RESUMO
Objective To study the association between cytotoxin-associated gene A of Helicobacter pylori (Hp-CagA) and the expressions of mtp53 and c-myc protein in different subtypes of intestinal metaplasia.Methods One hundred and sixty-five patients with gastroscopy included 125 cases with chronic atrophic gastritis with intestinal metaplasia,40 cases with non-atrophic gastritis.Intestinal metaplasia included complete intestinal metaplasia,incompletetype intestinal metaplasia,complete colonic epithelial metaplasia and incomplete colonic epithelial metaplasia.The carbon-14-urea breath test was used to determine Helicobacter pylori (Hp);AB-PAS and HID-AB mucinous staining was used to distinguish intestinal metaplasia subtypes; the immunohistochemical Elivision method was used to determine the expressions ofmtp53 and c-myc protein;indirect ELISA was used to determine Hp-CagA.Results Forty-five cases with incomplete colonic epithelial metaplasia,47 cases with incomplete type intestinal metaplasta,17 cases with complete colonic epithelial metaplasia,16 cases with complete intestinal metaplasia.The positive rate of Hp-CagA in all intestinal metaplasia subtypes was higher than that in non-atrophic gastritis,but there was no significant difference (P ＞ 0.05).The expression of mtp53 protein in incomplete colonic type of intestinal metaplasia with Hp-CagA positive was higher than that in incomplete colonic type of intestinal metaplasia with Hp-CagA negative (x2 =5.494,P ＜ 0.05).The expression of c-myc protein in incomplete colonic type of intestinal metaplasia with Hp-CagA positive was higher than that in incomplete colonic type of intestinal metaplasia with Hp-CagA negative (x2 =13.950,P ＜ 0.01).Conclusion Hp-CagA is a sort of highly virulent strain,and Hp-CagA may do a strong role in the promotion of gastric atrophy and intestinal metaplasia.