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Cervical Cancer Screening
Cervical cancer is curable in its early stages. Regular screening can help detect this cancer. Cervical cancer screening uses two kinds of tests:
Current cervical cancer screening guidelines from the United States Preventive Services Task Force (USPSTF), the American Cancer Society (ACS), and the American College of Obstetricians and Gynecologists (ACOG) recommend:
Human papillomavirus (HPV) is the most common sexually transmitted disease. High-risk strains of HPV cause cervical cancer, as well as other types of cancer. Low-risk strains of HPV cause genital warts. Nearly all cases of cervical cancer are caused by HPV.
Two vaccines, Gardasil and Cervarix, are available to prevent (not treat) cervical cancer in girls and young women. Gardasil is also approved for boys. Both vaccines protect against HPV 16 and HPV 18. These two HPV strains cause the most cases of cervical cancer. Gardasil, but not Cervarix, also protects against HPV 6 and HPV 11, the two viruses that cause most cases of genital warts.
In 2014, the FDA approved a new version of the vaccine (Gardasil 9), which protects against 5 additional strains of HPV associated with cervical cancer. The FDA predicts that this new vaccine has the potential to prevent 90% of cervical, vulvar, vaginal, and anal cancers.
In 2014, the FDA approved the biologic drug bevacizumab (Avastin) for treatment of persistent, recurrent, or advanced cervical cancer. This targeted therapy is given in combination with chemotherapy.
The cervix is the lower part of the uterus (womb). It connects the uterus to the vagina. The opening of the cervix, called the os, is at the top of the vagina. It remains small and narrow, except during childbirth when it widens to allow a baby to pass from the uterus into the vagina.
The uterus is a hollow muscular organ located in the female pelvis between the bladder and rectum. The main function of the uterus is to nourish the developing fetus prior to birth. During childbirth, the cervix expands to allow the baby to pass through the birth canal (vagina).
Cervical cancer develops in the thin layer of cells called the epithelium, which cover the cervix. Cells found in this tissue have different shapes:
Cervical cancer usually begins slowly with precancerous abnormalities. If cancer develops, it generally progresses very gradually. Cervical cancer usually takes about 10 to 20 years to develop.
Cervical cancer is an often preventable type of cancer and is very treatable in its early stages. Regular Pap tests and human papillomavirus (HPV) screening can help detect this disease in its early pre-invasive states before it develops into true cancer.
Dysplasia is a term that refers to a pre-cancerous condition. In the case of cervical cancer, dysplasia indicates that some cells on the outside of the cervix (squamous epithelial cells) are abnormal in size and shape and are beginning to grow. However, the abnormal cells are still confined to the surface (epithelial layer). These abnormal cells may eventually become cancerous, but this does not always happen.
Pap test screening can help identify abnormal cells that may be pre-cancerous, but a biopsy is necessary for confirmation. In a biopsy test result, pre-cancerous cells are classified as cervical intraepithelial neoplasia (CIN).
(For more information on pre-cancer, see the Diagnosis and Screening section of this report.)
The cells of the epithelium rest on a very thin layer called the basement membrane. Invasive cervical cancer occurs when cancer cells in the epithelium cross this membrane and invade the stroma, the underlying supportive tissue of the cervix. The cancer may then move into adjacent tissues, or penetrate into blood or lymphatic vessels.
In early stages, the cancer is confined to the cervix. In later stages, the original cancer may spread to areas surrounding the uterus and cervix or near organs such as the bladder or rectum. As cancer advances, it may spread further (metastasize) to distant sites in the body through the bloodstream or the lymph nodes.
The human papillomavirus (HPV) is the main cause and risk factor of cervical cancer. Nearly all cases of cervical cancer are caused by HPV. In general, doctors assume that a woman with cervical cancer has been infected with HPV.
HPV is a very common sexually transmitted virus. There are many different types of HPV:
At least half of sexually active women and men are infected with HPV at some point in their lives. HPV usually goes away as a result of the body's immune system fighting off infection. Only 10% of women remain infected for more than 5 years, and sometimes HPV does not go away. A chronic, long-term infection with a high-risk type of HPV can cause changes in cervical cells that eventually lead to cancer.
HPV infection is spread primarily by having sex with a partner infected with HPV. It is transmitted through skin-to-skin contact with infected areas of the genitals, anus, or mouth. Using condoms and limiting the number of sexual partners can help reduce the risk of contracting HPV.
Cervical cancer is extremely rare in women younger than age 20. The median age of diagnosis is 49 years. Nearly half of all cervical cancer diagnoses occur in women ages 35 to 54 years. 20% of cervical cancer diagnoses occur in women over 65 years of age, mostly in women who did not receive regular cancer screening during their younger years.
In the United States, Hispanic women are most likely to develop cervical cancer, followed by African American women. African American women have the highest death rate from cervical cancer. White and Asian women have a lower risk for being diagnosed with and dying from cervical cancer.
Some of these differences are probably related to socioeconomic factors. Many studies report that high poverty levels are linked with low screening rates. In addition, lack of health insurance, limited transportation, and language difficulties often hinder a poor woman's access to screening services.
Human papillomavirus (HPV) is the main risk factor for cervical cancer. The most important risk factor for HPV is sexual activity with an infected person. Women most at risk for cervical cancer are those with a history of multiple sexual partners, sexual intercourse at age 17 years or younger, or both. A woman who has never been sexually active has a very low risk for developing cervical cancer.
Sexual activity with multiple partners increases the likelihood of many other sexually transmitted infections (chlamydia, gonorrhea, and syphilis). Studies have found an association between chlamydia and cervical cancer risk; including the possibility that chlamydia may prolong HPV infection.
Women have a higher risk of cervical cancer if they have a first-degree relative (mother, sister) who has had cervical cancer.
Long-term use of oral contraceptives (OCs and birth control pills) may increase the risk for cervical cancer. Women who take birth control pills for more than 5 to 10 years appear to have a higher risk for HPV infection than those who do not use OCs. Women taking OCs for fewer than 5 years do not have a significantly higher risk.
The reasons for this risk from OC use are not entirely clear. Some research suggests that the hormones in OCs might help the virus enter the genetic material of cervical cells. Another possible reason is that women who use OCs may be less likely to use barrier methods, such as condoms. Latex condoms can help reduce, although not eliminate, the risk of HPV transmission and other sexually transmitted infections (STIs).
Having given birth to three or more children may increase the risk for cervical cancer.
Smoking is associated with a higher risk for pre-cancerous changes (dysplasia) in the cervix and for progression to invasive cervical cancer.
Women with weakened immune systems, such as those with HIV/AIDS, or on immunosuppressing drugs, such as prednisone, are more susceptible to acquiring HPV. Immunocompromised people are also at higher risk for having cervical pre-cancer develop rapidly into invasive cancer.
From 1938 to 1971, diethylstilbestrol (DES), an estrogen-related drug, was widely prescribed to pregnant women to help prevent miscarriages. The daughters of these women face a higher risk for of an unusual type of cervical and vaginal cancer called clear cell carcinoma, as well as other gynecological problems. DES is no longer prescribed.
The best ways to prevent cervical cancer are:
Two vaccines are approved by the Food and Drug Administration (FDA) to prevent either HPV or cervical cancer: Gardasil and Cervarix.
Gardasil is approved for:
Because it protects against 4 strains of HPV, Gardasil is called a quadrivalent vaccine.
In late 2014, the FDA approved Gardasil 9, a new version of this vaccine, which protects against 5 additional HPV strains for a total of 9 strains. It may potentially prevent 90% of cervical, vulvar, vaginal, and anal cancers. The vaccine is approved for females ages 9 to 26 and males ages 9 to 15.
Cervarix is approved for:
Because it protects against 2 strains of HPV, Cervarix is called a bivalent vaccine.
Current immunization guidelines recommend:
The HPV vaccine can only prevent, not treat:
Because the vaccine cannot protect females who are already infected with HPV, doctors recommend that girls and boys get vaccinated before they become sexually active.
Studies indicate that the vaccine is nearly 100% effective in preventing cervical cancer and genital warts (caused by the HPV types covered in the vaccine) when given prior to HPV exposure. However, young women who are sexually active may still derive some benefit from the vaccine, at least for protection against any of the four HPV strains that they have not yet acquired.
The most common side effects of the vaccine include:
These vaccines do not protect against all types of cancer-causing HPV. Women should receive regular screening to detect any early signs of cervical cancer. For girls and women who have been sexually active before they receive the vaccine, screening still provides the best protection against cervical cancer.
Condoms provide some protection against HPV as well as other sexually transmitted infections.
Male circumcision may possibly reduce the risk of HPV, but it does not completely prevent it. Men who are circumcised should still use condoms.
Some evidence suggests that the intrauterine device (IUD) may help protect against cervical cancer. The IUD is a type of birth control that is inserted into the uterus by a health professional. It is a small plastic T-shaped device that contains either the hormone progesterone or copper.
Researchers are not certain exactly how the IUD reduces cervical cancer risk, but some think that the process of inserting or removing the device may destroy pre-cancerous lesions. Another possible explanation is that the IUD causes a low-grade infection in the cervix, which interferes with HPV establishing itself in the cervix.
Regular Pap tests are the most effective way to diagnose cervical cancer when it is still in its earliest, most curable stages. In some cases, a HPV test may be used either along with the Pap test or in place of it. [For more information, see Diagnosis and Screening section of this report.]
Prognosis for cervical cancer depends on the:
The earlier that cervical cancer is detected, the better the odds for survival.
47% of cervical cancer cases are diagnosed in the early stages when the cancer is confined to the cervix (localized or Stage I). 36% of cases are diagnosed after the cancer has spread to adjacent areas or lymph nodes (regional or Stage II/III), and 12% of cases are diagnosed when the cancer has already spread to distant regions (metastasized or Stage IV).
A 5-year survival rate refers to the percentage of people who survive cancer 5 years after being diagnosed. Depending on the stage and spread of cancer, 5-year survival rates for cervical cancer are generally:
Most women with dysplasia (pre-cancer) or pre-invasive cancer have no symptoms. This is why screening tests are so important.
Symptoms of invasive cancer may include:
These symptoms are not exclusive to cervical cancer. Sexually transmitted diseases, for instance, can cause similar symptoms.
The changes that lead to cervical cancer develop slowly. Screening tests performed during regular gynecologic examinations can detect early changes. The two tests used for cervical cancer screening are:
The Papanicolaou test, better known as the Pap test or Pap smear, can help detect cervical cancer when it is in its earliest stages. It can also detect pre-cancerous changes in cells.
Use of the Pap test has significantly reduced the death rate from cervical cancer. Most cases of cervical cancer occur in women who have not had regular Pap tests.
Preparing for a Pap Test: Doctors recommend scheduling a Pap test 10 to 20 days after menstruation begins to get the most accuate results. Those are the best days for obtaining the most accurate results. The Pap test should not be performed during menstruation.
In the 24 to 48 hours before the test, DO NOT:
Pap Test Procedure: A Pap test is usually painless, although some women may have mild discomfort:
A Pap test is a simple, relatively inexpensive procedure that can easily detect cancerous or pre-cancerous conditions.
Reliability and Accuracy: The Pap test is not a perfectly reliable measure of a woman's risk for cervical cancer. Sometimes it misses the presence of cancer or pre-cancer cells, which is called a false-negative result. However, if abnormal cells are missed on one test, they are likely to be spotted during the next one, hopefully while they are still in the pre-cancerous state, which makes treatment significantly easier and safer.
It is also possible for a test to indicate abnormal cells when the cells are really normal, a so-called false positive result. If a test indicates possible abnormal cells, your provider will order another Pap test or other tests to confirm the results.
For an HPV DNA test, the provider collects a sample of the cervical cells the same way (and usually at the same time) as the Pap test. This test looks for the types of human papillomavirus (particularly HPV 16 and HPV 18) that cause cervical cancer by analyzing the DNA of the cervical cells.
The HPV test can be used along with the Pap test to screen for cervical cancer in women ages 30 years and older. It is also approved as a single test for women ages 25 and older to see if they need further diagnostic testing with a Pap test or colposcopy. The test can provide information on a women's risk of developing cervical cancer in the future.
General guidelines for cervical cancer screening recommend:
The cells viewed in a cervical smear sample are classified on a scale representing the spectrum of cell changes from normal to cancerous. The Pap test is first characterized as either normal or abnormal.
The Bethesda System (TBS) is used to report Pap test results. It classifies abnormal results as:
Atypical Squamous Cells (ASC): ASCs are mildly abnormal cells on the surface of the cervix. It is difficult to know if they are pre-cancerous. They may be normal cells with changes simply caused by inflammation. ASCs are further categorized as ASC-US or ASC-H:
Squamous Intraepithelial Lesions (SILs): SILs are classified as either low-grade (LGSIL) or high-grade (HGSIL). High-grade SILs are more serious than low-grade SILs, and need to be treated because they can develop into invasive cancer. Pap tests can suggest the presence of SILs but not their grade. Women with SILs discovered through a Pap test should undergo colposcopy. A colposcopy can determine whether SILs are high-grade or low-grade and whether treatment is required.
Atypical Glandular Cells and Adenocarcinoma: Atypical glandular cells pose a higher risk for the presence of cancerous changes than atypical squamous cells. Women with atypical glandular cells need colposcopy, and endocervical and endometrial testing, to rule out the presence of cancer. Adenocarcinoma refers to glandular cells that are cancerous.
The Pap test shows only the presence of abnormal cells. It is useful simply as a screening test that identifies women who may have pre-invasive or early cancerous changes. For a diagnosis, the next step is usually colposcopy, during which the cervix is visualized under low power magnification. The doctor takes small samples of the cervix for biopsies. A biopsy will determine the grade of the pre-cancerous growth or whether invasive cancer is present.
Colposcopy Procedure: Colposcopy can be performed in a medical office without anesthesia in 10 to 15 minutes. It causes about as much discomfort as mild menstrual cramps:
Conization, or cone biopsy, is a more invasive way of doing a biopsy. It is a surgical procedure that uses a scalpel (cold knife biopsy), laser beam, or a wire heated by electrical current (LEEP procedure) to remove a larger piece of the cervix. Conization may be performed as diagnostic procedure, or as a treatment for pre-cancers or early-stage cancers.
The pre-cancerous changes from biopsy results of colposcopy are called cervical intraepithelial neoplasia. They are graded according to severity as CIN I, CIN II, and CIN III:
CIN III is considered the same as carcinoma in situ (CIS) or Stage 0 cervical cancer. In both CIN III and CIS the pre-cancerous cells still rest on the surface of the cervix and have not yet invaded through the basement membrane into the deeper tissues. However, if not surgically removed, there is a high chance that CIN III or CIS can progress to invasive cancer.
Follow-Up Procedures: Women with evidence of cervical intraepithelial neoplasia (CIN) II and III or cervical cancer need treatment. Women with biopsies that show low-grade abnormal cells or CIN I, but whose cervix is otherwise normal, are generally given follow-up Pap tests or colposcopies.
If a biopsy detects invasive cancer, the woman will need additional tests to find out how far the cancer has spread. Tests to stage cancer may include imaging tests such as:
Other special pelvic exam procedures may also be recommended.
After making a diagnosis, a doctor will classify the stage of the cancer according to the size of the primary tumor, and how far cancer has spread into the lining of the cervix, throughout the cervix, or beyond. Doctors use staging to determine treatment and prognosis.
The basic cervical cancer stages are:
Treatment of cervical cancer depends on:
Your cancer care team may include a gynecologist (doctor who specializes in the female reproductive system), gynecological oncologist (a gynecologist who specializes in cancers of the female reproductive organs), a medical oncologist, a radiation oncologist, and other health care providers.
A cancer support group can help ease the stress of illness. Sharing with others who have common experiences and problems can help you not feel alone.
Treatment of cervical intraepithelial neoplasia (CIN), including pre-invasive cancer, depends on the type and extent of abnormal changes. Very early pre-cancer (CIN I) often goes away on its own, but needs follow-up Pap tests and colonoscopy to monitor the condition.
CIN II or CIN III may turn into invasive cancer if the surgical area is not removed or destroyed. This is done using cryocauterization (freezing the cervix), conization with cold knife biopsy, loop electrosurgical excision procedure (LEEP), or laser surgery.
Although not common for pre-invasive cancer, hysterectomy or internal radiation therapy may be recommended for some woman.
Treatment for invasive cervical cancer depends on the stage of the cancer. Clinical trials investigating new treatment approaches are available for all stages of cervical cancer. Treatment approaches include surgery, radiation, and chemotherapy.
Surgery for cervical cancer includes:
Radiation treatments include:
Chemotherapy uses cancer-killing drugs that are injected into a vein or taken by mouth. Chemotherapy may be used:
Some of the treatments used for cervical cancer can make a woman infertile. Women of child-bearing age should discuss with their cancer care team any concerns and questions they may have about how various cancer treatments could affect their fertility. They may also wish to have a consultation with a fertility specialist.
Some women with cervical cancer may be candidates for surgical procedures, such as ovarian transposition that preserves ovarian function or radical trachelectomy that preserves the uterus. Other women may want to consider assisted reproductive technology, such as embryo or oocyte (egg) cryopreservation ("freezing"). It is very important that you have these discussions with your health care team before you begin cancer treatment.
Surgery is the primary treatment for most cases of early-stage cervical cancer.
Conization is a surgical procedure that removes a cone-shaped piece of tissue from the cervix. Conization may be performed using:
LEEP and laser surgery can be performed in a medical office using local anesthesia. Cold knife conization is performed under general anesthesia in an operating room.
Conization does not usually affect a woman's fertility, although in a small percentage of cases it may result in cervical incompetence (inability for the cervix to hold a pregnancy). However, if conization is performed on a woman who is pregnant, it may cause miscarriage or severe bleeding.
A hysterectomy aims to eliminate the cancerous tissue by removing the uterus and cervix.
Depending on the stage of the cervical cancer and how far it has spread, the woman may have either a total (simple) hysterectomy or a radical hysterectomy. In some cases, both fallopian tubes and ovaries may be removed (bilateral salpingo-oophorectomy).
Total Hysterectomy: A total (also called simple) hysterectomy involves the removal of the uterus and the cervix, but leaves the parametrium (ligaments and tissue that surround the uterus) and vagina intact. The uterus may be removed through an open abdominal incision or vaginally.
There are various ways to perform a hysterectomy, including vaginally or laparoscopically. Robotic-assisted hysterectomy is a type of laparoscopic hysterectomy, but the surgical instruments are attached to a robot.
Radical Hysterectomy: A radical hysterectomy removes not only the uterus and the cervix but also the parametrium, the supporting ligaments, and the upper vagina. Pelvic lymph nodes are usually removed at the same time in a procedure called lymphadenectomy. Radical hysterectomy may be performed through open abdominal surgery, or through vaginal, laparoscopic or robotic-assisted laparoscopic, methods.
Total recovery time is generally 2 to 3 weeks for vaginal hysterectomy and 4 to 6 weeks for abdominal hysterectomy. Radical hysterectomy may take several months for full recovery.
Hysterectomy causes infertility. After a hysterectomy, a woman no longer has menstrual periods and she can no longer become pregnant. Women retain their clitoris and can still experience sexual arousal and climax.
Menopause may begin a few years earlier than it naturally would. (Removal of the ovaries causes immediate menopause.) Women who have had a hysterectomy no longer need to have Pap tests because they have had their cervix removed.
For some women, radical trachelectomy may be a fertility-sparing alternative to a hysterectomy. Radical trachelectomy involves removing the cervix, surrounding ligaments and tissue, and upper part of the vagina. The uterus is then reattached to the remaining vagina. The lymph nodes are usually removed as a separate laparoscopic procedure.
Women can usually resume normal activities in about 6 weeks. Radical trachelectomy poses a high risk for miscarriage during future pregnancy, but some women who have this procedure are able to carry a baby to term. The baby is delivered by cesarean section (C-section).
If the tumor recurs or persists within the pelvis after treatment, a more extreme procedure called a pelvic exenteration may be recommended. Pelvic exenteration combines radical hysterectomy (if the uterus is still present) with the removal of the vagina, bladder, rectum, and part of the colon. The extensiveness of the surgery depends on where the cancer has spread.
The surgeon may perform a colostomy to create a new passage for the stool to leave the body, although occasionally the colon can be put back together, and will similarly construct a new urinary drainage system. If the vagina is removed, a plastic surgeon may be able to reconstruct a new one. Full recovery from pelvic exenteration can take 6 months or longer.
Radiation therapy for cervical cancer is usually given along with chemotherapy. The combination treatment is called chemoradiation. Chemoradiation is used as a primary treatment for many stages of cervical cancer. Radiation may also be used as palliative therapy to ease symptoms and improve quality of life in late-stage cancer, and to treat recurrent cancer.
There are two types of radiation therapy:
In order to be effective, radiation therapy must be powerful enough to destroy the cancer cells' ability to grow and divide. This means that normal cells are also affected, which can cause significant side effects. Fortunately, healthy cells usually recover quickly from the damage, whereas abnormal cells do not.
Side Effects: Side effects of radiation therapy may include fatigue, redness or dryness in the treated area, diarrhea, frequent or uncomfortable urination, and vaginal dryness, itching, or burning. After treatment, many side effects usually disappear.
Long-term side effects may include vaginal scarring (stenosis) and dryness, which can cause painful intercourse. Discuss with your health care provider treatment options for this problem. Radiation doctors often prescribe dilators to help stretch the vaginal walls after treatment, which can help minimize some of these issues..
Radiation to the pelvic area may affect the ovaries and result in premature menopause. Ovarian transposition, which involves surgically moving one or both ovaries outside of the treatment field, may be a fertility-sparing option for some women who are undergoing pelvic radiation. This option should be discussed with your cancer care team in advance of radiation therapy.
Chemotherapy uses cell-killing drugs to destroy cancer cells. Chemotherapy is usually used along with radiation (a combination called "chemoradiation") to help increase the effectiveness of radiation therapy. Chemoradiation is a primary treatment for many stages of cervical cancer.
In the most advanced cancer stage in which curative radiation therapy is not feasible, chemotherapy is used palliatively to help relieve symptoms associated with metastatic cancer.
Platinum-Based Drugs: Platinum-based drugs are the main chemotherapy treatment for cervical cancer. Cisplatin is the primary drug used. Carboplatin is an alternative platinum drug for women who cannot tolerate cisplatin. These drugs may be used alone or in combination with paclitaxel.
Other drugs: Other drugs that may be used alone or in combination include paclitaxel, topotecan, gemcitabine, 5-FU, and others.
Bevacizumab (Avastin): is a biologic drug approved to treat persistent, recurrent, or advanced (metastatic) cervical cancer. Bevacizumab blocks a protein that helps blood vessels form. By targeting this protein, the drug slows the growth of cancer cells.
Bevacizumab may be given in combination with paclitaxel and cisplatin, or paclitaxel and topotecan. In clinical trials, this combination of targeted therapy and chemotherapy helped prolong survival about 4 months longer than chemotherapy alone.
Administration: Chemotherapy is usually given intravenously at a medical center or office. The drugs are given in cycles with a period of rest following a period of treatment, to allow recovery from the side effects.
Side Effects: Side effects are common with chemotherapy. They vary depending on the drug, or combinations of drugs, used.
Common side effects may include:
More serious side effects can include:
Many side effects are temporary and go away once treatment is completed. Other side effects may take longer to stop, or may be permanent. Discuss with your cancer care team any side effects you experience. Some side effects can be treated or prevented with drugs or other therapies.
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