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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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Acknowledgments

We thank the study staff, Kuldip Bagga, Agnes Bauzon, Betty Hall, Lina Hsu, Pat Ostrow, Lynne Tse and Anthony Tung, the statistical support of Tim Lee, Karey Shumansky and Zenaida Abanto, the blood processing provided by Pat Lee, and the support of the members of the BC Cancer Agency Lymphoma Tumour Group, including Brian R. Berry. We also thank Nigel T. Brockton for his comments and revisions. Finally, we thank all the participants of the study for making this research possible. Financial Support: The Canadian Cancer Society and the Canadian Institutes of Health Research. Carmen H. Ng was supported by the Michael Smith Foundation for Health Research.

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Correspondence to John J. Spinelli.

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Ng, C.H., Janoo-Gilani, R., Sipahimalani, P. et al. Interaction between organochlorines and the AHR gene, and risk of non-Hodgkin lymphoma. Cancer Causes Control 21, 11–22 (2010). https://doi.org/10.1007/s10552-009-9429-5

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