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Risk of renal cell carcinoma following exposure to metalworking fluids among autoworkers
  1. Deepika Shrestha1,
  2. Sa Liu2,
  3. S Katharine Hammond2,
  4. Michael P LaValley3,
  5. Daniel E Weiner4,
  6. Ellen A Eisen2,
  7. Katie M Applebaum1
  1. 1Department of Environmental and Occupational Health, George Washington University, Milken Institute School of Public Health, Washington, DC, USA
  2. 2Department of Environmental Health Sciences, University of California Berkeley, Berkeley, California, USA
  3. 3Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts, USA
  4. 4Division of Nephrology, Tufts Medical Center, Boston, Massachusetts, USA
  1. Correspondence to Dr Katie M Applebaum, George Washington University, Milken Institute School of Public Health, Department of Environmental and Occupational Health, 950 New Hampshire Ave. NW Suite 400, Washington DC 20051, 202-994-8043, USA; kapplebaum{at}gwu.edu

Abstract

Objectives Metalworking fluids (MWF), used to cool and lubricate metal in occupational settings, are linked to several cancers but data on kidney cancer are limited. We examine how MWF influence the rate of renal cell carcinoma (RCC) in a large prospective study.

Methods A cohort of Michigan autoworkers consisting of 33 421 individuals was followed from 1985 to 2009. The cohort was linked to the Michigan Cancer Registry to identify new cases of RCC. We analysed RCC in relation to cumulative exposure to each specific type of MWF (straight, soluble and synthetic) and all 3 types pooled into a single MWF variable, with a 15-year lag. Cox proportional hazards regression with splines were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs), controlling for age, gender, race, calendar year, year hired, time since hire, plant and other MWF types.

Results There were 135 incident cases. A linear increase in the log-HR was observed for RCC with increasing cumulative exposure to each MWF type and total MWF exposure. At the mean of total MWF exposure (18.80 mg/m3-year), the estimated HR was 1.11 (95% CI 1.04 to 1.19).

Conclusions Our results provide evidence for a dose-dependent association between MWF exposure and RCC. The influence of components of oil-based and water-based MWF needs further examination.

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