Catherine Metayer1, Ghislaine Scelo2, Alice Y Kang3, Robert B Gunier4, Kyndaron Reinier5, Suzanne Lea6, Jeffrey S Chang7, Steve Selvin3, Janice Kirsch8, Vonda Crouse9, Monique Does10, Patricia Quinlan11, S Katharine Hammond4. 1. University of California, Berkeley, School of Public Health, Division of Epidemiology, Berkeley, CA, USA. Electronic address: cmetayer@berkeley.edu. 2. International Agency for Research on Cancer, Lyon, France. 3. University of California, Berkeley, School of Public Health, Division of Epidemiology, Berkeley, CA, USA. 4. University of California, Berkeley, School of Public Health, Division of Environmental Health Sciences, Berkeley, CA, USA. 5. Cedars-Sinai Medical Center, Heart Institute, Los Angeles, CA, USA. 6. East Carolina University, Brody School of Medicine, Department of Public Health, Greenville, NC, USA. 7. National Institute of Cancer Research, National Health Research Institutes, Tainan, Taiwan. 8. Medical oncologist and hematologist, Berkeley, CA, USA. 9. Valley Children's Hospital, Madera, CA, USA. 10. Division of Research, the Permanente Medical Group, Oakland, CA, USA. 11. University of California, San Francisco, Department of Medicine, San Francisco, CA, USA.
Abstract
PURPOSE: Data on parental occupational exposures and risk of childhood leukemia lack specificity. Using 19 task-based job modules, we examined the relationship between occupational exposure to organic solvents and other compounds and the risk of leukemia in children. METHODS: Latino (48%) and non-Latino (52%) children with acute lymphoblastic leukemia (ALL; n=670), acute myeloid leukemia (AML; n=104), and controls (n=1021) were enrolled in a study in California (2000-2008). Logistic regression models were used to estimate the odds ratios (ORs) and 95% confidence intervals (CIs), adjusted for socio-demographic factors. RESULTS: Among children with non-Latino fathers, none of the exposures evaluated were associated with risks of ALL and AML. In contrast, exposure to any organic solvents in Latino fathers was associated with an increased risk of childhood ALL (OR=1.48; 95% CI: 1.01-2.16); in multivariable analyses, the OR for chlorinated hydrocarbons was 2.28 (95% CI: 0.97-5.37) while the ORs were close to one for aromatic hydrocarbons, glycol ethers, and other hydrocarbon mixtures. We also observed an increased risk of ALL with exposure to combustion exhaust/polycyclic aromatic hydrocarbons (PAHs) (ORs=1.70; 95% CI: 1.16-2.57, and 1.46; 95% CI: 0.94-2.26 with and without adjustment for chlorinated hydrocarbons, respectively). Moderately elevated risks of ALL were seen with exposure to metals, paints, and wood dust, although not statistically significant. An increased risk was reported for asbestos based on small numbers of exposed Latino fathers. No associations were reported between maternal exposures to any exposures and childhood ALL and AML. CONCLUSIONS: Our data support associations between paternal occupational exposures to chlorinated hydrocarbons, combustion exhaust, metals, and possibly asbestos and the risk of ALL in the children of Latino fathers only.
PURPOSE: Data on parental occupational exposures and risk of childhood leukemia lack specificity. Using 19 task-based job modules, we examined the relationship between occupational exposure to organic solvents and other compounds and the risk of leukemia in children. METHODS: Latino (48%) and non-Latino (52%) children with acute lymphoblastic leukemia (ALL; n=670), acute myeloid leukemia (AML; n=104), and controls (n=1021) were enrolled in a study in California (2000-2008). Logistic regression models were used to estimate the odds ratios (ORs) and 95% confidence intervals (CIs), adjusted for socio-demographic factors. RESULTS: Among children with non-Latino fathers, none of the exposures evaluated were associated with risks of ALL and AML. In contrast, exposure to any organic solvents in Latino fathers was associated with an increased risk of childhood ALL (OR=1.48; 95% CI: 1.01-2.16); in multivariable analyses, the OR for chlorinated hydrocarbons was 2.28 (95% CI: 0.97-5.37) while the ORs were close to one for aromatic hydrocarbons, glycol ethers, and other hydrocarbon mixtures. We also observed an increased risk of ALL with exposure to combustion exhaust/polycyclic aromatic hydrocarbons (PAHs) (ORs=1.70; 95% CI: 1.16-2.57, and 1.46; 95% CI: 0.94-2.26 with and without adjustment for chlorinated hydrocarbons, respectively). Moderately elevated risks of ALL were seen with exposure to metals, paints, and wood dust, although not statistically significant. An increased risk was reported for asbestos based on small numbers of exposed Latino fathers. No associations were reported between maternal exposures to any exposures and childhood ALL and AML. CONCLUSIONS: Our data support associations between paternal occupational exposures to chlorinated hydrocarbons, combustion exhaust, metals, and possibly asbestos and the risk of ALL in the children of Latino fathers only.
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