Cancer that begins in the cells on the outside of the ovaries.
Called epithelial tumors, these cancers begin in the thin layer of tissue that covers the outside of the ovaries. Most ovarian cancers are epithelial tumors.
Cancer that begins in the egg-producing cells.
Called germ cell tumors, these ovarian cancers tend to occur in younger women.
Cancer that begins in the hormone-producing cells.
These cancers, called stromal tumors, begin in the ovarian tissue that produces the hormones estrogen, progesterone and testosterone.
The type of ovarian cancer you have helps determine your prognosis and treatment options.
Certain factors may increase your risk of ovarian cancer. Having one or more of these risk factors doesn’t mean that you’re sure to develop ovarian cancer, but your risk may be higher than that of the average woman. These risk factors include:
Inherited gene mutations.
A small percentage of ovarian cancers are caused by an inherited gene mutation. The genes known to increase the risk of ovarian cancer are called breast cancer gene 1 (BRCA1) and breast cancer gene 2 (BRCA2).
These genes were originally identified in families with multiple cases of breast cancer, which is how they got their names, but these mutations also have a significantly increased risk of ovarian cancer. Another known genetic link involves an inherited syndrome called hereditary nonpolyposis colorectal cancer (HNPCC). People in HNPCC families are at increased risk of cancers of the uterine lining (endometrium), colon, ovary, and stomach.
Family history of ovarian cancer.
If people in your family have been diagnosed with ovarian cancer, you have an increased risk of the disease.
A previous cancer diagnosis.
If you’ve been diagnosed with cancer of the breast, colon, rectum, or uterus, your risk of ovarian cancer is increased.
Your risk of ovarian cancer increases as you age. Ovarian cancer most often develops after menopause, though it can occur at any age.
Never having been pregnant.
People who have never been pregnant have an increased risk of ovarian cancer.