Gastroenterology

Gastroenterology

Volume 125, Issue 2, August 2003, Pages 364-371
Gastroenterology

Clinical-alimentary tract
A proinflammatory genetic profile increases the risk for chronic atrophic gastritis and gastric carcinoma

https://doi.org/10.1016/S0016-5085(03)00899-0Get rights and content

Abstract

Background & Aims:

Pro-inflammatory polymorphisms within the genes interleukin (IL)-1B and IL-1RN are associated with risk for gastric carcinoma (GC) in Helicobacter pylori—infected individuals. We aimed to determine the association between variation of the tumor necrosis factor (TNF)-α gene and the risk for chronic atrophic gastritis (CAG) and GC. We also investigated the extent to which the combined effect of proinflammatory genetic polymorphisms (IL-1B, IL-1RN, and TNF-α), and the combined effect of TNF-α and bacterial genotypes each influence such a risk.

Methods:

In a case-control study including 306 controls, 221 individuals with chronic gastritis, and 287 GC patients, the TNF-α-308 and IL-1B-511 bi-allelic polymorphisms, the IL-1RN variable number of tandem repeats (VNTR), and the H. pylori genes vacA (s and m regions) and cagA were genotyped.

Results:

We found that carriers of the TNF-α-308∗A allele are at increased risk for GC development with an odds ratio (OR) of 1.9 (95% confidence interval [CI], 1.3–2.7). For both CAG and GC, the odds of developing disease increased with the number of high-risk genotypes. Individuals carrying high-risk genotypes at the 3 loci are at increased risk for CAG and GC with an OR of 5.8 (95% CI, 1.1–31.0) and 9.7 (95% CI, 2.6–36.0), respectively. The risk for GC was not affected significantly by the combination of bacterial and TNF-α-308 genotypes.

Conclusions:

These findings show that a proinflammatory polymorphism in the TNF-α gene is associated with increased risk for GC, and that it is possible to define a specific genetic profile associated with highest risk for CAG and GC.

Section snippets

Study population

A total of 814 subjects from the north of Portugal were enrolled in this study, comprising unselected controls (n = 306), individuals with chronic gastritis (n = 221), and GC patients (n = 287). The control group consisted of healthy blood donors (mean age, 37 yr; median age, 35 yr; range, 18–64 yr; male:female ratio, 1.7:1). Individuals with chronic gastritis (mean age, 43 yr; median age, 43 yr; range, 24–62 yr; male:female ratio, 12.8:1) were recruited from among shipyard workers who had

Results

Genotype frequencies of the IL-1B-511, IL-1RN VNTR, and TNF-α-308 polymorphisms in the control group did not deviate significantly from those expected under Hardy-Weinberg equilibrium (P = 0.3, P = 0.6, and P = 0.8, respectively; Table 1). The genotype frequencies among chronic nonatrophic gastritis (CNAG) subjects, CAG subjects, and GC patients of all the individual loci studied are summarized in Table 1.

In the group of individuals with CAG we found that carriers of the proinflammatory allele

Discussion

The first consequence of H. pylori infection is the development of neutrophilic gastritis, which progresses to active chronic gastritis in most people.28 Recruitment and activation of immune cells in the underlying mucosa involves, among other molecules, proinflammatory cytokines such as IL-1β and TNF-α as part of nonspecific immunity.29 The complex network of cytokines implicated in these inflammatory responses includes counter-regulatory elements, such as IL-1ra, which act to down-regulate

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    Supported by the Fundação para a Ciência e Tecnologia (Programa Operacional Ciência, Tecnologia e Inovação/ESP/43650/1999; PRAXIS/C/SAU/35374/99; and Programa Operacional Ciência, Tecnologia e Inovação/CBO/41550/2001), by the Programa Operacional Ciência, Tecnologia e Inovação do Quadro Comunitário de Apoio II, by the Fundação Luso-Americana para o Desenvolvimento, and by Fundação Calouste Gulbenkian.

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