Posted on July 17th, 2009 by
Women who use postmenopausal hormones have an increased risk of developing ovarian cancer, according to a study conducted in Denmark. These results were published in the Journal of the American Medical Association.
Estrogen, with or without progestin, is an effective treatment for many menopausal symptoms. During the last several years, however, studies have raised concerns about the health effects of postmenopausal hormone therapy.
Use of estrogen plus progestin has been linked with an increased risk of heart disease, breast cancer, stroke, and blood clots and a decreased risk of fractures and colorectal cancer. Use of estrogen alone, which is generally reserved for women who have had a hysterectomy, has been linked with an increased risk of strokes and a decreased risk of fractures.
Studies have also suggested a possible increase in ovarian cancer among women who use postmenopausal estrogen. To further evaluate the potential link between ovarian cancer and postmenopausal hormones, researchers in Denmark conducted a study among more than 900,000 women between the ages of 50 and 79.
During an average of eight years of follow-up, there were 3,068 diagnoses of ovarian cancer, 2,681 of which involved epithelial ovarian cancer (the most common type of ovarian cancer).
These results provide additional evidence that use of postmenopausal hormones increases the risk of ovarian cancer.
 Rossouw JE, Anderson GL, Prentice RL et al. Risks and benefits of estrogen plus progestin in healthy postmenopausal women: principal results from the Women’s Health Initiative randomized controlled trial. Journal of the American Medical Association. 2002; 288:321-33.
 Anderson GL, Limacher M, Assaf AR et al. Effects of conjugated equine estrogen in postmenopausal women with hysterectomy: the Women’s Health Initiative randomized controlled trial. Journal of the American Medical Association. 2004; 291:1701-1712.
 Million Women Study Collaborators. Ovarian cancer and hormone replacement therapy in the Million Women Study. The Lancet. 2007;369:1703-10.
 Steinrud Mørch L, Løkkegaard E, Halm Andreasen A, Krüger-Kjær S, Kidegaard Ø. Hormone therapy and ovarian cancer. Journal of the American Medical Association. 2009;302: 298-305.
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