[Show abstract][Hide abstract] ABSTRACT: In order to assess whether inherited genetic variability in the mucin genes associates with the evolution of gastric cancer precursor lesions (GCPLs), we genotyped 22 tagSNPs in MUC1, MUC6 and MUC2 genes of 387 patients with GCPLs that had been followed up for 12.8 years. According to the diagnosis at recruitment and at the end of follow-up, the lesions did not change in 43.1% of the patients, regressed in 28.7% and progressed in 28.2%. Three SNPs in the 3'-moiety of MUC2 were significantly associated with a decreased risk of progression of the lesions, whereas another four SNPs, located at the 5'-moiety, were found to be significantly associated either with increased [one single-nucleotide polymorphism (SNP)] or decreased (three SNPs) probability of regression. Stratified analysis indicated that significance was maintained only in those subjects positive for Helicobacter pylori infection and in those not consuming non-steroidal anti-inflammatory drugs, which were found protective against lesion progression. Haplotype analyses indicated the presence of two haplotypes, one in each moiety of the gene, that were significantly associated with decreased risk of progression of the lesions [odds ratio (OR) = 0.49 and 0.46; 95% confidence interval (CI) = 0.28-0.85 and 0.25-0.86, respectively]. The 5'-end haplotype was also associated with increased probability of regression (OR = 1.67; 95% CI = 1.02-2.73), altogether suggesting a protective role against progression of the precancerous lesions. No significant association was found with variants in MUC1 and MUC6 genes. These results indicate, for the first time, that genetic variability in MUC2 is associated with evolution of GCPLs, especially in H.pylori infected patients, suggesting a role of this secreted mucin in gastric carcinogenesis.
[Show abstract][Hide abstract] ABSTRACT: The American Journal of Gastroenterology is published by Nature Publishing Group (NPG) on behalf of the American College of Gastroenterology (ACG). Ranked the #1 clinical journal covering gastroenterology and hepatology*, The American Journal of Gastroenterology (AJG) provides practical and professional support for clinicians dealing with the gastroenterological disorders seen most often in patients. Published with practicing clinicians in mind, the journal aims to be easily accessible, organizing its content by topic, both online and in print. www.amjgastro.com, *2007 Journal Citation Report (Thomson Reuters, 2008)
No preview · Article · Jan 2012 · The American Journal of Gastroenterology
[Show abstract][Hide abstract] ABSTRACT: There are no established predictive markers of progression of gastric preneoplastic lesions. The aim of this study was to analyze the relationship between Helicobacter pylori cagA and vacA genotypes and progression of gastric preneoplastic lesions.
This was a follow-up study that carried out in a province of Spain with a high risk of gastric cancer. A total of 312 patients who underwent upper endoscopy with gastric biopsy in 1988-1994 with diagnoses of normal mucosa, non-atrophic gastritis (NAG), non-metaplastic multifocal atrophic gastritis (MAG), and complete or incomplete intestinal metaplasia (IM), and who accepted to undergo a new biopsy during 2005-2007 or had an end point during follow-up, were included in this study. Detection and characterization of H. pylori cagA and vacA genotypes was performed directly in baseline paraffin-embedded gastric biopsy specimens by PCR followed by reverse hybridization onto a line probe assay. Inter- and intra-observer variability of histological diagnosis was assessed. Analysis was done using unconditional logistic regression.
The mean age of patients was 48.5 years (45% males) and the mean of follow-up was 12.8 years. H. pylori strains harboring cagA, vacA s1, and vacA m1 genotypes were more frequently found in patients with more advanced gastric preneoplastic lesions. Infection with cagA-positive, vacA s1, and vacA m1 strains was associated with progression of gastric preneoplastic lesions (multivariate odds ratio (OR)=2.28, 95% confidence interval (CI) 1.13-4.58; OR=2.90, 95% CI 1.38-6.13; and OR=3.38, 95% CI 1.34-8.53, respectively). Infection with strains that are simultaneously cagA positive and vacA s1/m1 was associated with progression of gastric precancerous lesions with an OR of 4.80 (95% CI 1.71-13.5) in relation to those infected with cagA-negative/vacA s2/m2 strains.
H. pylori genotyping may be useful for the identification of patients at high risk of progression of gastric preneoplastic lesions and who need more intensive surveillance.
No preview · Article · Feb 2011 · The American Journal of Gastroenterology
[Show abstract][Hide abstract] ABSTRACT: There are no established criteria to classify patients into high or low risk of progressing to gastric cancer (GC). The aim of the study was to identify predictors of GC occurrence among patients with gastric preneoplastic lesions. A prospective and retrospective follow-up study was carried out in a province in Spain with one of the highest risk of GC. The study included 478 patients who underwent gastric biopsy in 1988-1994 with diagnoses of normal mucosa, nonatrophic gastritis (NAG), non-metaplastic multifocal atrophic gastritis (MAG) and complete or incomplete intestinal metaplasia (IM) and who accepted to undergo a new biopsy during 2005-2007 or had an event during follow up. Inter- and intra-observer variability of histological diagnosis was assessed. Analysis was done using Cox proportional hazards risk (HR) models. The mean age of the patients was 50 years, 47% were males and the mean follow-up time was 12.8 years. During follow-up, 23 GC (4.8%) were diagnosed (21 adenocarcinomas and 2 lymphomas) with an incidence of 3.77 per 1,000 person per year. The incidence rate of GC for those with incomplete IM was 16.5 per 1,000 person years. Out the 21 adenocarcinomas, 16 had an incomplete IM in the baseline diagnosis. Incomplete IM (HR 11.3; 95% CI 3.8-33.9) and a family history of GC (HR 6.1; 95% CI 1.7-22.4) were the strongest risk factors for gastric adenocarcinoma. Subtyping of IM and family history of GC may be useful for the identification of high-risk patients who need more intensive surveillance.
Full-text · Article · Dec 2010 · International Journal of Cancer