Association of Cumulative Lead Exposure with Parkinson’s Disease

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Association of Cumulative Lead Exposure with Parkinson’s Disease

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Title: Association of Cumulative Lead Exposure with Parkinson’s Disease
Author: Nie, Huiling; Saint-Hilaire, Marie-Helene; Hu, Howard; Weisskopf, Marc G.; Weuve, Jennifer Lynn; Simon, David K.; Sudarsky, Lewis Richard; Hersh, Bonnie Patricia; Schwartz, Joel David; Wright, Robert O.

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Citation: Weisskopf, Marc G., Jennifer Weuve, Huiling Nie, Marie-Helene Saint-Hilaire, Lewis Sudarsky, David K. Simon, Bonnie Hersh, Joel Schwartz, Robert O. Wright, and Howard Hu. 2010. Association of Cumulative Lead Exposure with Parkinson's Disease. Environmental Health Perspectives 118(11): 1609-1613.
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Abstract: Background: Research using reconstructed exposure histories has suggested an association between heavy metal exposures, including lead, and Parkinson’s disease (PD), but the only study that used bone lead, a biomarker of cumulative lead exposure, found a nonsignificant increase in risk of PD with increasing bone lead. Objectives: We sought to assess the association between bone lead and PD. Methods: Bone lead concentrations were measured using 109Cd excited K-shell X-ray fluorescence from 330 PD patients (216 men, 114 women) and 308 controls (172 men, 136 women) recruited from four clinics for movement disorders and general-community cohorts. Adjusted odds ratios (ORs) for PD were calculated using logistic regression. Results: The average age of cases and controls at bone lead measurement was 67 (SD = 10) and 69 (SD = 9) years of age, respectively. In primary analyses of cases and controls recruited from the same groups, compared with the lowest quartile of tibia lead, the OR for PD in the highest quartile was 3.21 [95% confidence interval (CI), 1.17–8.83]. Results were similar but slightly weaker in analyses restricted to cases and controls recruited from the movement disorders clinics only (fourth-quartile OR = 2.57; 95% CI, 1.11–5.93) or when we included controls recruited from sites that did not also contribute cases (fourth-quartile OR = 1.91; 95% CI, 1.01–3.60). We found no association with patella bone lead. Conclusions: These findings, using an objective biological marker of cumulative lead exposure among typical PD patients seen in our movement disorders clinics, strengthen the evidence that cumulative exposure to lead increases the risk of PD.
Published Version: doi:10.1289/ehp.1002339
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