title: Osteopontin (OPN) expression in thyroid carcinoma.
abstract: BACKGROUND
  Osteopontin (OPN) and its interacting partner CEA-cell adhesion molecule (CEACAM1) mediate similar biological functions and have been expressed in several types of cancer. Here we investigated the prognostic significance of OPN in thyroid tumours and correlated our findings with the expression of CEACAM1.
  
  
  METHODS
  297 human thyroid samples were collected in a tissue microarray and as fresh frozen samples to perform immunohistochemistry and western blotting for OPN and to compare these data with our previously published data on CEACAM1 expression.
  
  
  RESULTS
  Nearly all normal samples were negative for OPN. Some thyroid adenomas were weakly OPN positive whereas many carcinomas were strongly positive. In contrast to CEACAM1, which was preferentially expressed in metastatic papillary carcinomas, no associations were found between OPN expression and patient age, gender and tumour size.
  
  
  CONCLUSIONS
  These results may have future implications for the diagnosis and management of patients with thyroid cancers.
authors.affiliation: Department of Laboratory Medicine and Pathobiology, University of Toronto, Department of Pathology, University Health Network, and Ontario Cancer Institute, Toronto, Ontario, Canada. briesy@gmx.de
authors.forename: Juliane
authors.initials: J
authors.lastname: Briese
authors.forename: Sonia
authors.initials: S
authors.lastname: Cheng
authors.forename: Shereen
authors.initials: S
authors.lastname: Ezzat
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Daniel
authors.initials: D
authors.lastname: Winer
authors.forename: Christoph
authors.initials: C
authors.lastname: Wagener
authors.forename: Ana-Maria
authors.initials: AM
authors.lastname: Bamberger
authors.forename: Sylvia L
authors.initials: SL
authors.lastname: Asa
mesh_terms: D015703:Antigens, CD / Q000096:biosynthesis; D002272:Carcinoembryonic Antigen / Q000096:biosynthesis; D002277:Carcinoma / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000096:biosynthesis; D005260:Female; D005786:Gene Expression Regulation; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D015233:Models, Statistical; D009362:Neoplasm Metastasis; D053495:Osteopontin / Q000096:biosynthesis*; D013961:Thyroid Gland / Q000378:metabolism; D013964:Thyroid Neoplasms / Q000378:metabolism*
chemical_list: D015703:Antigens, CD; C069847:CD66 antigens; D002272:Carcinoembryonic Antigen; D015815:Cell Adhesion Molecules; D053495:Osteopontin