Is there a link between ovarian cancer and hormone replacement therapy?

No: Causes of ovarian cancer are poorly understood. In some cases, there is a hereditary risk. There is no evidence that hormone therapy affects ovarian cancer. There is evidence that use of birth control pills is protective against ovarian cancer.

Possibly slight: The risk of ovarian cancer is quite low. Some studies have shown a possible small increased risk. In most instances the risk is not considered great enough to eliminate hormone replacement therapy as a viable option for women who are in need.