title: An investigation of the rate of cyclooxygenase-2 expression on the surface of adenomatous and colorectal adenocarcinoma polyps.
abstract: BACKGROUND
  Colorectal cancer (CRC) (adenomatous, adenocarcinoma) is one of the major causes of mortality and morbidity in human societies. Considering the importance of cyclooxygenase-2 (COX-2) expression in the incidence of CRC, in this study, the rate of COX-2 gene expression on polyps and CRCs were addressed.
  
  
  METHODS
  This is a cross-sectional descriptive analytic study carried out on the blocks of sampled tissue of adenomatous and colorectal adenocarcinoma polyps on 68 patients referred to Digestive Clinic in Isfahan Shariati Hospital in 2013. Patients were divided into two groups of polyps (n = 52) and cancer (n = 16). Given the presence of CRC or polyps by colonoscopy, samples were sent to the laboratory to measure the rate of COX-2 gene expression using immunohistochemistry.
  
  
  RESULTS
  In polyp group, 41 individuals (78.8%) had two or <2 polyps, 24 cases (46.2%) had a tubular polyp, and about a third of all patients had a big polyp. The most frequency of the polyp site was related to sigmoid with 19 cases (36.54%), in cancer group, it was related to the rectum with 9 cases (56.25%) that there was no significant difference between two groups (P < 0.05). The overall prevalence of COX-2 expression was positive in 51 cases (75%) and negative in 17 cases (25%). COX-2 gene expression was separately observed in 38 individuals (73.10%) in the polyp group and in 13 cases (81.25%) in the cancer group, and no significant difference was found (P > 0.05).
  
  
  CONCLUSIONS
  There is no relationship between COX-2 gene expression and the surface of adenomatous and colorectal adenocarcinoma polyps.
authors.affiliation: Department of Internal Medicine, Arak University of Medical Sciences, Arak, Iran.
authors.forename: Ramin
authors.initials: R
authors.lastname: Baghaei
authors.affiliation: Department of Pathology, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Mozhdeh
authors.initials: M
authors.lastname: Beiraghdar
authors.affiliation: Department of Internal Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Sobhani
authors.affiliation: Department of Gastroenclogy, Islamic Azad University of Najaf Abad, Isfahan, Iran.
authors.forename: Rahmatolah
authors.initials: R
authors.lastname: Rafei
authors.affiliation: Department of General Physician, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Leila
authors.initials: L
authors.lastname: Kolahi
authors.affiliation: Department of Pathology, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Lotfolah
authors.initials: L
authors.lastname: Foladi
keywords: Adenomatous colorectal cancer; colorectal adenocarcinoma polyps; cyclooxygenase-2 expression