Câncer de coto gátrico em ratos: papel da associação de Helicobacter pylori e refluxo êntero-gástrico

BACKGROUND: Gastric carcinogenesis is still under investigation. Our objective is to evaluate a possible relationship between H.pylori and entero-gastric reflux in the genesis of epithelial neoplasias after Billroth II gastrectomy in rats. METHODS: Twenty male Wistar rats were divided into two groups. Group I rats underwent laparotomy and group II had a Billroth II gastrectomy performed. After nine months, survivors were killed and their stomachs analysed for quantification of H.pylori and for pre-neoplastic and neoplastic changes of the epithelium. RESULTS: Group II animals had a significant higher percentage of colonization by H.pylori and their epithelium had more pathological changes that ranged from a higher number of mitotic cells to invasive carcinoma. CONCLUSION: The percentage of glandular involvement by H.pylori increases with entero-gastric reflux after partial gastrectomy and is associated to the development of gastric stump cancer in rats.