title: Expression of syndecan-1 in papillary carcinoma of the thyroid with extracapsular invasion.
abstract: OBJECTIVE
  Syndecan-1 (SDC-1) is a member of the family of transmembrane heparan sulfate proteoglycans, which are involved in cell-cell adhesion and the interaction of cells with the extracellular matrix. Evidence suggests that loss of SDC-1 expression in several benign and malignant epithelial neoplasms is an unfavorable prognostic indicator, but its expression profile in thyroid gland neoplasms remains to be elucidated. The aim of this study was to evaluate SDC-1 expression in papillary carcinomas of the thyroid (PCT) that were both larger and smaller (papillary microcarcinoma) than 10mm, with or without extracapsular extension (PCT-E and PCT-NE).
  
  
  METHODS
  The expression of SDC-1 was studied in 62 cases of PCT-E and PCT-NE using a tissue microarrays technique (TMA). SDC-1 positivity was predominantly observed in the cytoplasm of neoplastic epithelial cells and in the stroma of PCT.
  
  
  RESULTS
  SDC-1 is expressed in both neoplastic epithelial cells and the stroma. It is more frequently expressed in PCT-E than PCT-NE (p=0.002) and the stromal expression of SDC-1 is more intense in PCT-E that are >10 mm (p=0.026).
  
  
  CONCLUSIONS
  The epithelial and stromal expression of SDC-1 observed in this series of PCT suggests that the expression of this protein may be related to extracapsular invasion.
authors.affiliation: Instituto de Investigación en Odontología, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Jalisco, Mexico. rbologna@correo.xoc.uam.mx
authors.forename: Ronell
authors.initials: R
authors.lastname: Bologna-Molina
authors.forename: Rogelio
authors.initials: R
authors.lastname: González-González
authors.forename: Adalberto
authors.initials: A
authors.lastname: Mosqueda-Taylor
authors.forename: Nelly
authors.initials: N
authors.lastname: Molina-Frechero
authors.forename: Pablo
authors.initials: P
authors.lastname: Damián-Matsumura
authors.forename: Hugo
authors.initials: H
authors.lastname: Dominguez-Malagón
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002291:Carcinoma, Papillary / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D053668:Syndecan-1 / Q000378:metabolism*; D013964:Thyroid Neoplasms / Q000378:metabolism* / Q000473:pathology; D055815:Young Adult
chemical_list: D053668:Syndecan-1