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Air pollution from traffic and cancer incidence: a Danish cohort study
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Air pollution from traffic and cancer incidence: a Danish cohort study
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Journal Article
Air pollution from traffic and cancer incidence: a Danish cohort study
2011
Overview
Background
Vehicle engine exhaust includes ultrafine particles with a large surface area and containing absorbed polycyclic aromatic hydrocarbons, transition metals and other substances. Ultrafine particles and soluble chemicals can be transported from the airways to other organs, such as the liver, kidneys, and brain. Our aim was to investigate whether air pollution from traffic is associated with risk for other cancers than lung cancer.
Methods
We followed up 54,304 participants in the Danish Diet Cancer and Health cohort for 20 selected cancers in the Danish Cancer Registry, from enrolment in 1993-1997 until 2006, and traced their residential addresses from 1971 onwards in the Central Population Registry. We used modeled concentration of nitrogen oxides (NO
x
) and amount of traffic at the residence as indicators of traffic-related air pollution and used Cox models to estimate incidence rate ratios (IRRs) after adjustment for potential confounders.
Results
NO
x
at the residence was significantly associated with risks for cervical cancer (IRR, 2.45; 95% confidence interval [CI], 1.01;5.93, per 100 μg/m
3
NO
x
) and brain cancer (IRR, 2.28; 95% CI, 1.25;4.19, per 100 μg/m
3
NO
x
).
Conclusions
This hypothesis-generating study indicates that traffic-related air pollution might increase the risks for cervical and brain cancer, which should be tested in future studies.
Publisher
BioMed Central,BioMed Central Ltd,BMC
