You may recall in 2002 when news that the WHI study was stopped due to unexpected increased incidence of heart attacks and stroke, media coverage caused multitudes of women to abandon their hormone therapy cold-turkey. Lots of women did not understand that the risk may not have actually applied to them personally. It is a pretty complicated issue to be covered in a headline. Now new data from the Women’s Health Initiative (WHI) regarding estrogen plus progestin hormone therapy and breast cancer published in Journal of American Medical Association (JAMA) on 10/20/10 (Chlebowski RT, et al) has experts buzzing.
The study: ”Estrogen Plus Progestin and Breast Cancer Incidence and Mortality in Postmenopausal Women“ is a further analysis of the Women’s Health Initiative randomized study of postmenopausal women taking conjugated equine estrogen plus medroxyprogesterone acetate, conjugated equine estrogen alone or placebo (sugar pill). After a follow-up of 11 years, it is found that the women taking estrogen with progestin had increase risk of invasive breast cancer compared with women taking placebo. Even more important was the evidence that women on the combined hormones had a higher risk of dying from the disease. Ok, I know this is scary, but before you trash your hormones…
This is what you need to consider:
- A 2004 report published in JAMA on the estrogen-alone component of the WHI found no increase in breast cancer risk among women with hysterectomy over an average of 7 years of randomized treatment.
- The absolute risk amounts to 2.6 deaths from breast cancer (in the combined hormone group) vs 1.3 deaths (in the placebo group) per 10,000 women per year.
- While the absolute risk of breast cancer death is small, it is increased for women taking combined estrogen plus daily progestin.
- Experts continue to recommend hormone therapy for menopause symptoms only, using the lowest dose for the shortest period of time.
This is what you should do:
- If you have had a hysterectomy and are on estrogen only, don’t sweat it.
- Weigh the risks and benefits. Can you manage your symptoms with life style changes? Exercise, weight, stress and alcohol management can make a huge difference. It takes more committment than taking a pill but the rewards are worthwhile.
- Consider a trial off your hormones every 6-12 months. Things change. Maybe your symptoms have too.
- Lower your dose. Use the lowest effective dose, for the shortest period of time.
- If life is so much better with hormones that you decide to continue, there are other ways you can reduce your risks. To repeat: Exercise, weight, stress and alcohol management can make a huge difference.
Remember that if you have a uterus, taking estrogen alone can cause cancer of the lining of the uterus. Progestins are needed to prevent that from happening. Good for the uterus, bad for the breasts. So researchers continue their quest for answers to the following questions:
- Do the same risks for breast cancer apply for different kinds of progestins such as micronized progesterone?
- Can risk safely be reduced by reducing exposure to progestins by taking them intermittently, like every 3 months instead of daily?
Stay tuned, talk to your health care provider and keep asking your own questions.

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