Estrogen Again

The Women's Health Initiative reports that taking estrogen doesn't increase cancer risk for many women. Good news with some important caveats

The results of the Women's Health Initiative (WHI)--the largest, most scientifically rigorous study of older women's medical issues ever conducted--continue to startle researchers, confuse the public and frustrate headline writers. Case in point: last week's report that taking estrogen for seven years does not increase the risk of breast cancer for many women. There is a lot of good news in that finding, as well as some important caveats.

In many ways, the story began four years ago when researchers halted a different part of the WHI--one that looked at the long-term health effects of taking the hormone combination estrogen and progestin...

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