Ovarian Cancer Symptoms, Early Warning Signs, and Risk Factors
Cancer of the ovary (ovarian cancer) is the ninth most common cancer in women in the U.S. with almost 22,000 women newly diagnosed each year. Ovarian cancer is the fifth leading cause of cancer deaths in women. It frequently does not result in symptoms until the cancer has spread extensively beyond the ovary.
Ovarian cancer actually represents a group of different tumors that arise from diverse types of tissue contained within the ovary. The most common type of ovarian cancer arises from the epithelial cells (the outside layer of cells) of the surface of the ovary. Other, rare types of ovarian cancer develop from the egg-forming germ cells or from the supporting tissue (stroma) of the organ. Benign (noncancerous) tumors and cysts are also found in the ovary and are much more common than ovarian cancers.
The majority of ovarian cancers are diagnosed late, after the cancers have spread. Only about 20% of women are diagnosed early, when the disease may be most curable. There is no definitive screening test for early ovarian cancer. Regular pelvic examinations, sometimes supplemented by ultrasound examinations or blood tests for cancer-related markers, have been routinely used for ovarian cancer screening, but none of these tests are specifically able to detect ovarian cancer. Traditionally, it was believed that ovarian cancer does not produce any characteristic symptoms until the tumor is widespread, and that early symptoms of ovarian cancer were not recognizable.
However, in June 2007, the American Cancer Society, along with other medical societies including the Gynecologic Cancer Foundation and the Society of Gynecologic Oncologists, released a consensus statement about possible early symptoms of ovarian cancer. This statement was based on research suggesting that some of the early symptoms of ovarian cancer can, in fact, be recognized. In particular, possible early ovarian cancer symptoms include the following:
The researchers note that women who have these problems should see a gynecologist for cancer screening if these problems are new, if the symptoms are severe, and if they have been present continuously for over two to three weeks.
It is important for women to remember that these symptoms do not necessarily mean that a woman has ovarian cancer, as many other common and harmless conditions can produce similar symptoms. Moreover, other causes for these symptoms are far more common than ovarian cancer and, for example, include irritable bowel syndrome and urinary tract infection. Women may also experience some of these symptoms in the premenstrual phase of their monthly cycle.
Doctors do not know exactly what causes ovarian cancer. However, some factors and conditions may increase a woman's risk of developing this condition. The following are risk factors for the development of ovarian cancer: