Interleukin-4 and -8 Gene Polymorphisms and Risk of Gastric Cancer in a Population in Southwestern China

  • Pan, Xiong-Fei (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Wen, Ying (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Loh, Marie (Cancer Science Institute of Singapore, National University of Singapore) ;
  • Wen, Yuan-Yuan (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Yang, Shu-Juan (Department of Child and Adolescent Health, West China School of Public Health, Sichuan University) ;
  • Zhao, Zhi-Mei (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Tian, Zhi (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Huang, He (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Lan, Hui (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Chen, Feng (Department of Epidemiology, West China School of Public Health, Sichuan University) ;
  • Soong, Richie (Cancer Science Institute of Singapore, National University of Singapore) ;
  • Yang, Chun-Xia (Department of Epidemiology, West China School of Public Health, Sichuan University)
  • Published : 2014.04.01


Background: Gastric carcinogenesis is a complicated process that involves environmental and genetic factors like interleukin-4 (IL-4) and IL-8. Single nucleotide polymorphisms in their genes are associated with changed levels of gene expression. Here, we investigated the association between IL4-590 C>T and IL8-251T>A and gastric cancer (GC) risk in Sichuan of Southwestern China. Materials and Methods: We surveyed the research subjects using a self-designed questionnaire with questions on demographic factors and putative risk factors. Approximately 2-5ml of whole blood was collected after field survey to analyze IL4-590 C>T and IL8-251T>A genotypes using MALDI-TOF MS. Results: Our study recruited 308 pairs of GC patients and controls, including 224 (72.7%) men and 84 (27.3%) women in each group. There were 99 cardia and 176 noncardia GC patients in the case group. The case and control groups had an average age of $57.7{\pm}10.6$ ($mean{\pm}SD$) and $57.6{\pm}11.1$ years. GC patients reported a significantly greater proportion of family history of cancer (29.9% vs 10.7%, p<0.01) and drinking (54.6% vs 43.2%, p<0.01) than did controls. Variant genotypes of IL-4-590 C>T and IL-8-251 T>A were not associated with overall GC risk (adjusted OR, 0.89; 95%CI, 0.61-1.28 for CT or CC vs TT; adjusted OR, 1.14; 95%CI, 0.86-1.79 for TA or AA vs TT). Stratification analysis of two SNPs for risk by subsites only found that variant IL-8-251 TA or AA genotype was associated with increased noncardia GC risk (adjusted OR, 2.58; 95%CI, 1.19-5.57). We did not observe interactions between the IL-8-251 T>A genotype and smoking (adjusted OR, 0.38; 95%CI, 0.08-1.79) or drinking (adjusted OR, 0.36; 95%CI, 0.08-1.65) for risk of noncardia GC. Conclusions: Our data indicate no association between the two SNPs of IL-4-590 and IL-8-251 with overall GC risk, while the IL-8-251 TA or AA genotype conferred risk of cardia GC. Our findings contribute to the evidence body for risk of SNPs associated with the development of gastric cancer in this region.


Gastric cancer;interleukin-4 gene;interleukin-8 gene;polymorphism;risk;case-control study


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