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Due to the rarity of this disease in men, most epidemiologic studies investigating this relationship have been limited by small sample sizes. Herein, associations of several measures of occupational <jats:styled-content style=\"fixed-case\">MF<\/jats:styled-content> exposure with breast cancer in men were investigated using data from the population\u2010based case\u2013control component of the Canadian National Enhanced Cancer Surveillance System. Lifetime job histories were provided by 115 cases and 570 controls. Average <jats:styled-content style=\"fixed-case\">MF<\/jats:styled-content> exposure of individual jobs was classified into three categories (&lt;0.3, 0.3 to &lt;0.6, or \u22650.6\u00a0<jats:italic>\u03bc<\/jats:italic>T) through expert blinded review of participant's lifetime occupational histories. The impact of highest average and cumulative <jats:styled-content style=\"fixed-case\">MF<\/jats:styled-content> exposure, as well as exposure duration and specific exposure\u2010time windows, on cancer risk was examined using logistic regression. The proportion of cases (25%) with a highest average exposure of \u22650.3\u00a0<jats:italic>\u03bc<\/jats:italic>T was higher than among controls (22%). We found an elevated risk of breast cancer in men who were exposed to \u22650.6\u00a0<jats:italic>\u03bc<\/jats:italic>T (odds ratio [<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>]\u00a0=\u00a01.80, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>\u00a0=\u00a00.82\u20133.95) when compared to those with exposures &lt;0.3\u00a0<jats:italic>\u03bc<\/jats:italic>T. Those exposed to occupational <jats:styled-content style=\"fixed-case\">MF<\/jats:styled-content> fields for at least 30\u00a0years had a nearly threefold increase in risk of breast cancer (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>\u00a0=\u00a02.77, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>\u00a0=\u00a00.98\u20137.82) when compared to those with background levels of exposure. Findings for the other time\u2010related <jats:styled-content style=\"fixed-case\">MF<\/jats:styled-content> variables were inconsistent. Our analysis, in one of the largest case\u2013control studies of breast cancer in men conducted to date, provides limited support for the hypothesis that exposure to <jats:styled-content style=\"fixed-case\">MF<\/jats:styled-content> increases the risk breast cancer in men.<\/jats:p>","DOI":"10.1002\/cam4.581","type":"journal-article","created":{"date-parts":[[2016,1,21]],"date-time":"2016-01-21T05:28:47Z","timestamp":1453354127000},"page":"586-596","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Occupational exposure to magnetic fields and breast cancer among Canadian men"],"prefix":"10.1002","volume":"5","author":[{"given":"Anne","family":"Grundy","sequence":"first","affiliation":[{"name":"Department of Cancer Epidemiology and Prevention Research Alberta Health Services \u2013 Cancer Control Alberta  Calgary Alberta Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2306-7921","authenticated-orcid":false,"given":"Shelley A.","family":"Harris","sequence":"additional","affiliation":[{"name":"Prevention and Cancer Control Cancer Care Ontario  Toronto Ontario Canada"},{"name":"Occupational Cancer Research Center Cancer Care Ontario  Toronto Ontario Canada"},{"name":"Division of Occupational and Environmental Health Dalla Lana School of Public Health University of Toronto  Toronto Ontario Canada"},{"name":"Division of Epidemiology Dalla Lana School of Public Health University of Toronto  Toronto Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul A.","family":"Demers","sequence":"additional","affiliation":[{"name":"Occupational Cancer Research Center Cancer Care Ontario  Toronto Ontario Canada"},{"name":"Division of Occupational and Environmental Health Dalla Lana School of Public Health University of Toronto  Toronto Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenneth C.","family":"Johnson","sequence":"additional","affiliation":[{"name":"Department of Epidemiology and Community Medicine University of Ottawa  Ottawa Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David A.","family":"Agnew","sequence":"additional","affiliation":[{"name":"University of Ontario Institute of Technology  Oshawa Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"name":"Canadian Cancer Registries Epidemiology Research Group","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul J.","family":"Villeneuve","sequence":"additional","affiliation":[{"name":"Department of Health Sciences Carleton University  Ottawa Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2016,1,21]]},"reference":[{"key":"e_1_2_7_2_1","volume-title":"Canadian cancer statistics 2014","author":"Canadian Cancer Society's Advisory Committee on Cancer Statistics","year":"2014"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10549-007-9882-3"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1186\/1477-7819-6-58"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1186\/bcr2930"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10549-008-0053-y"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1158\/1055-9965.20.14.1"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1093\/annonc\/mdt025"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-0-387-87583-5_1"},{"key":"e_1_2_7_10_1","unstructured":"2002.IARC monograph on the evaluation of carcinogenic risk to humans. 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