Many women take hormone therapy to cope with menopause symptoms like hot flashes and osteoporosis. Some studies suggest that taking those hormones may raise your chances for ovarian cancer. That may be especially true if you take just the hormone estrogen (without progesterone) for at least 5 years.
In general, it seems that the longer you take any type of hormone therapy, the greater your chance of developing cancer. If you're considering hormone therapy to help with your menopause symptoms, talk to your doctor about benefits and risks.