Heart and Cancer Risks Drop For Some in an Estrogen Study – Web Log – NYTimes.com

A major caveat in interpreting the new estrogen data is that the study used conjugated equine estrogens, which are estrogen compounds derived from the urine of pregnant mares and marketed by Wyeth Pharmaceuticals under the brand Premarin. The brand has fallen out of favor with many women who are choosing treatments that contain estradiol, which is chemically similar to a woman’s natural estrogen. It is not known whether the benefits of estrogen shown in the Women’s Health Initiative would be replicated using a different type of estrogen.

…a combination of two hormones, estrogen and progestin, which are prescribed to relieve hot flashes and other symptoms of menopause, and have been shown to increase a woman’s risk of breast cancer.
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