BACKGROUND: Exposure to metalworking fluids has been previously associated with prostate cancer mortality in a cohort of autoworkers. Our objective was to further explore this finding in a study of prostate cancer incidence in the same cohort, with reduced misclassification of outcome. METHODS: We conducted a nested case-control study in the General Motors cohort of autoworkers. Incident cases of prostate cancer (n = 872) were identified via the Michigan Cancer Registry from 1985 through 2000. Controls were selected using incidence-density sampling with 5:1 ratio. Using cumulative exposure (mg/m-years) as the dose metric, we first examined varying lengths of lags (0-25 years). Then, we evaluated consecutive windows of exposure: 25 or more years before risk age, and fewer than 25 years. We used penalized splines to model the relative risk as a smooth function of exposure, and adjusted for race and calendar year of diagnosis in a Cox model. RESULTS: Risk of prostate cancer increased with exposure to soluble and straight fluids 25 years or more before risk age but not with exposure in the last 25 years. The relationship with soluble fluids was piecewise linear, with a small increase in risk at lower exposures followed by a steeper rise. By contrast, the relationship with straight fluids was linear, with a relative risk of 1.12 per 10mg/m-years of exposure (95% confidence interval = 1.04-1.20). CONCLUSIONS: Exposure to oil-based fluids, soluble and straight, is modestly associated with prostate cancer risk among autoworkers, with a latency period of at least 25 years.
BACKGROUND: Exposure to metalworking fluids has been previously associated with prostate cancer mortality in a cohort of autoworkers. Our objective was to further explore this finding in a study of prostate cancer incidence in the same cohort, with reduced misclassification of outcome. METHODS: We conducted a nested case-control study in the General Motors cohort of autoworkers. Incident cases of prostate cancer (n = 872) were identified via the Michigan Cancer Registry from 1985 through 2000. Controls were selected using incidence-density sampling with 5:1 ratio. Using cumulative exposure (mg/m-years) as the dose metric, we first examined varying lengths of lags (0-25 years). Then, we evaluated consecutive windows of exposure: 25 or more years before risk age, and fewer than 25 years. We used penalized splines to model the relative risk as a smooth function of exposure, and adjusted for race and calendar year of diagnosis in a Cox model. RESULTS: Risk of prostate cancer increased with exposure to soluble and straight fluids 25 years or more before risk age but not with exposure in the last 25 years. The relationship with soluble fluids was piecewise linear, with a small increase in risk at lower exposures followed by a steeper rise. By contrast, the relationship with straight fluids was linear, with a relative risk of 1.12 per 10mg/m-years of exposure (95% confidence interval = 1.04-1.20). CONCLUSIONS: Exposure to oil-based fluids, soluble and straight, is modestly associated with prostate cancer risk among autoworkers, with a latency period of at least 25 years.
Authors: Eva Andersson; Håkan Westberg; Ing-Liss Bryngelsson; Anders Magnuson; Bodil Persson Journal: Int Arch Occup Environ Health Date: 2012-05-29 Impact factor: 3.015
Authors: Ilir Agalliu; Sadie Costello; Katie M Applebaum; Roberta M Ray; George Astrakianakis; Dao Li Gao; David B Thomas; Harvey Checkoway; Ellen A Eisen Journal: Cancer Causes Control Date: 2011-07-06 Impact factor: 2.506
Authors: Deepika Shrestha; Sa Liu; S Katharine Hammond; Michael P LaValley; Daniel E Weiner; Ellen A Eisen; Katie M Applebaum Journal: Occup Environ Med Date: 2016-08-02 Impact factor: 4.402
Authors: Dominika M Wiktor-Brown; Hyuk-Sang Kwon; Yoon Sung Nam; Peter T C So; Bevin P Engelward Journal: Proc Natl Acad Sci U S A Date: 2008-07-22 Impact factor: 11.205