title: Expression of homeodomain protein CDX2 in colorectal adenoma and adenocarcinoma.
abstract: CDX2 is a homeobox domain-containing transcription factor that is important in the development and differentiation of the intestine. In this study, we examined CDX2 expression in normal and neoplastic human colon using a newly isolated monoclonal antibody. When compared to the intensity observed in adjacent normal mucosal epithelial cells, strong nuclear staining for CDX2 was observed in 10 (100%) of 10 colonic adenomas, 30 (88.2%) of 34 colorectal adenocarcinomas, including 17(94.47%) of 18 well-or moderately differentiated tumors and 13(81.2%) of 16 high-grade tumors. The percentage of CDX2 immunopositive cells was generally lower in carcinomas than in adenomas (p<0.001) and lower in moderately or poorly differentiated tumors than in well-differentiated tumors (p<0.001). There was an inverse correlation between CDX2 expression and tumor grade, tumor stage and lymph node metastasis (respectively, p<0.001; p<0.05; p<0.001), but this was not associated with age, gender, or tumor location and size. These results indicate that loss of expression of CDX2 protein may play an important role in the tumorigenesis of colorectal cancers. Down-regulation of CDX2 may cause dedifferentiation of gastrointestinal epithelial cells.
authors.affiliation: Department of Pathology Kahramanmaras Sutcuimam University, School of Medicine Kahramanmaras, Turkey. sbakaris@yahoo.com
authors.forename: Sevgi
authors.initials: S
authors.lastname: Bakaris
authors.forename: Ali
authors.initials: A
authors.lastname: Cetinkaya
authors.forename: Fikret
authors.initials: F
authors.lastname: Ezberci
authors.forename: Hasan
authors.initials: H
authors.lastname: Ekerbicer
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000556:secondary; D000236:Adenoma / Q000378:metabolism* / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000378:metabolism*; D000071616:CDX2 Transcription Factor; D002452:Cell Count; D002467:Cell Nucleus / Q000378:metabolism / Q000473:pathology; D003106:Colon / Q000033:anatomy & histology / Q000378:metabolism; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology; D015536:Down-Regulation; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect; D018398:Homeodomain Proteins / Q000378:metabolism*; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor; D000071616:CDX2 Transcription Factor; C491270:CDX2 protein, human; D018398:Homeodomain Proteins