title: Morphological changes in human gastric tumours after eradication therapy of Helicobacter pylori in a short-term follow-up.
abstract: BACKGROUND
  It is controversial as to whether the development of gastric cancer is influenced by Helicobacter pylori eradication. If eradication itself influences the tumour morphology, this may affect the tumour discovery rate.
  
  
  OBJECTIVE
  To investigate the morphological changes in the gastric neoplasm after H. pylori eradication.
  
  
  METHODS
  We studied 37 patients with eradication therapy. After a 1-month follow-up, endoscopic re-evaluation was performed and the appearance was compared with first image. All lesions were resected endoscopically, and were subjected to histological assessment and to immunohistochemistry. Serum gastrin levels were determined before and after eradication.
  
  
  RESULTS
  Twenty-nine of 37 patients underwent successful eradication. The appearance of 11 lesions (33% of 33 lesions) became indistinct after successful eradication. All lesions were of the superficial-elevated type and the height of the lesions decreased. We detected normal columnar epithelium over the neoplasm in eight of the lesions. Higher expression of single-stranded deoxyribonucleic acid in the deep area was characteristic in tumours with an indistinct appearance. These changes did not correlate with the serum gastrin levels.
  
  
  CONCLUSIONS
  The morphology of the gastric neoplasm change after eradication in the short-term. This may contribute to the decreased tumour discovery rate.
authors.affiliation: Department of Medicine and Molecular Science, Hiroshima University, Hiroshima, Japan. maito@hiroshima-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Ito
authors.forename: S
authors.initials: S
authors.lastname: Tanaka
authors.forename: S
authors.initials: S
authors.lastname: Takata
authors.forename: S
authors.initials: S
authors.lastname: Oka
authors.forename: S
authors.initials: S
authors.lastname: Imagawa
authors.forename: H
authors.initials: H
authors.lastname: Ueda
authors.forename: Y
authors.initials: Y
authors.lastname: Egi
authors.forename: Y
authors.initials: Y
authors.lastname: Kitadai
authors.forename: W
authors.initials: W
authors.lastname: Yasui
authors.forename: M
authors.initials: M
authors.lastname: Yoshihara
authors.forename: K
authors.initials: K
authors.lastname: Haruma
authors.forename: K
authors.initials: K
authors.lastname: Chayama
mesh_terms: D000230:Adenocarcinoma / Q000382:microbiology / Q000473:pathology*; D000236:Adenoma / Q000382:microbiology / Q000473:pathology*; D000368:Aged; D000369:Aged, 80 and over; D016099:Endoscopy, Gastrointestinal; D005260:Female; D005500:Follow-Up Studies; D005755:Gastrins / Q000378:metabolism; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D020116:Pepsinogen A / Q000097:blood; D013274:Stomach Neoplasms / Q000097:blood / Q000382:microbiology / Q000473:pathology*
chemical_list: D005755:Gastrins; D019394:Ki-67 Antigen; D020116:Pepsinogen A