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Cancer Causes Control. 2009 Aug;20(6):945-55. doi: 10.1007/s10552-009-9311-5. Epub 2009 Feb 18.

Maternal occupational exposure to extremely low frequency magnetic fields and the risk of brain cancer in the offspring.

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  • 1Department of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, 1110 Pine Avenue West, Montreal, QC H3A 1A3, Canada.

Abstract

OBJECTIVES:

To examine the contribution of maternal occupational exposure to extremely low frequency magnetic fields (ELF-MF) shortly before and during pregnancy on the incidence of childhood brain tumors.

METHODS:

A total of 548 incident cases and 760 healthy controls recruited between 1980 and 2002 from two Canadian provinces (Qu├ębec and Ontario) were included in this study, and their mothers were interviewed. Quantitative occupational ELF-MF exposure in microTesla units was estimated using individual exposure estimations or a job exposure matrix. We used three metrics to analyze exposure: cumulative, average, and maximum level attained.

RESULTS:

Using the average exposure metric measured before conception, an increased risk was observed for astroglial tumors (OR = 1.5, 95% CI = 1.0-2.4). During the entire pregnancy period, a significantly increased risk was observed for astroglial tumors as well as for all childhood brain tumors with the average metric (OR = 1.6, 95% CI = 1.1-2.5 and OR = 1.5, 95% CI = 1.1-2.2, respectively). Based on job titles, a twofold risk increase was observed for astroglial tumors (OR = 2.3, 95% CI = 0.8-6.3) and for all childhood brain tumors (OR = 2.3, 95% CI = 1.0-5.4) among sewing machine operators.

CONCLUSIONS:

Results are suggestive of a possible association between maternal occupational ELF-MF exposure and certain brain tumors in their offspring.

PMID:
19224378
[PubMed - indexed for MEDLINE]
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