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Table of Contents What is screening?
General Information About Esophageal Cancer
Esophageal Cancer Screening
Risks of Esophageal Cancer Screening
Get More Information From NCI
Changes to This Summary
(08/21/2007)
Questions or Comments About This Summary
About PDQ
What is screening?
Screening is looking for cancer before a person has any symptoms. This can help find
cancer at an early stage. When abnormal tissue or cancer is found early, it may
be easier to treat. By the time symptoms appear, cancer may have begun
to spread.
Scientists are trying to better understand which
people are more likely to get certain types of cancer. They also study the things
we do and the things around us to see if they cause cancer. This
information helps doctors recommend who should be screened for cancer, which
screening tests should be used, and how often the tests should be done.
It is important to remember that your doctor does not necessarily
think you have cancer if he or she suggests a screening test. Screening
tests are given when you have no cancer symptoms.
If a screening test result is abnormal, you may need to have more tests done to find out if you have cancer. These are called diagnostic tests.
Refer to the following PDQ summaries for information about prevention, diagnosis, and treatment of esophageal cancer:
Back to Top General Information About Esophageal Cancer
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Esophageal cancer is a disease in which malignant (cancer)
cells form in the tissues of the esophagus.
The esophagus is the hollow, muscular tube that moves food and
liquid from the throat to the stomach. The wall of the esophagus is made up of several layers of tissue,
including mucous membrane, muscle, and connective tissue. Esophageal cancer starts in the inside lining of the esophagus and spreads outward through the
other layers as it grows. | Enlarge | | | | The stomach and esophagus are part of the upper digestive system. |
The two most common types of esophageal cancer are named for the
type of cells that become malignant (cancerous):
- Squamous cell carcinoma: Cancer that begins in squamous cells,
the thin, flat cells lining the esophagus. This cancer is most often found
in the upper and middle part of the esophagus but can occur anywhere along the esophagus. This is also called epidermoid
carcinoma.
- Adenocarcinoma: Cancer that begins in glandular (secretory) cells.
Glandular cells in the lining of the esophagus produce and release fluids such
as mucus. Adenocarcinomas usually form in the lower part of the esophagus, near
the stomach.
Esophageal cancer is found more often in men.
Men are about three times more likely than women to have esophageal cancer. There are more new cases of esophageal adenocarcinoma each year and fewer new cases of squamous cell carcinoma. Squamous cell carcinoma of the esophagus is found more often in blacks than in whites. The chance of developing esophageal cancer increases with age.
Smoking, heavy alcohol use, and Barrett esophagus can affect the risk of developing esophageal cancer.
Anything that increases the 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. People who think they may be at risk should discuss this with their doctor.
Risk factors for squamous cell esophageal cancer include the following:
Risk factors for esophageal adenocarcinoma include the following:
Back to Top Esophageal Cancer Screening
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Tests are used to screen for different types of cancer.
Some screening tests are used because they have been shown to be helpful both in finding cancers early and in decreasing the chance of dying from these cancers. Other tests are used because they have been shown to find cancer in some people; however, it has not been proven in clinical trials that use of these tests will decrease the risk of dying from cancer.
Scientists study screening tests to find those with the fewest risks and most benefits. Cancer screening trials also are meant to show whether early detection (finding cancer before it causes symptoms) decreases a person's chance of dying from the disease. For some types of cancer, the chance of recovery is better if the disease is found and treated at an early stage.
There is no standard or routine screening test for esophageal cancer.
Screening for esophageal cancer is under study with screening clinical trials taking place in many parts of the country.
Information about ongoing clinical trials is available from the NCI Web site.
Tests that may detect (find) esophageal cancer are being studied:
Esophagoscopy
A procedure to look inside the esophagus to check for abnormal areas. An esophagoscope is inserted through the mouth or nose and down the throat into the esophagus. An esophagoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove tissue samples, which are checked under a microscope for signs of cancer. | Enlarge | | | | Esophagoscopy. A thin, lighted tube is inserted through the mouth and into the esophagus to look for abnormal areas. |
Biopsy
The removal of cells or tissues so they can be viewed under a microscope by a pathologist to check for signs of cancer. Taking biopsy samples from several different areas in the lining of the lower part of the esophagus may detect early Barrett esophagus. This procedure may be used for patients who have risk factors for Barrett esophagus.
Brush cytology
A procedure in which cells are brushed from the lining of the esophagus and viewed under a microscope to see if they are abnormal. This may be done during an esophagoscopy.
Balloon cytology
A procedure in which cells are collected from the lining of the esophagus using a deflated balloon that is swallowed by the patient. The balloon is then inflated and pulled out of the esophagus. Esophageal cells on the balloon are viewed under a microscope to see if they are abnormal.
Chromoendoscopy
A procedure in which a dye is sprayed onto the lining of the esophagus during esophagoscopy. Increased staining of certain areas of the lining may be a sign of early Barrett esophagus.
Fluorescence spectroscopy
A procedure that uses a special light to view tissue in the lining of the esophagus. The light probe is passed through an endoscope and shines on the lining of the esophagus. The light given off by the cells lining the esophagus is then measured. Malignant tissue gives off less light than normal tissue.
Back to Top Risks of Esophageal Cancer Screening
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Screening tests have risks.
Decisions about screening tests can be difficult. Not all screening tests are helpful and most have risks. Before having any screening test, you may
want to discuss the test with your doctor. It is important to know the risks of
the test and whether it has been proven to reduce the risk of dying from cancer.
The risks of esophageal cancer screening tests include the
following:
Finding esophageal cancer may not improve health or help a person live
longer.
Screening
may not improve your health or help you live longer if you have advanced esophageal cancer or if it has already spread to
other places in your body.
Some cancers never cause symptoms or become life-threatening, but if found by a screening
test, the cancer may be treated. It is not known if treatment of these cancers will help you live longer than if no treatment were given, and treatments for cancer may have serious side effects.
False-negative test results can occur.
Screening test results may appear to be normal even though esophageal cancer is present. A person who receives a false-negative test result (one that shows there is no cancer when there really is) may delay seeking medical care even if there are symptoms.
False-positive test results can occur.
Screening test results may appear to be abnormal even though no cancer is present. A false-positive test result (one that shows there is cancer when there really isn't) can cause anxiety and is usually followed by more tests (such as biopsy), which also have risks.
Side effects may be caused by the test itself.
There are rare but serious side effects that may occur with esophagoscopy and biopsy. These include the following:
- A small hole (puncture) in the esophagus.
- Problems with breathing.
- Heart attack.
- Passage of food, water, stomach acid, or vomit into the airway.
- Severe bleeding that may need to be treated in a hospital.
Back to Top Get More Information From NCI
Call 1-800-4-CANCER
For more information, U.S. residents may call the National Cancer Institute's (NCI's) Cancer Information Service toll-free at 1-800-4-CANCER (1-800-422-6237) Monday through Friday from 9:00 a.m. to 4:30 p.m. Deaf and hard-of-hearing callers with TTY equipment may call 1-800-332-8615. The call is free and a trained Cancer Information Specialist is available to answer your questions.
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The NCI's LiveHelp® online chat service provides Internet users with the ability to chat online with an Information Specialist. The service is available from 9:00 a.m. to 11:00 p.m. Eastern time, Monday through Friday. Information Specialists can help Internet users find information on NCI Web sites and answer questions about cancer.
Write to us
For more information from the NCI, please write to this address:
- NCI Public Inquiries Office
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- Bethesda, MD 20892-8322
Search the NCI Web site
The NCI Web site provides online access to information on cancer, clinical trials, and other Web sites and organizations that offer support and resources for cancer patients and their families. For a quick search, use our “Best Bets” search box in the upper right hand corner of each Web page. The results that are most closely related to your search term will be listed as Best Bets at the top of the list of search results.
There are also many other places to get materials and information about cancer treatment and services. Hospitals in your area may have information about local and regional agencies that have information on finances, getting to and from treatment, receiving care at home, and dealing with problems related to cancer treatment.
Find Publications
The NCI has booklets and other materials for patients, health professionals, and the public. These publications discuss types of cancer, methods of cancer treatment, coping with cancer, and clinical trials. Some publications provide information on tests for cancer, cancer causes and prevention, cancer statistics, and NCI research activities. NCI materials on these and other topics may be ordered online or printed directly from the NCI Publications Locator. These materials can also be ordered by telephone from the Cancer Information Service toll-free at 1-800-4-CANCER (1-800-422-6237), TTY at 1-800-332-8615.
Back to Top Changes to This Summary
(08/21/2007)
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Editorial changes were made to this summary.
Back to Top Questions or Comments About This Summary
If you have questions or comments about this summary, please send them to Cancer.gov through the Web site’s Contact Form. We can respond only to email messages written in English.
Back to Top About PDQ
PDQ is a comprehensive cancer database available on NCI's Web site.
PDQ is the National Cancer Institute's (NCI's) comprehensive cancer information database. Most of the information contained in PDQ is available online at NCI's Web site. PDQ is provided as a service of the NCI. The NCI is part of the National Institutes of Health, the federal government's focal point for biomedical research.
PDQ contains cancer information summaries.
The PDQ database contains summaries of the latest published information on cancer prevention, detection, genetics, treatment, supportive care, and complementary and alternative medicine. Most summaries are available in two versions. The health professional versions provide detailed information written in technical language. The patient versions are written in easy-to-understand, nontechnical language. Both versions provide current and accurate cancer information.
The PDQ cancer information summaries are developed by cancer experts and reviewed regularly.
Editorial Boards made up of experts in oncology and related specialties are responsible for writing and maintaining the cancer information summaries. The summaries are reviewed regularly and changes are made as new information becomes available. The date on each summary ("Date Last Modified") indicates the time of the most recent change.
PDQ also contains information on clinical trials.
A clinical trial is a study to answer a scientific question, such as whether a method of finding cancer earlier can help people to live longer. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients and those who are at risk for cancer. During screening clinical trials, information is collected about the effects of a new screening method and how well it works. If a clinical trial shows that a new method is better than one currently being used, the new method may become "standard." People who are at high risk for a certain type of cancer may want to think about taking part in a clinical trial.
Listings of clinical trials are included in PDQ and are available online at NCI's Web site. Descriptions of the trials are available in health professional and patient versions. Many cancer doctors who take part in clinical trials are also listed in PDQ. For more information, call the Cancer Information Service 1-800-4-CANCER (1-800-422-6237); TTY at 1-800-332-8615.
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