title: TNF/LTA polymorphisms and risk for gastric cancer/duodenal ulcer in the Korean population.
abstract: The tumor necrosis factor-alpha (TNF) and lymphotoxin-alpha (LTA) are proinflammatory cytokines with immunoregulatory effects. TNF is also known to inhibit gastric acid secretion. Previously we have shown that the known proinflammatory genotypes, IL-1B -31C/+ and IL-1RN *2/*2, were not associated with increased risks for gastric cancer/duodenal ulcer in the Korean population. In this study, we tested the association between the polymorphisms of another candidate cytokine TNF/LTA and 341 gastric cancers, 133 duodenal ulcers, and 261 healthy controls. Five TNF promoter polymorphisms (-1031, -863, -857, -308, and -238) and two LTA polymorphisms (intron 1 and Thr26Asn) were analyzed. Individual polymorphisms were not associated with the gastric cancer and/or duodenal ulcer risk. When a haplotype analysis was performed with seven polymorphisms, differences in haplotype profile between the controls and gastric cancer and/or duodenal ulcer were not statistically significant. However, the frequencies of individual haplotypes C and D, which had opposite alleles at -1031, -863, and -857, showed statistically significant differences between the gastric cancer and duodenal ulcer (P=0.005 and P=0.02, respectively), suggesting that the TNF/LTA genotypes might play an opposite role in the pathogenesis of gastric cancer and duodenal ulcer.
authors.affiliation: Asan Institute for Life Sciences, University of Ulsan College of Medicine, 388-1 Poongnap-Dong, Songpa-Gu, Seoul 138-736, Republic of Korea.
authors.forename: Seong-Gene
authors.initials: SG
authors.lastname: Lee
authors.forename: Byungsik
authors.initials: B
authors.lastname: Kim
authors.forename: Jung-Hwan
authors.initials: JH
authors.lastname: Yook
authors.forename: Sung-Tae
authors.initials: ST
authors.lastname: Oh
authors.forename: Inchul
authors.initials: I
authors.lastname: Lee
authors.forename: Kyuyoung
authors.initials: K
authors.lastname: Song
mesh_terms: D000328:Adult; D000368:Aged; D044466:Asian People / Q000235:genetics*; D016022:Case-Control Studies; D004381:Duodenal Ulcer / Q000150:complications / Q000235:genetics* / Q000473:pathology; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D007723:Korea; D008233:Lymphotoxin-alpha / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics*; D013274:Stomach Neoplasms / Q000150:complications / Q000235:genetics* / Q000473:pathology; D048069:Tumor Necrosis Factors / Q000235:genetics*
chemical_list: D008233:Lymphotoxin-alpha; D048069:Tumor Necrosis Factors