X
X-ray
A type
of high-energy radiation. In low doses, X-rays are used to
diagnose diseases by making pictures of the inside of the
body. In high doses, X-rays are used to treat cancer.
X-ray therapy
The
use of high-energy radiation from X-rays to kill cancer
cells and shrink tumors. Radiation may come from a machine
outside the body (external-beam radiation therapy) or from
materials called radioisotopes. Radioisotopes produce
radiation and can be placed in or near the tumor or in the
area near cancer cells. This type of radiation treatment is
called internal radiation therapy, implant radiation,
interstitial radiation, or brachytherapy.
Systemic
radiation therapy uses a radioactive substance, such as a
radiolabeled monoclonal antibody, that circulates throughout
the body. X-ray therapy is also called radiation therapy,
radiotherapy and irradiation.
Xeloda
A drug used to treat stage III colon cancer in patients who
had surgery to remove the cancer. It is also being studied
in the treatment of other types of cancer. Xeloda belongs to
the family of drugs called antimetabolites. Also called
capecitabine.
xenograft
The
cells of one species transplanted to another species.
xeroderma pigmentosum
A genetic condition marked by an extreme sensitivity to
ultraviolet radiation, including sunlight. People with
xeroderma pigmentosum are not able to repair skin damage
from the sun and other sources of ultraviolet radiation, and
have a very high risk of skin cancer.
xerogram
A
picture of the body recorded on paper rather than on film.
Also called a xeroradiograph.
xeroradiograph
A
picture of the body recorded on paper rather than on film.
Also called a xerogram.
xeroradiography
A type of x-ray in which a picture of the body is recorded
on paper rather than on film.
xerostomia
Dry
mouth. It occurs when the body is not able to make enough
saliva.
XK469R
A
substance that is being studied in the treatment of
leukemia. It belongs to the family of drugs called
topoisomerase inhibitors.
XR9576
A
substance that is being studied in the treatment of cancer.
It may help tumor cells respond again to drugs they have
become resistant (unable to respond) to. XR9576 belongs to
the families of drugs called multidrug resistance inhibitors
and P-glycoprotein antagonists. Also called tariquidar.
XRP9881
A
substance that is being studied in the treatment of breast
cancer. It belongs to the family of drugs called taxane
derivatives.
Xyotax
A form of the anticancer drug paclitaxel combined with a
protein called poliglumex that may have fewer side effects
and work better than paclitaxel. It is being studied in the
treatment of breast cancer, ovarian cancer, lung cancer, and
other types of cancer. It belongs to the family of drugs
called mitotic inhibitors. Also called paclitaxel poliglumex,
paclitaxel polyglutamate and CT-2103.
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