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Helicobacter pylori and Epstein-Barr virus infection and the p53 tumour suppressor pathway in gastric stump cancer compared with carcinoma in the non-operated stomach.
  1. I O Baas,
  2. B P van Rees,
  3. A Musler,
  4. M E Craanen,
  5. G N Tytgat,
  6. F M van den Berg,
  7. G J Offerhaus
  1. Department of Pathology, University of Amsterdam, The Netherlands. i.o.baas@amc.uva.nl

    Abstract

    AIM: To evaluate similarities and differences between gastric stump cancer and conventional carcinoma in the non-operated stomach. METHODS: 26 stump carcinomas were compared with 24 conventional stomach cancers. Stage, histological type, and demographics were comparable in the two groups. Expression of p53 and p21-Waf1/Cip1 was evaluated by immunohistochemical staining. Helicobacter pylori infection was evaluated by examining haematoxylin-eosin stained slides and immunohistochemistry. Epstein-Barr virus infection was evaluated by RNA in situ hybridisation. RESULTS: Expression of p53 and p21-Waf1/Cip1 was similar in both groups and positive in more than half of the patients. H pylori infection was observed in six stump carcinomas and 17 conventional carcinomas in the intact stomach (p < 0.01). RNA in situ hybridisation (EBER1-ISH) for Epstein-Barr virus was positive in nine stump carcinomas and two carcinomas in the non-operated stomach (p < 0.05). CONCLUSIONS: There appear to be aetiological differences between stump carcinoma and cancer in the intact stomach. Further study of these differences may improve our understanding of gastric carcinogenesis in general.

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