Abstract
Background
Lung cancer (LC) is the leading cause of mortality caused by neoplasias worldwide. Although cigarette smoking is the primary cause, not all smokers develop LC. Polymorphic variations in genes associated with carcinogen metabolism, DNA repair, and cell-cycle dysregulation may alter an individual risk of developing LC. A polygenic cancer model was proposed, which considers genetic susceptibility to cancer is a global mechanism and suggests that it might be defined by the contributions of low-risk alleles in several candidate genes. This study focused on the analysis of 15 polymorphisms in 12 low-penetrance genes in a case–control study of a sample of Mexican Mestizo population.
Methods
A case–control study was performed with a total of 572 unrelated individuals, including 190 cases with a primary LC diagnosis and 382 healthy controls. The polymorphic status of the individuals was determined by TaqMan probe and RFLP techniques. The association between LC and genotype score (GS) was assessed by logistic regression.
Results
The results suggests a protective effect of the genotypes Arg/Lys of AhR rs2066853 (odds ratio [OR] 0.55, p = 0.03), Ile/Val of CYP1A1 rs1048943 (OR 0.49, p = 0.009), Tyr/His of EPHX1 rs1051740 (OR 0.53, p = 0.03), and A/A of CCND1 rs603965 (OR 0.44, p = 0.02). Analyses using the GS suggest that average cases have a larger number of risk alleles than controls (Student’s t test −4.85, p = 0.001; OR 1.25, p < 0.001).
Conclusions
Our results suggest significant differences between the GS for the cases and controls, which support the hypothesis underlying the additive and polygenic models for lung cancer risk depending on the polymorphisms in low-penetrance genes.
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Acknowledgments
This study was supported by grant PAPIIT-IN219807 (JR) from the UNAM and postgraduate scholarship CVU 204279 (RP) from the CONACYT. We thank Dr. Jorge Morales Fuentes and Dr. Enrique Guzmán (INER) for the blood samples and for the clinic diagnostics of the patients with cancer. We thank QFB. Miriam Balderas Morales for the recollection of blood samples and Pavel Petrosyan for careful and critical reading of the manuscript.
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None declared.
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Pérez-Morales, R., Méndez-Ramírez, I., Moreno-Macias, H. et al. Genetic Susceptibility to Lung Cancer Based on Candidate Genes in a Sample from the Mexican Mestizo Population: A Case–Control Study. Lung 192, 167–173 (2014). https://doi.org/10.1007/s00408-013-9536-7
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DOI: https://doi.org/10.1007/s00408-013-9536-7