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Exposure to secondhand cigarette smoke over a lifetime increased breast cancer risk later in life
Date:12/2/2009

PHILADELPHIA Exposure to secondhand smoke for a prolonged period of time and in high quantity may increase the risk of breast cancer, even in women who never smoked cigarettes themselves.

"The question of whether exposure to side-stream smoke could increase risk of breast cancer is one that is unresolved," said Peggy Reynolds, Ph.D., senior research scientist at the Northern California Cancer Center's Berkeley office. "While no single epidemiologic study can answer the question, our findings suggest that cumulative high levels of exposure may contribute to breast cancer, adding to the evidence for a variety of other adverse health outcomes."

Details of these results are published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research. The December issue features a special focus on tobacco studies.

Reynolds and colleagues examined the risk of developing breast cancer among women who had never smoked tobacco products, but who had a history of exposure to secondhand smoke either at home, at work or in social settings. Participants also had no history of breast cancer.

The researchers collected detailed information via questionnaire from more than 57,000 women in the California Teachers Study, then followed them for a decade. Detailed questions helped the researchers to determine whether age at exposure, setting of exposure or amount of exposure influenced the risk of developing breast cancer.

In the years since completing the questionnaire, 1,754 newly diagnosed cases of invasive breast cancer occurred.

Overall, findings showed no evidence that simple measures of secondhand smoke were associated with breast cancer risk. Risk seemed to be confined to exposures experienced during adulthood (among women aged 20 or older) and primarily among those who were postmenopausal; early-life exposures (before the age of 20) did not alone appear to increase
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Contact: Tara Yates
tara.yates@aacr.org
267-646-0558
American Association for Cancer Research
Source:Eurekalert  

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