Review and pooled analysis of studies on -607(C/A) and -137(G/C) polymorphisms in IL-18 and cancer risk

Mi, Yuan-Yuan; Yu, Qian-Qian; Yu, Meng-Lei; Xu, Bin; Zhang, Li-Feng; Cheng, Wei; Zhang, Wei; Hua, Li-Xin; Feng, Ning-Han
December 2011
Medical Oncology;Dec2011, Vol. 28 Issue 4, p1107
Academic Journal
Interleukin-18 (IL-18) is a pleiotropic, pro-inflammatory cytokine with dual effects on tumor development and progression. The -607(C/A) and -137(G/C) polymorphisms in IL-18 gene region have been implicated in cancer risk; however, data from published studies with individually low statistical power are conflicting. To clarify the role of IL-18 -607(C/A) and -137(G/C) genotype in global cancer, we examined all the available published studies through a pooled analysis approach. Overall, IL-18 -607A allele was associated with increased total cancer risk when compared with -607C allele (OR = 1.14, 95% CI = 1.01-1.28, P = 0.010), as well as in the heterozygote comparison (OR = 1.10, 95% CI = 1.04-1.15, P = 0.256) and the dominant model (OR = 1.07, 95% CI = 1.03-1.11, P = 0.124). Furthermore, IL-18 -137(G/C) polymorphism was associated with increased nasopharyngeal carcinoma risk. In the stratified analysis for -607(C/A) polymorphism, a significantly increased cancer risk in Asian population was found, as well as subgroup in source of control. Similar results were found in the stratified analysis for -137(G/C) polymorphism. Our pooled analysis supported that IL-18 is a good candidate for large-scale epidemiological case-control studies that may be a low-penetrance susceptibility biomarker for cancer.


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