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Interaction between Organochlorines and the AHR Gene, and Risk of Non-Hodgkin Lymphoma

Carmen H. Ng, Rozmin Janoo-Gilani, Payal Sipahimalani, Richard P. Gallagher, Randy D. Gascoyne, Joseph M. Connors, Jean-Philippe Weber, Agnes S. Lai, Stephen Leach, Nhu D. Le, Angela R. Brooks-Wilson and John J. Spinelli
Cancer Causes & Control
Vol. 21, No. 1 (Jan., 2010), pp. 11-22
Published by: Springer
Stable URL: http://www.jstor.org/stable/25621323
Page Count: 12
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Interaction between Organochlorines and the AHR Gene, and Risk of Non-Hodgkin Lymphoma
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Abstract

Background Plasma organochlorines have been implicated to increase the risk of non-Hodgkin lymphoma (NHL), and interaction with the aryl hydrocarbon receptor gene (AHR) may modify this risk. Methods In this case—control study conducted in British Columbia, Canada, five single nucleotide polymorphisms (SNPs) of AHR were genotyped in 422 NHL cases and 459 controls to measure the association between individual SNPs, haplotypes, and risk of NHL. Pre-chemotherapy organochlorine levels were measured and gene—environment interaction analysis was performed. Results The IVS1 + 4640G/A SNP was significantly associated with NHL risk, with an odds ratio of 1.32 (95% CI = 1.05-1.65) for G/A or A/A genotypes compared to the G/G genotype. Interactions were observed with PCB 118, a known inducer of AHR, and chlordane-related analytes oxychlordane and trans-nonachlor, although no interactions were statistically significant after controlling for multiple comparisons. The observed interactions were consistent across NHL subtypes. Conclusion Results suggest that the AHR gene may play a role in determining the risk of NHL with exposure to organochlorines, and highlight the importance of understanding gene-environment interactions.

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