- About Screening
- Screening Tests
- Screening Risks
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 cervical cancer:
- Prevention of Cervical Cancer
- Cervical Cancer Treatment
Cervical cancer is a disease in which malignant (cancer) cells form in the cervix.
The cervix is the lower, narrow end of the uterus (the hollow, pear-shaped organ where a fetus grows). The cervix leads from the uterus to the vagina (birth canal).
Cervical cancer usually develops slowly over time. Before cancer appears in the cervix, the cells of the cervix go through changes known as dysplasia, in which cells that are not normal begin to appear in the cervical tissue. Later, cancer cells start to grow and spread more deeply into the cervix and to surrounding areas.
Screening for cervical cancer using the Pap test has decreased the number of new cases of cervical cancer and the number of deaths due to cervical cancer since 1950.
Cervical dysplasia occurs more often in women who are in their 20s and 30s. Death from cervical cancer is rare in women younger than 30 years and in women of any age who have regular screenings with the Pap test. The chance of death from cervical cancer increases with age. It is highest for white women between the ages of 45 and 70 years and for black women in their 70s. Deaths from cervical cancer occur more often in black women than in white women.
Human papillomavirus (HPV) infection is the major risk factor for development of cervical cancer.
Although most women with cervical cancer have the human papillomavirus (HPV) infection, not all women with an HPV infection will develop cervical cancer. Many different types of HPV can affect the cervix and only some of them cause abnormal cells that may become cancer. Some HPV infections go away without treatment. Women who do not have regular Pap tests are at increased risk of cervical cancer.
HPV infections are spread mainly through sexual contact. Women who become sexually active at a young age and have many sexual partners are at increased risk for HPV infections.
Other risk factors for cervical cancer include:
- Giving birth to many children.
- Having many sexual partners.
- Having first sexual intercourse at a young age.
- Smoking cigarettes.
- Using oral contraceptives ("the Pill").
- Having a weakened immune system.
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.
Clinical trials that study cancer screening methods are taking place in many parts of the country. Information about ongoing clinical trials is available from the NCI Web site.
A Pap test is commonly used to screen for cervical cancer.
A Pap test is a procedure to collect cells from the surface of the cervix and vagina. A piece of cotton, a brush, or a small wooden stick is used to gently scrape cells from the cervix and vagina. The cells are viewed under a microscope to find out if they are abnormal. This procedure is also called a Pap smear. A new method of collecting and viewing cells has been developed, in which the cells are placed into a liquid before being placed on a slide. It is not known if the new method will work better than the standard method to reduce the number of deaths from cervical cancer.
After certain positive Pap test results, an HPV DNA test may be done to find out if the HPV infection that is causing the abnormal cells is one that is linked to cervical cancer. This test can help in planning further treatment.
Other screening tests are being studied in clinical trials.
Screening clinical trials are taking place in many parts of the country. Information about ongoing clinical trials is available from the NCI Web site.
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 cervical cancer screening include the following:
False-negative test results can occur.
Screening test results may appear to be normal even though cervical cancer is present. A woman 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 she has symptoms.
False-positive test results can occur.
Screening test results may appear to be abnormal even though no cancer is present. Also, some abnormal cells in the cervix never become cancer. 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 and procedures (such as colposcopy, cryotherapy, or LEEP), which also have risks. The long-term effects of these procedures on fertility and pregnancy are not known.
Your doctor can advise you about your risk for cervical cancer and your need for screening tests.
Studies show that the number of cases of cervical cancer and deaths from cervical cancer are greatly reduced by screening with Pap tests. Screening should be done at least once every 2 or 3 years starting within 3 years after a woman begins to have sexual intercourse.
In women who have had a total hysterectomy (surgery to remove the uterus and cervix) for a condition that is not cancer, screening with the Pap test is not helpful. Women who are aged 60 years or older when they have a negative Pap test are very unlikely to have abnormal Pap tests on repeat screening.
The decision about how often to have a Pap test is best made by you and your doctor.