title: Cyclooxygenase 2, p53, beta-catenin, and APC protein expression in gastric adenomatous polyps.
abstract: Gastric adenomatous polyps are rare findings in upper gastrointestinal endoscopy; however, they are associated strongly with malignant transformation. Few series describe the oncogenic characteristics of gastric adenomas. In the present study, we immunohisto-chemically assessed the expression of cyclooxygenase (COX)-2, beta-catenin, p53, and adenomatous polyposis coli (APC) in paraffin-embedded specimens of 14 gastric adenomas. Control samples of normal gastric tissue and gastric adenocarcinoma also were analyzed. Of the adenomas, 7 demonstrated overexpression of COX-2, and all demonstrated nuclear p53 accumulation. Accumulation of beta-catenin in the nucleus and cytoplasm was detected in 38% (3/8) of specimens. Loss of APC staining was observed in 50% (4/8). Similar alterations in oncoprotein expression were seen in gastric cancers but not in normal control sections. Gastric adenomas display alterations in the expression of COX-2, beta-catenin, and APC similar to those seen in adenocarcinomas; however, accumulation of p53 was significantly more common in adenomas than in cancers.
authors.affiliation: Academic Department of Adult and Paediatric Gastroenterology, Barts and the London Queen Mary's University of London School, of Medicine and Dentistry, London, England.
authors.forename: Geoff V
authors.initials: GV
authors.lastname: Smith
authors.forename: Roger
authors.initials: R
authors.lastname: Feakins
authors.forename: Michael J G
authors.initials: MJ
authors.lastname: Farthing
authors.forename: Anne
authors.initials: A
authors.lastname: Ballinger
mesh_terms: D025601:Adenomatous Polyposis Coli Protein / Q000378:metabolism*; D018256:Adenomatous Polyps / Q000378:metabolism* / Q000473:pathology; D014408:Biomarkers, Tumor / Q000378:metabolism; D051546:Cyclooxygenase 2; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D006801:Humans; D008565:Membrane Proteins; D009363:Neoplasm Proteins / Q000378:metabolism; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology; D015534:Trans-Activators / Q000378:metabolism*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D051176:beta Catenin
chemical_list: D025601:Adenomatous Polyposis Coli Protein; D014408:Biomarkers, Tumor; C495270:CTNNB1 protein, human; D003598:Cytoskeletal Proteins; D008565:Membrane Proteins; D009363:Neoplasm Proteins; D015534:Trans-Activators; D016159:Tumor Suppressor Protein p53; D051176:beta Catenin; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases