title: Differential expression of p53 and p504s in hyperplastic polyp, sessile serrated adenoma and traditional serrated adenoma.
abstract: OBJECTIVE
  Known collectively as serrated polyps, hyperplastic polyps (HP), sessile serrated adenomas (SSA/SSP) and traditional serrated adenoma (TSA) may represent a spectrum of increasing malignant potential with characteristic immunological markers. There is increasing evidence that HP, SSA/SSP and TSA are biologically different and are likely to represent a spectrum along the serrated polyp pathway. Although there is general consensus about the diagnostic features of serrated polyps, the morphological differences between the categories are often subtle. This study compares the expression of p53 and P504S among serrated polyps. Sixty seven randomly selected biopsies (n = 59) and resection specimens (n = 8) histologically diagnosed for SSA/SSP, TSA and HP (19, 30 and 18 specimens, respectively) were obtained.
  
  
  RESULTS
  There was a significant difference in p53 (P < 0.001) and P504S (P < 0.001) immunopositivity and distribution among the serrated polyps. In particular, there is diffuse expression p53 and P504S in TSA compared to HP and SSA/SSP where p53 and P504S expression was more frequently confined to the lower 1/3 of the crypts. In addition, percentage of cells expressing p53 and p504S expression was higher in TSA than those of HP and SSA/SSP.
  
  
  CONCLUSIONS
  Immunostains, p53 and P504S, may be useful adjuncts to morphological diagnosis of serrated polyps.
authors.affiliation: Department of Histopathology, Imperial College London, London, UK. n.ngo@imperial.ac.uk
authors.forename: Nye-Thane
authors.initials: NT
authors.lastname: Ngo
authors.forename: Emile
authors.initials: E
authors.lastname: Tan
authors.forename: Paris
authors.initials: P
authors.lastname: Tekkis
authors.forename: David
authors.initials: D
authors.lastname: Peston
authors.forename: Patrizia
authors.initials: P
authors.lastname: Cohen
mesh_terms: D018256:Adenomatous Polyps / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers; D003110:Colonic Neoplasms / Q000175:diagnosis*; D003111:Colonic Polyps / Q000175:diagnosis*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D008875:Middle Aged; D019998:Racemases and Epimerases / Q000032:analysis*; D016159:Tumor Suppressor Protein p53 / Q000032:analysis*
chemical_list: D015415:Biomarkers; D016159:Tumor Suppressor Protein p53; D019998:Racemases and Epimerases; C108352:alpha-methylacyl-CoA racemase