Navigation Links
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 their risk.

Women exposed to moderate to high levels for a combination of years and intensity of exposure had a significant dose response so that the risks for developing breast cancer increased as the cumulative exposure levels increased, according to Reynolds.

"We were initially surprised not to see much effect individually for exposure in household, workplace or social settings," she said. "It does make sense though, if there is an effect for higher levels of exposure, the sum of exposures across settings would be more important than only partial measures of exposure."

Based on these findings, Reynolds suggested that more research is needed to better assess overall exposure patterns. From a public health point of view, these results provide additional evidence for health risks from exposure to secondhand smoke.


'/>"/>

Contact: Tara Yates
tara.yates@aacr.org
267-646-0558
American Association for Cancer Research
Source:Eurekalert  

Related biology news :

1. Exposure to both traffic, indoor pollutants puts some kids at higher risk for asthma later
2. Exposure to lead, tobacco smoke raises risk of ADHD
3. Exposure to alkaline substances can result in damaged teeth
4. Pitt research suggests EPA pesticide exposure test too short, overlooks long term effects
5. Bisphenol A exposure in pregnant mice permanently changes DNA of offspring
6. Environmental exposures may damage DNA in as few as three days
7. Agent Orange exposure increases veterans risk of aggressive recurrence of prostate cancer
8. Lab study shows THC exposure as adolescents linked to negative effects of THC as adults
9. Prenatal meth exposure linked to abnormal brain development
10. Exposure to insecticide may play role in obesity epidemic among some women
11. How increased UV exposure impacts plants
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Exposure to secondhand cigarette smoke over a lifetime increased  breast cancer risk later in life
(Date:4/28/2016)... -- First quarter 2016:   , Revenues ... first quarter of 2015 The gross margin was 49% ... and the operating margin was 40% (-13) Earnings per ... from operations was SEK 249.9 M (21.2) , Outlook ... 7,000-8,500 M. The operating margin for 2016 is estimated ...
(Date:4/26/2016)... , April 27, 2016 ... "Global Multi-modal Biometrics Market 2016-2020"  report to their ... , The analysts forecast the global ... of 15.49% during the period 2016-2020.  ... of sectors such as the healthcare, BFSI, transportation, ...
(Date:4/15/2016)...  A new partnership announced today will help ... in a fraction of the time it takes ... life insurance policies to consumers without requiring inconvenient ... Diagnostics, rapid testing (A1C, Cotinine and HIV) and ... weight, pulse, BMI, and activity data) available at ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... ... April 28, 2016 , ... Morris Midwest ( http://www.morrismidwest.com ), ... manufacturers at its Maple Grove, Minnesota technical center, May 11-12. The event ... Almost 20 leading suppliers of tooling, accessories, software and other related technology ...
(Date:4/27/2016)... York, NY (PRWEB) , ... April 27, 2016 ... ... realizing it. Touch screen mobile devices with fingerprint recognition for secure access, ... libraries are only a few ways consumers are interacting with biometrics technology today. ...
(Date:4/27/2016)... ... April 27, 2016 , ... NDA ... joined the company as an Expert Consultant. Mr. Clark was formerly a ... managing the development of small molecule monographs based on analytical methods. NDA ...
(Date:4/27/2016)... ... April 27, 2016 , ... Global Stem Cells Group ... Asia-Pacific Symposium as other research and development initiatives for potential stem cell protocol management ... Global Stem Cells Group executives began meeting to establish a working agenda and foster ...
Breaking Biology Technology: