Health history affects the risk of developing rectal cancer.
Anything that increases your chance of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn’t mean that you will not get cancer. Talk to your doctor if you think you may be at risk for colorectal cancer.
Risk factors for colorectal cancer include the following:
Tests that examine the rectum and colon are used to detect (find) and
diagnose rectal cancer.
Tests used to diagnose
rectal cancer include the
and history: An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient’s health habits and past illnesses and treatments will also be taken.
Digital rectal exam
(DRE): An exam of the rectum. The doctor or nurse
inserts a lubricated, gloved finger into the lower part of the rectum to feel for lumps or anything else that seems unusual. In women, the vagina
may also be examined.
Colonoscopy: A procedure to look inside the rectum and colon for polyps (small pieces of bulging tissue), abnormal
areas, or cancer. A colonoscope
is a thin, tube-like instrument with a light and a lens
for viewing. It may also have a tool to remove polyps or tissue samples, which are checked under a microscope
for signs of cancer.
Biopsy: The removal
or tissues so they can be viewed under a microscope to check for signs of cancer. Tumor
tissue that is removed during the biopsy may be checked to see if the patient is likely to have the genemutation
that causes HNPCC. This may help to plan treatment. The following tests may be used:
Immunohistochemistry: A test that uses antibodies
to check for certain antigens
in a sample of tissue. The antibody is usually linked to a radioactive
substance or a dye that causes the tissue to light up under a microscope. This type of test may be used to tell the difference between different types of cancer.
Carcinoembryonic antigen (CEA) assay: A test that measures the level of CEA in the blood. CEA is released into the bloodstream from both cancer cells and normal cells. When found in higher than normal amounts, it can be a sign of rectal cancer or other conditions.
Certain factors affect prognosis
(chance of recovery) and treatment options.