What is it? Cancer of the cervix (cervical cancer) is caused by the uncontrolled growth of cells in the cervix. The cervix is the narrowed bottom portion of a woman’s uterus. Shaped like a cone, it connects the upper portion of the uterus to the vagina and is the “gateway” of the birth canal.
Cervical cancer begins slowly. The earliest, precancerous changes cause the cells lining the inside or outside of the cervix to appear different from normal cervical cells. These changes, when present in Papanicolaou (Pap) smear, are termed “atypical cells”. Atypical cells are not entirely specific for a precancerous condition, however, and can temporarily appear in response to infections or irritation of the cervix lining. If precancerous, the atypical cells can become more abnormal in appearance over time and are more likely to progress to cancer if left untreated. In Pap smears, these intermediate cellular changes are called low grade and high grade squamous intraepithelial lesion [see
sidebar]. If these cells become cancerous , they are initially limited to the surface lining and mucus-producing glands of the cervix (in situ). Without treatment, the cancer cells can become invasive by growing into the supporting tissues of the cervix and have the potential to spread to other body sites.
About 80-90% of cervical cancers are squamous cell carcinomas, occurring in the flat squamous cells that cover the outside of the cervix. Most other cases are adenocarcinomas, rising from mucus-producing gland cells of the inner endocervix (the opening of the cervix). A few cervical cancers are mixtures of both types.
With early detection, especially of intraepithelial neoplasia and early invasive forms of cancer, cervical cancer is usually easily treatable. Left unchecked, however, it is almost always fatal. Given time, the cervical cancer can spread (metastasize) to rest of the uterus, the bladder, the rectum, and the abdominal wall. Eventually, it reaches the pelvic lymph nodes and metastasizes. Cervical cancer cells can then invade other organs throughout the body.
Invasive cervical cancer was once a very common disease in the United States. Since the introduction of the Papanicolaou (Pap) smear, a screening tool that allows the detection of cancerous and precancerous changes in the cervix, rates of cervical cancer in the U.S. and other industrialized nations have dropped by as much as 70%. In developing nations without screening programs, however, cervical cancer is still a very serious concern. Cervical cancer continues to be the second most common type of cancer in women worldwide (after breast cancer).
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