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  • Title: Interleukin-8 gene polymorphism associated with susceptibility to non-cardia gastric carcinoma with microsatellite instability.
    Author: Shirai K, Ohmiya N, Taguchi A, Mabuchi N, Yatsuya H, Itoh A, Hirooka Y, Niwa Y, Mori N, Goto H.
    Journal: J Gastroenterol Hepatol; 2006 Jul; 21(7):1129-35. PubMed ID: 16824064.
    Abstract:
    BACKGROUND AND AIM: Gastric carcinoma (GC) with microsatellite instability (MSI) exhibits clinicopathological characteristics distinct from microsatellite-stable (MSS) GC. Both MSI and MSS carcinomas are mostly associated with chronic gastritis infected by Helicobacter pylori (Hp). The relationship between Hp-induced inflammation and the mutator pathway of MSI remains unclear. Recently, cytokine polymorphisms have been reported to affect the development of non-cardia GC. The objective of this study was to elucidate the relationship between cytokine polymorphisms and MSI phenotypes. METHODS: In a case-control study including 482 controls and 181 patients with GC, interleukin (IL)-8 -251, IL-1B-511, IL-1RN, and tumor necrosis factor-A (TNFA) -857 polymorphisms were genotyped. The presence of MSI and mutations in exons 5 to 8 of the p53 gene were examined in GC cases. All clinicopathological data were collected from individual records. RESULTS: High and low frequency of MSI (MSI-H and MSI-L) and MSS were detected in 16 (8.8%), 14 (7.7%) and 151 (83.4%) GC cases, respectively. We found that IL-8 -251 T/T genotype was significantly associated with increased risk of MSI-H GC compared to MSI-L/MSS GC and controls. We found no association between other cytokine polymorphisms and MSI-H GC. The percentage of smokers and the frequency of p53 mutations were significantly lower in MSI-H than MSI-L/MSS GC. We found significant associations of MSI-H with synchronous or metachronous multiple occurrence, antral location and intestinal type. CONCLUSIONS: Our study shows that MSI-H GC is associated with IL-8-251 T/T (low expression genotype) and is inversely correlated with cigarette smoking.
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