Abstract
Background
Studying gene–environment interactions may provide insight about mechanisms underpinning the reported association between chromosome 15q24-25.1 variation and lung cancer susceptibility.
Methods
In a nested case–control study comparing 746 lung cancer cases to 1,477 controls, all of whom were non-Hispanic white smokers in the β-Carotene and Retinol Efficacy Trial, we examined whether lung cancer risk is associated with single nucleotide polymorphisms (SNPs) tagging the AGPHD1, CHRNA5, CHRNA3, and CHRNB4 genes and whether such risk is modified by diet and other characteristics. Intake of fruits and vegetables, their botanical groups, and specific nutrients were ascertained generally at baseline by food-frequency questionnaire.
Results
Several sets of SNPs in high linkage disequilibrium were found: one set associated with a 27–34% increase and two sets associated with a 13–19% decrease in risk per minor allele. Associations were most prominent for the set including the non-synonymous SNP rs16969968. The rs16969968-lung cancer association did not differ by intake level of most dietary factors examined, but was stronger for individuals diagnosed at <70 years of age or having a baseline smoking history of <40 cigarette pack-years.
Conclusions
Our data suggests that diet has little influence on the relation between chromosome 15q24-25.1 variation and lung cancer risk.
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Abbreviations
- AGPHD1:
-
Aminoglycoside phosphotransferase domain containing 1
- CARET:
-
β-Carotene and Retinol Efficacy Trial
- CHRNA5:
-
Cholinergic receptor, nicotinic, alpha 5
- CHRNA3:
-
Cholinergic receptor, nicotinic, alpha 3
- CHRNB4:
-
Cholinergic receptor, nicotinic, beta 4
- CI:
-
Confidence interval
- FFQ:
-
Food-frequency questionnaire
- IREB2:
-
Iron-responsive element binding protein 2
- LD:
-
Linkage disequilibrium
- nAChR:
-
Nicotinic acetylcholine receptor
- PFA:
-
Polyunsaturated fatty acid
- PSMA4:
-
Proteasome subunit, alpha type 4
- OR:
-
Odds ratio
- SNP:
-
Single nucleotide polymorphism
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Acknowledgments
We thank the CARET participants, along with the CARET investigators and staff at all participating trial institutions, for their effort and contribution to this research, and also Liberto Julianto and Dema Poppa for providing technical and administrative support. This work is supported by R01 CA111703, U01 CA63673, K05 CA092002, and T32 CA009168 from the National Cancer Institute of the U.S. National Institutes of Health (NIH).
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Sakoda, L.C., Loomis, M.M., Doherty, J.A. et al. Chromosome 15q24-25.1 variants, diet, and lung cancer susceptibility in cigarette smokers. Cancer Causes Control 22, 449–461 (2011). https://doi.org/10.1007/s10552-010-9716-1
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DOI: https://doi.org/10.1007/s10552-010-9716-1