Original Contribution
The American Journal of Gastroenterology (2005) 100, 290–294; doi:10.1111/j.1572-0241.2005.40806.x
TNF Gene Polymorphisms and Helicobacter Pylori Infection in Gastric Carcinogenesis in Chinese Population
Chun Li PhD1, Bing Xia MD, PhD1, Yi Yang PhD1, Jin Li MD, PhD1 and Harry Hua-Xiang Xia MD, PhD1
1Department of Internal Medicine, Wuhan University Zhongnan Hospital, Wuhan; and Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong, Peoples Republic of China
Correspondence: Bing Xia, MD, PhD, Department of Internal Medicine, Wuhan University Zhongnan Hospital, Donghu Road 169, Wuhan 430071, Hubei Province, People Republic of China
Received 15 May 2004; Revised 0000; Accepted 28 June 2004.
Abstract
BACKGROUND AND AIMS:
Helicobacter pylori (H. pylori) is a major cause of chronic gastritis and peptic ulcer disease, and a definite carcinogen for gastric adenocarcinoma. However, the underlying pathogenic mechanisms have not been fully understood although the interactions between environmental, bacterial, and multiple genetic components are likely to be involved. Tumor necrosis factor (TNF) is a key cytokine involved in H. pylori-induced gastric inflammation. The present study aimed to determine the di-allelic polymorphisms of TNF gene and their association with H. pylori infection and gastroduodenal diseases in Chinese population of Han nationality.
METHODS:
Two hundred and ten patients with gastroduodenal diseases (73 chronic gastritis, 78 duodenal ulcer, and 59 noncardia gastric cancer) and 264 healthy controls were genotyped by the PCR-RFLP method for TNF-
308, lymphotoxin- (LT-) NcoI, and AspHI gene polymorphisms. H. pylori infection status was determined by a validated serological test.
RESULTS:
H. pylori infection was detected in 90.5% of 210 patients and 62.1% of 264 healthy controls (p < 0.0001; odds ratio [OR]= 5.793; 95%CI: 3.431–9.780). Frequency of LT-NcoI A/G genotype in patients with noncardia gastric cancer with H. pylori infection was significantly higher than that in H. pylori-positive healthy controls (64.0%vs 46.0%; p= 0.0297; OR = 2.026; 95%CI: 1.080–3.803). There were no other associations between TNF-
308, LT-NcoI, and AspHI gene polymorphisms and H. pylori infection in gastroduodenal diseases.
CONCLUSIONS:
LT-NcoI A/G heterozygous genotype was associated with H. pylori infection in patients with noncardia gastric cancer in Chinese Han population.
