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Breast cancer risks acquired in pregnancy may pass to next 3 generations
Date:9/11/2012

Chemicals or foods that raise estrogen levels during pregnancy may increase cancer risk in daughters, granddaughters, and even great-granddaughters, according to scientists from Virginia Tech and Georgetown University.

Pregnant rats on a diet supplemented with synthetic estrogen or with fat, which increases estrogen levels, produce ensuing generations of daughters that appear to be healthy, but harbor a greater than normal risk for mammary cancer, the researchers report in today's Nature Communications.

Although the findings have not yet been validated in humans, the study shows that environmental damage may be passed from one generation to the next not through genetic mutations, but through "epigenetic" alterations that influence how genomic information is decoded.

The research also raises hope that people who may be especially sensitive to carcinogens can be identified and novel prevention strategies can be employed before cancer strikes.

"We have shown for the first time that altered DNA methylations modulated by specific diet in normal development are heritable and transgenerational," said Yue "Joseph" Wang, the Grant A. Dove Professor of Electrical and Computer Engineering at Virginia Tech Research Center Arlington. "We also identified key methylation alteration sites that may be involved or responsible for increased breast cancer risk, which may serve as novel biomarkers for scientists to develop novel and targeted prevention strategies."

The National Cancer Institute estimates that more than 226,000 women and more than 2,000 men will develop breast cancer in 2012, and nearly 40,000 people will die of the disease.

Two thirds of breast cancers that occur in families have no known genetic cause, according to Leena Hilakivi-Clarke, a professor of oncology at Georgetown Lombardi Comprehensive Cancer Center. The study shows what may be underlying the cancer are not genetic mutations, but inherited
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Contact: John Pastor
jdpastor@vt.edu
540-231-5646
Virginia Tech
Source:Eurekalert

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