Polimorfismos genéticos de interleucinas IL-1B-511, IL-1RN, IL-10, factor de necrosis tumoral α-308 e infección por Helicobacter pylori CagA positivo en cáncer gástrico y úlcera duodenal en diferentes poblaciones en Colombia

Objective: To determine the association between the IL-1B-511, IL-1RN, TNF-alpha-308, IL-10-819 and IL-101082 polymorphisms and positive Heliocobacter pylori CagA infection in a group of patients with gastric cancer and duodenal ulcer in diferent populations in Colombia. Methods: A case-control study was performed on 341 patients: those with non-atrophic gastritis, 194; with gastric cancer, 58; duodenal ulcer with preneoplastic lesion, 54; and with duodenal ulcer, 35. The genotyping of polymorphisms was done with allelic discrimination using PCR in real time, and that for IL-1RN with conventional PCR and agarose electrophoresis. Helicobacter pylori CagA infection was ascertained with ELISA. Logistic regression was used in statistical analysis. Results: Being a carrier of genotype IL-1B-511TT (OR=4.69; CI 95% 1.22-18.09) and being positive for Helicobacter pylori CagA infection (OR=4.43; CI 95% 1.72-11.4) are associated with gastric cancer. Positive Helicobacter pylori CagA infection (OR=4.39; CI 95% 1.82-10.59) is associated with the presence of duodenal ulcer with preneoplastic lesions, being a carrier of genotype IL-1B-511CT is associated with duodenal ulcer (OR=0.30; CI 95% 0.10-0.91). Conclusion: The results suggest that pro-inlammatory response and virulent bacterial genetics are factors related to the diferent outcomes brought about by Helicobacter pylori infection in the population studied; that is, the IL-1B-511 polymorphism is a factor related to gastric cancer and duodenal ulcer, and positive Helicobacter pylori CagA infection is a factor associated with gastric cancer and duodenal ulcer with preneoplastic lesions.