In a study by Danish researchers, it was found that menopausal women who took hormone replacement therapy increased their risk of ovarian cancer by 38%. The study of more than 900,000 Danish women, aged 50 to 79, found about one extra ovarian cancer for roughly 8,300 women taking hormone therapy each year. At the time the women got sick, 9% of them were taking hormone therapy, 22% were previous users and 63% did not take it. The researchers calculated that current hormone use conferred a 38% higher risk of contracting the disease compared to non-users over the eight-year study.
Hormone therapy was linked to 140 extra cases of ovarian cancer in Denmark during the eight-year study, accounting for 5% of all cases in that period, the researchers reported in the Journal of the American Medical Association. Dr. Lina Steinrud Morch and colleagues at Copenhagen University wrote in the report:
Even though this share seems low, ovarian cancer remains highly fatal, so accordingly this risk warrants consideration when deciding whether to use (hormone therapy).
The findings were similar to those in the 2002 Women’s Health Initiative study, which was stopped early because it found an increased risk of ovarian cancer, breast cancer, strokes and other health problems from hormone therapy or HRT. After the WHI study HRT use plunged. Sales of U.S. market leader Wyeth’s combined estrogen-progestin therapy Prempro have fallen by 50% since 2001 to around $1 billion a year.
The risks of ovarian cancer were about the same from hormone therapy regardless of the duration of use, the formulation of the hormones, the estrogen dose, or how it was administered, according to the study. As in earlier studies, it found the cancer risk diminished about two years after therapy was stopped. Since ovarian cancer is difficult to detect before it spreads, it’s often fatal. Roughly 18 out of 100,000 U.S. women are diagnosed yearly with the disease, which killed 15,000 Americans in 2007, according to government statistics. Medical research has not found what causes cancer cells to appear in the ovaries in the first place, but estrogen is believed to spur tumor growth and it certainly may be a trigger.
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