Abstract
BackgroundBoth genetic polymorphisms and environmental risk factors play important roles in the development of human chronic diseases including lung cancer. This is the first case-control study of interaction between polymorphisms in pre-miRNA genes and cooking oil fume exposure on the risk of lung cancer.MethodsA hospital-based case-control study of 258 cases and 310 controls was conducted. Six polymorphisms in miRNAs were determined by Taqman allelic discrimination method. The gene-environment interactions were assessed on both additive and multiplicative scale. The statistical analyses were performed mostly with SPSS.ResultsThe combination of the risk genotypes of five miRNA SNPs (miR-146a rs2910164, miR-196a2 rs11614913, miR-608 rs4919510, miR-27a rs895819 and miR-423 rs6505162) with risk factor (cooking oil fume exposure) contributed to a significantly higher risk of lung cancer, and the corresponding ORs (95% confidence intervals) were 1.91(1.04-3.52), 1.94 (1.16-3.25), 2.06 (1.22-3.49), 1.76 (1.03-2.98) and 2.13 (1.29-3.51). The individuals with both risk genotypes of miRNA SNPs and exposure to risk factor (cooking oil fumes) were in a higher risk of lung cancer than persons with only one of the two risk factors (ORs were 1.91, 1.05 and 1.41 for miR-146a rs2910164, ORs were 1.94, 1.23 and 1.34 for miR-196a2 rs11614913, ORs were 2.06, 1.41 and 1.68 for miR-608 rs4919510, ORs were 1.76, 0.82 and 1.07 for miR-27a rs895819, and ORs were 2.13, 1.15 and 1.02 for miR-423 rs6505162, respectively). All the measures of biological interaction indicate that there were not indeed biological interactions between the six SNPs of miRNAs and exposure to cooking oil fumes on an additive scale. Logistic models suggested that the gene-environment interactions were not statistically significant on a multiplicative scale.ConclusionsThe interactions between miRNA SNPs and cooking oil fume exposure suggested by ORs of different combination were not statistically significant.
Highlights
Both genetic polymorphisms and environmental risk factors play important roles in the development of human chronic diseases including lung cancer
The interactions between miRNA Single nucleotide polymorphisms (SNPs) and cooking oil fume exposure suggested by odds ratios (OR) of different combination were not statistically significant
Cigarette smoking cannot fully explain the epidemiologic characteristics of lung cancer in Chinese women, so it’s really significant to explore other important risk factors for lung cancer in Chinese non-smoking females in order to control the effect of cigarette smoke
Summary
A hospital-based case-control study of 258 cases and 310 controls was conducted. Six polymorphisms in miRNAs were determined by Taqman allelic discrimination method. The gene-environment interactions were assessed on both additive and multiplicative scale. The statistical analyses were performed mostly with SPSS. The study was approved by the Institutional Review Board of China Medical University, Shenyang, China. This is an ongoing molecular epidemiologic study of lung cancer in Shenyang City, located in northeast China. Each subject was interviewed to collect demographic data and environmental factors, as well as 5ml venous blood to detect SNP. Environmental factors include passive smoking, cooking oil fume exposure, fuel smoke exposure, family history of cancer, occupational exposure and dietary habit, which were obtained for each case and control by trained interviewers. Individual with a total of 100 cigarettes in his lifetime was defined as a smoker, otherwise he was considered as a non-smoker
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