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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Occup+Environ+Med 2015 ; 72 (9): 633-9 Nephropedia Template TP
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Occupational Exposures and Lung Cancer Risk among Minnesota Taconite Mining Workers #MMPMID25977445
Allen EM; Alexander BH; MacLehose RF; Nelson HH; Ryan AD; Ramachandran G; Mandel JH
Occup Environ Med 2015[Sep]; 72 (9): 633-9 PMID25977445show ga
Objective: To examine the association between employment duration, elongate mineral particle (EMP) exposure, and silica exposure and the risk of lung cancer in the taconite mining industry. Methods: We conducted a nested case control study of lung cancer within a cohort of Minnesota taconite iron mining workers employed by any of the mining companies in operation in 1983. Lung cancer cases were identified by vital records and cancer registry data through 2010. Two age-matched controls were selected from risk sets of cohort members alive and lung cancer free at the time of case diagnosis. Calendar time-specific exposure estimates were made for every job and were used to estimate workers? cumulative exposures. Odds ratios (OR) and 95% confidence intervals (CI) were estimated using conditional logistic regression. We evaluated total lung cancer risk and risk of histological subtype by total work duration and by cumulative EMP and silica exposure by quartile of the exposure distribution. Results: A total of 1,706 cases and 3,381 controls were included in the analysis. After adjusting for work in hematite mining, asbestos exposure, and sex, the OR for total duration of employment was 0.99 (95% CI: 0.96?1.01). The ORs for quartile 4 versus 1 of EMP and silica exposure were 0.82 (95% CI: 0.57?1.19) and 0.97 (95% CI: 0.70?1.35) respectively. The risk of each histological subtype of lung cancer did not change with increasing exposure. Conclusions: This study suggests that the estimated taconite mining exposures do not increase the risk for the development of lung cancer.