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American Journal of Epidemiology Advance Access originally published online on May 4, 2009
American Journal of Epidemiology 2009 169(12):1471-1478; doi:10.1093/aje/kwp073
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American Journal of Epidemiology © The Author 2009. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

ORIGINAL CONTRIBUTIONS

Quantitative Exposure to Metalworking Fluids and Bladder Cancer Incidence in a Cohort of Autoworkers

Melissa C. Friesen, Sadie Costello and Ellen A. Eisen

Correspondence to Dr. Ellen A. Eisen, Environmental Health Sciences Division, School of Public Health, University of California, 50 University Hall, #7360, Berkeley, CA 94720-7360 (e-mail: eeisen{at}berkeley.edu).

Received for publication January 18, 2009. Accepted for publication March 10, 2009.

Occupations with mineral oil exposure have been associated with bladder cancer in population-based case-control studies. The authors report results from the first cohort study to examine bladder cancer incidence in relation to quantitative exposures to metalworking fluids (MWFs), based on 21,999 male Michigan automotive workers, followed from 1985 through 2004. Cox regression was used to estimate hazard ratios based on categorical exposure variables for straight, soluble, and synthetic MWFs, as well as duration of exposure to ethanolamines and nitrosamines. Penalized splines were also fit to estimate the functional form of the exposure-response relation. Increased bladder cancer risk was associated with straight MWFs but not with any other exposure. The hazard ratio increased with cumulative exposure to a maximum of 2-fold observed at 75 mg/m3-year straight MWF exposure (lagged 20 years). Calendar time windows relevant to polycyclic aromatic hydrocarbon exposure were examined but could not be distinguished from the lagged (10-, 20-year) metrics. No association was observed between any exposure and incident lung cancer, suggesting that smoking is unlikely to confound the associations observed here. The quantitative relation with straight MWFs strengthens the evidence for mineral oils as a bladder carcinogen.

cohort studies; Cox model; ethanolamines; lung neoplasms; mineral oil; nitrosamines; polycyclic hydrocarbons, aromatic; urinary bladder neoplasms

Abbreviations: CI, confidence interval; MWF, metalworking fluid; PAH, polycyclic aromatic hydrocarbon


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