title: QPRT: a potential marker for follicular thyroid carcinoma including minimal invasive variant; a gene expression, RNA and immunohistochemical study.
abstract: BACKGROUND
  The differential diagnosis between follicular thyroid adenoma and minimal invasive follicular thyroid carcinoma is often difficult for several reasons. One major aspect is the lack of typical cytological criteria in well differentiated specimens. New marker molecules, shown by poly- or monoclonal antibodies proved helpful.
  
  
  METHODS
  We performed global gene expression analysis of 12 follicular thyroid tumours (4 follicular adenomas, 4 minimal invasive follicular carcinomas and 4 widely invasive follicular carcinomas), followed by immunohistochemical staining of 149 cases. The specificity of the antibody was validated by western blot analysis
  
  
  RESULTS
  In gene expression analysis QPRT was detected as differently expressed between follicular thyroid adenoma and follicular thyroid carcinoma. QPRT protein could be detected by immunohistochemistry in 65% of follicular thyroid carcinomas including minimal invasive variant and only 22% of follicular adenomas.
  
  
  CONCLUSIONS
  Consequently, QPRT is a potential new marker for the immunohistochemical screening of follicular thyroid nodules.
authors.affiliation: Senckenbergisches Institut für Pathologie, Klinikum der Johann Wolfgang Goethe-Universität Frankfurt am Main, Frankfurt, Germany. n.hinsch@em.uni-frankfurt.de
authors.forename: Nora
authors.initials: N
authors.lastname: Hinsch
authors.forename: Matthias
authors.initials: M
authors.lastname: Frank
authors.forename: Claudia
authors.initials: C
authors.lastname: Döring
authors.forename: Christian
authors.initials: C
authors.lastname: Vorländer
authors.forename: Martin-Leo
authors.initials: ML
authors.lastname: Hansmann