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BPA exposure in utero may increase predisposition to breast cancer
Date:10/3/2011

Chevy Chase, MDA recent study accepted for publication in Molecular Endocrinology, a journal of The Endocrine Society, found that perinatal exposure to environmentally relevant doses of bisphenol A (BPA) alters long-term hormone response and breast development in mice that may increase the propensity to develop cancer.

BPA, a man-made chemical produced and marketed largely for specific industrial purposes, is detected in body fluids of more than 90 percent of the human population. It was originally synthesized as an estrogenic compound and there has been concern that exposure to BPA could have developmental effects on various hormone-responsive organs including the mammary gland.

"I want it to be clear that we do not provide evidence that BPA exposure causes breast cancer per se," said Cathrin Brisken, MD, of the Swiss Institute for Experimental Cancer Research and co-author of the study. "We do provide evidence that BPA exposure alters mammary gland development and that this may increase the predisposition of the breast to breast cancer."

In this study, researchers mimicked human exposure to BPA as it occurs with beverages and food from BPA containing vessels (such as plastics and the lining of tin cans) by adding the compound to the drinking water of breeding mice. Female pups born from BPA-consuming parents were transferred to a BPA-free environment at weaning and followed over time.

Researchers analyzed changes in the mammary gland of female offspring that were exposed to BPA through their mothers in utero and while being breast fed. The mammary glands of BPA exposed females showed an increased response to the hormone progesterone. Lifetime exposure to progesterone has been linked to increase breast cancer risk.

Furthermore, researchers found that adult females who had been exposed to BPA in utero and while breast fed, showed a 1.5 fold increase in cell numbers in their milk ducts. This is comparable to what
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Contact: Aaron Lohr
alohr@endo-society.org
240-482-1380
The Endocrine Society
Source:Eurekalert

Page: 1 2

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