title: Immunohistochemical evaluation of p53 expression and proliferative activity in children with Helicobacter pylori associated gastritis.
abstract: OBJECTIVE
  The aim of this study was to evaluate the significance of p53 expression and proliferative activity of glandular epithelium and intestinal metaplasia in Helicobacter pylori associated gastritis of pediatric patients.
  
  
  METHODS
  The study included endoscopic gastric biopsies of 54 children with dyspeptic complaints. Immunohistochemistry was performed for evaluation of p53 expression and Ki-67 labeling index, an indicator of proliferative activity. Grading of H. pylori density, intestinal metaplasia and inflammatory cell infiltration were performed in histologic tissue sections stained with hematoxylin-eosin, Giemsa and Alcian-blue.
  
  
  RESULTS
  Of 54 children, 35 (64%) were infected by H. pylori. Positive immunostaining for p53 was observed in 11 of 54 cases (20.4%). H. pylori infection was found in 10 (91%) of the p53-positive patients. There was a positive correlation between H. pylori density and Ki-67 labeling index in H. pylori infected children. H. pylori density, Ki-67 labeling index and inflammatory cell infiltration in the p53-positive group were significantly higher than in the p53-negative group. Although intestinal metaplasia was more common in H. pylori infected children (n = 11; 31.4%), there was no difference in the rate of intestinal metaplasia between the p53-positive and p53-negative groups.
  
  
  CONCLUSIONS
  The present study shows that p53 mutations and higher proliferative activity of glandular epithelium may be related to H. pylori associated gastritis in children. Because p53 mutation does not appear to be associated with intestinal metaplasia, a precursor for gastric cancer in adults, we think that H.pylori associated p53 alterations do not initiate and promote gastric cancer that may occur in adulthood.
authors.affiliation: Department of Pediatric Gastroenterology and Nutrition, Dokuz Eylul University School of Medicine, Izmir, Turkey. yesim.ozturk@deu.edu.tr
authors.forename: Yesim
authors.initials: Y
authors.lastname: Ozturk
authors.forename: Erdener
authors.initials: E
authors.lastname: Ozer
authors.forename: Banu
authors.initials: B
authors.lastname: Lebe
authors.forename: Ozlem
authors.initials: O
authors.lastname: Bekem
authors.forename: Benal
authors.initials: B
authors.lastname: Buyukgebiz
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D005753:Gastric Mucosa / Q000382:microbiology / Q000473:pathology*; D005756:Gastritis / Q000382:microbiology / Q000473:pathology*; D016481:Helicobacter Infections / Q000473:pathology*; D016480:Helicobacter pylori; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D007422:Intestines / Q000473:pathology*; D019394:Ki-67 Antigen / Q000737:chemistry; D008297:Male; D008679:Metaplasia; D011230:Precancerous Conditions; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D019394:Ki-67 Antigen; D016159:Tumor Suppressor Protein p53