The ovaries are female reproductive organs located in the pelvis. There are two of them, one on each side of the uterus. The ovaries produce eggs and the female hormones estrogen and progesterone.
Ovarian cancer is a disease in which malignant cells are found in an ovary.
However, epithelial ovarian cancer accounts for 85 to 90 percent of ovarian cancer cases. The cause of ovarian cancer is not yet known. A risk factor is anything that may increase a person's chance of developing a disease. It may be an activity, such as smoking, diet, family history, or many other things. Different diseases, including cancers, have different risk factors.