blood can be collected and stored to supply the same kinds of blood-forming
(hematopoietic) stem cells as a bone marrow donor.
dialysis: a medical treatment that can take over the job of filtering
blood until a person's failing kidneys heal or are replaced with a kidney transplant.
donor: a person who gives blood, stem cells, or an organ for use
by someone (a recipient) who needs it.
engrafting: new, donated stem cells settle into the bone marrow
and begin to make new blood cells.
graft-versus-host disease: when newly transplanted donor cells
start attacking the patient's body.
harvesting: when doctors remove stem cells from a patient's blood
or bone marrow. It's done before treatments like chemotherapy or radiation.
hematopoietic cell: a blood-forming cell (stem cell).
HLA markers: these proteins — or markers — are found
on most cells. The immune system uses them to know which cells belong in a person's
body and which do not.
HLA typing: human leukocyte antigen (HLA) typing helps match
patients and donors for bone marrow or cord blood transplants.
immune system: this body system, which includes white blood cells
and lymph nodes, helps protect the body from disease. The immune system's many different
parts work together to fight off outside invaders like germs.
immunosuppressants: drugs or medicines that lower the body's ability
to reject a transplanted organ. Also called anti-rejection drugs.
infusion: a way to put fluids, including medicines, into the bloodstream.
Also called intravenous (IV) infusion.
match: when an organ, blood, tissue, or other donated material
is suitable for a transplant; this can depend on things like blood type, body size,
and how close the donor's hospital is to the patient's hospital.
platelets: tiny cells in the blood that help it clot.
recipient: a person (or patient) who receives blood, stem cells,
or an organ donated by someone else (a donor). Sometimes a recipient can receive their
own cells or tissue (an autologous donation).
reject, rejection: when the body doesn't recognize a transplanted
organ and doesn't know that it is helpful. The immune system's cells try to attack
it because they sense that it's foreign.
red blood cells: cells that deliver oxygen to all parts of the
body. Also called erythrocytes or RBCs.
stem cells: cells found chiefly in the bone marrow that can develop
into any of the three types of mature blood cells: red blood cells, white blood cells,
stem cell transplant: a procedure in which stem cells are put
into the body to start making healthy new blood, bone marrow, and immune system cells.
Also called bone marrow transplant.
transplant/transplantation: surgery during which an organ, tissue,
cells, or other part donated by or removed from the body of one person is put into
the body of another person.
white blood cells: these cells, part of the germ-fighting immune
system, attack invaders such as viruses and bacteria. Also called leukocytes