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Link Between Hormone Replacement Therapy and Breast Cancer Risk

by Sheela Philomena on December 22, 2011 at 2:05 PM
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 Link Between Hormone Replacement Therapy and Breast Cancer Risk

Hormone replacement therapy increases risk of breast cancer, say researchers.

This study comes at a time when more women are again asking for this medication to control hot flashes and other symptoms of menopause.

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The rising trend is at odds with a U.S. Women's Health Initiative (WHI) study of 2002, which found a higher incidence of breast cancer, heart attack and stroke among women using HRT.

Those findings led to a rapid decline in HRT use - and a subsequent reduction in the incidence of breast cancer in many countries. However, HRT is now being offered to women in smaller doses and for a shorter period of time.
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In their study, the McMaster University researchers found "convincing evidence" for a direct association between decreased HRT use after the WHI study and the declining incidence of breast cancer.

"The evidence is compelling that HRT use increases the risk of breast cancer, and its cessation reduces this risk," the researchers said.

"In our study we examined all studies that have reported breast cancer and rates of HRT use after the WHI study. There is very clear evidence that the countries with the highest HRT rates had the largest decrease in breast cancer incidence when HRT use started to decline," said Dr. Kevin Zbuk, assistant professor of oncology at the Michael G. DeGroote School of Medicine at McMaster and lead author on the study.

"Given the potential harms associated with HRT use, physicians and patients alike should be reminded of the lessons learned from the WHI trial. If HRT is needed, it should be used for the shortest time and at the lowest dose necessary to relieve symptoms," he noted.

Their finding appears in the January 2012 issue of the Journal of Epidemiology and Community Health.

Source: ANI
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