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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