Tamoxifen Gives Lasting Protection, study finds

December 12, 2014 6:45 PM

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Tamoxifen Gives Lasting Protection, study finds

The long-awaited IBIS-I trial (short for International Breast Cancer Intervention Study-I) found that tamoxifen was even more effective in preventing breast cancer in women who did not take hormone replacement medications. Women who took tamoxifen and did not take concurrent replacement hormones had a 38% decline in breast cancer diagnoses of any genetic variety over roughly 16 years of follow-up. And new diagnoses of estrogen-sensitive breast cancers -- the most common kind -- dropped by 45% among these women.

That means that for every 22 women who took tamoxifen for five years, there would be one fewer diagnosis of estrogen-sensitive breast cancer over a 20-year period. In an editorial published alongside the IBIS study, Rowan T. Chlebowski, a leading breast cancer researcher at Los Angeles BioMedical Re...

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