title: Immunohistochemical localization of epithelial glycoprotein EGP-2 and carcinoembryonic antigen in normal colonic mucosa and colorectal tumors.
abstract: Epithelial glycoprotein EGP-2 and carcinoembryonic antigen (CEA) are transmembrane glycoproteins and cell surface markers. Eighty-four colorectal tumors including 23 adenomas (2 mild, 13 moderate, and 8 severe atypia) and 61 adenocarcinomas (33 well- and 28 moderately differentiated) as well as adjacent normal colonic mucosa (51 cases) were studied for the immunolocalization of EGP-2 as detected by the monoclonal antibody VU-1D9, and compared with CEA expression. In the normal colonic mucosa, basolateral VU-1D9 expression in the surface epithelial cells was constantly seen in all 51 cases, while weak apical CEA staining in the surface epithelium was seen in 25% (13/51) of the cases. In 91% (21/23) of the adenomas, regardless of the grade of atypia, VU-1D9 labeled the basolateral membrane of a few surface lining cells leaving atypically proliferating glands negative, while CEA expressed strong apical staining in the surface epithelial cells as well as atypically proliferating glands. The well-differentiated adenocarcinomas showed homogeneous basolateral staining for VU-1D9 and strong apical staining for CEA; the moderately differentiated adenocarcinomas showed membranous as well as cytoplasmic VU-1D9 staining and luminal as well as cytoplasmic CEA staining. The VU-1D9 and CEA localizations and the stage of expression in relation to tumor progression were completely different. Strong CEA expression was seen in the adenomatous stage, while the homogeneous VU-1D9 expression required tumor progression to the carcinomatous stage. VU-1D9 especially when applied in combination with CEA, will be a useful marker for colorectal lesions, and its reactivity patterns in carcinoma can predict the prognosis.
authors.affiliation: Department of Pathology II, Kansai Medical University, Osaka, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Ogura
authors.forename: H
authors.initials: H
authors.lastname: Senzaki
authors.forename: K
authors.initials: K
authors.lastname: Yoshizawa
authors.forename: K
authors.initials: K
authors.lastname: Hioki
authors.forename: A
authors.initials: A
authors.lastname: Tsubura
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000951:Antigens, Neoplasm / Q000032:analysis*; D014408:Biomarkers, Tumor / Q000032:analysis*; D002272:Carcinoembryonic Antigen / Q000032:analysis*; D015815:Cell Adhesion Molecules / Q000032:analysis*; D002454:Cell Differentiation; D003106:Colon / Q000166:cytology / Q000378:metabolism*; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D000071858:Epithelial Cell Adhesion Molecule; D004848:Epithelium / Q000378:metabolism / Q000473:pathology; D005260:Female; D006023:Glycoproteins / Q000032:analysis; D006801:Humans; D007150:Immunohistochemistry; D007413:Intestinal Mucosa / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D015996:Survival Rate
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D002272:Carcinoembryonic Antigen; D015815:Cell Adhesion Molecules; D000071858:Epithelial Cell Adhesion Molecule; D006023:Glycoproteins