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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Adult, Aged, Asian Continental Ancestry Group, Case-Control Studies, Chi-Square Distribution, Female, Gastritis, Atrophic, Gastroscopy, Gene Frequency, Genetic Predisposition to Disease, Helicobacter Infections, Helicobacter pylori, Humans, Malaysia, Male, Metaplasia, Middle Aged, Phenotype, Polymorphism, Single Nucleotide, Precancerous Conditions, Predictive Value of Tests, Risk Factors, Stomach Neoplasms.
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Are gastric precancerous lesions associated with gene variants in Helicobacter pylori-susceptible ethnic Malays? Context: To identify genes associated with gastric precancerous lesions in Helicobacter pylori (H. pylori)-susceptible ethnic Malays. Twenty-three Malay subjects with H. pylori infection and gastric precancerous lesions identified during endoscopy were included as "cases". Thirty-seven Malay subjects who were H. pylori negative and had no precancerous lesions were included as "controls". Venous blood was collected for genotyping with Affymetrix 50K Xba1 kit. Genotypes with call rates < 90% for autosomal single nucleotide polymorphisms (SNPs) were excluded. For each precancerous lesion, associated SNPs were identified from Manhattan plots, and only SNPs with a χ² P value < 0.05 and Hardy Weinberg Equilibrium P value > 0.5 was considered as significant markers. Of the 23 H. pylori-positive subjects recruited, one sample was excluded from further analysis due to a low genotyping call rate. Of the 22 H. pylori-positive samples, atrophic gastritis only was present in 50.0%, complete intestinal metaplasia was present in 18.25%, both incomplete intestinal metaplasia and dysplasia was present in 22.7%, and dysplasia only was present in 9.1%. SNPs rs9315542 (UFM1 gene), rs6878265 (THBS4 gene), rs1042194 (CYP2C19 gene) and rs10505799 (MGST1 gene) were significantly associated with atrophic gastritis, complete intestinal metaplasia, incomplete metaplasia with foci of dysplasia and dysplasia, respectively. Allele frequencies in "cases" vs "controls" for rs9315542, rs6878265, rs1042194 and rs10505799 were 0.4 vs 0.06, 0.6 vs 0.01, 0.6 vs 0.01 and 0.5 vs 0.02, respectively.
assistant
Genetic variants possibly related to gastric precancerous lesions in ethnic Malays susceptible to H. pylori infection were identified for testing in subsequent trials. Final Decision: yes