IL18 and cancer: Significant association between -607C/A polymorphism in IL-18 gene promoter and cancer risk was observed (CA vs CC:OR =1.221, 95% CI: 1.096, 1.360; Pheterogeneity=0.219; AA/CA vs. CC:OR =1.203, 95% CI: 1.057, 1.369; Pheterogeneity=0.064).