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Arsenic ingestion from well water associated with increased risk of lung cancer

Residents of Taiwan who consumed drinking water with high levels of arsenic have a higher risk of lung cancer, with cigarette smokers from this group having an even greater risk, according to a study in the December 22/29 issue of JAMA.

Arsenic is a naturally occurring element in soil, and can contaminate drinking water, according to background information in the article. Residents of the southwestern and northeastern coasts of Taiwan had been drinking well water contaminated with a high concentration of arsenic before the establishment of the public tap water system.

Chi-Ling Chen, Ph.D., of the College of Public Health, National Taiwan University, Taipei, Taiwan, and colleagues conducted a study to determine the dose-response relationship between ingested arsenic and lung cancer risk and the added effect of cigarette smoking on this risk.

The study included 2,503 residents in southwestern and 8,088 in northeastern arsenic-endemic areas in Taiwan, who were followed up for an average period of 8 years. Information on arsenic exposure, cigarette smoking, and other risk factors was collected at enrollment through standardized questionnaire interview.

During the study followup period, there were 139 newly diagnosed cases of lung cancer. Residents with the highest level of arsenic exposure had a 3.29 times increased risk for lung cancer, after adjusting for various factors including age, sex, and cigarette smoking status at recruitment. Among nonsmokers, those who were exposed to the highest arsenic level had about twice the risk for lung cancer when compared with those with the lowest level of exposure. Among participants with the lowest arsenic level, those who had the highest cumulative cigarette smoking exposure had a 4-fold risk of lung cancer compared with nonsmokers. When compared with nonsmokers with the lowest levels of arsenic exposure, those who consumed well water with the highest arsenic levels and smoked for more th
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Contact: Chien-Jen Chen, Sc.D.
cjchen@ha.mc.ntu.edu.tw
JAMA and Archives Journals
21-Dec-2004


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