INTRODUCTION Genetic variability of Helicobacter pylori is associated with various gastrointestinal diseases; however, little is known regarding its interaction with sociodemographic and dietary factors in the development of premalignant lesions.OBJECTIVE To evaluate the association between Helicobacter genotypes, salt intake, and sociodemographic factors with precursor lesions of gastric malignancyMATERIALS AND METHODS An analytical study was conducted including cases (patients with gastric atrophy, intestinal metaplasia, and dysplasia) and controls (patients with non-atrophic gastritis). Sociodemographic information and salt intake habits were obtained using a questionnaire. Histopathological diagnosis was made according to the Sydney System. Genotypes cagA and vacA for H. pylori were established using polymerase chain reaction in paraffin blocks. ANOVA was used for analyzing quantitative variables. Categorical variables are presented as proportions and absolute frequencies. The effect of each variable on the outcome (premalignant lesion) is presented as OR and 95%CI. A p-value of <0.05 was considered as significant.RESULTS The genotype vacA/s1m1 increases the risk of developing precursor lesions of malignancy (OR: 3.82; 95%CI: 1.45–10.07; p = 0.007). Age and salt intake showed a positive interaction effect for the genotype s1m1 (adjusted OR: 5.19; 95%CI: 1.88–14.32; p = 0.001) and bacterial coinfection (adjusted OR: 3.2; 95%CI: 1.06–9.59; p = 0.038). The cagA genotype was not related with the development of premalignant lesions (OR: 1.21; 95%CI: 0.80–1.82; p = 0.361).CONCLUSIONS The vacA genotypes, age, and salt intake are indicators of the risk of premalignant lesions in the study population.
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