American Journal of Epidemiology Vol. 134, No. 4: 340-347
Copyright © 1991 by The Johns Hopkins University School of Hygiene and Public Health
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Occupational Exposure to Electromagnetic Fields and Breast Cancer in Men
1Department of Epidemiology, University of Washington Seattle, WA
2Fred Hutchinson Cancer Research Center Seattle, WA
3University of Tromsø Tromsø, Norway
4New Jersey Department of Health Trenton, NJ
5Department of Applied Medical Sciences, University of Southern Maine Portland, ME
6Department of Epidemiology and Public Health, Yale University New Haven, CT
7Michigan Cancer Foundation Detroit. MI
8Cancer Epidemiology Unit, California Department of Health Services Emeryville, CA
9State Health Registry of lowa lowa City, IA
10School of public Health, Emory University Atlanta, GA
11New Mexico Tumor Registry Albuquerque, NM
12Epidemiology Program, Cancer Research Center of Hawaii Honolulu, HI
13Northern California Cancer Center Alameda, CA
Reprint requests to David B. Thomas, Program in Epidemiology, MP 474, Fred Hutchinson Cancer Research Center, 1124 Columbia Street, Seattle, WA 98104.
Data from a population-based case-control study of breast cancer in men were used to examine the hypothesis that occupational exposure to electromagnetic fields increases the risk of breast cancer. Incident cases (n = 227) diagnosed between 1983 and 1987 were obtained from 10 population-based cancer registries of the Surveillance, Epidemiology, and End Results program of the National Cancer Institute. Controls (n = 300) were selected by random digit dialing and from Medicare eligibility lists. Exposure status, defined as ever having been employed in a job which has been classified as involving potential exposure to electromagnetic fields, was assigned without knowledge of case/control status. An elevated risk was found for any job with exposure (odds ratio (OR) = 1.8, 95 percent confidence interval (CI) 1.0–3.7), and risk was highest among electricians, telephone linemen, and electric power workers (OR = 6.0, 95 percent CI 1.7–21) and radio and communications workers (OR = 2.9, 95 percent CI 0.8–10). Risk did not vary with duration of exposed employment. The risk was highest among subjects who were first employed in jobs with exposure before the age of 30 years and who were initially exposed at least 30 years prior to diagnosis. These results lend support to the theory that electromagnetic fields may be related to breast cancer in men. The hypothesis warrants evaluation in women.
breast neoplasms; electromagnetic fields; employment; environmental exposure; men
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