title: The prognostic significance of epithelial-mesenchymal transition in breast cancer.
abstract: BACKGROUND
  This study investigates the influence of epithelial-mesenchymal transition on prognosis in breast cancer.
  
  
  METHODS
  Eighty breast carcinomas as well as 6 breast cancer cell lines were analysed immunohistochemically for the expression of epithelial keratins (K) K8, K19 and mesenchymal vimentin. Protein expression was correlated with histopathological factors and clinical follow-up.
  
  
  RESULTS
  Suppression of K8 and K19 occurred in the majority of the tumours (72.5% and 65%), while aberrant expression of vimentin was found in 21.2% of the tumours. Suppression of K8 as well as expression of vimentin was significantly correlated with short survival (p < 0.004 and p < 0.006). Moreover HER2 overexpression significantly correlated with K19 (p < 0.0004) and vimentin (p < 0.0005). In cell lines with increasing invasive potential, epithelial keratins were lost in favour of mesenchymal vimentin.
  
  
  CONCLUSIONS
  The transition from epithelial keratin to mesenchymal vimentin expression marks an important step in the malignant progression of breast cancer.
authors.affiliation: Department of Gynecology, Charité Campus Virchow-Clinic, Berlin, Germany. ilka.fuchs@charite.de
authors.forename: Ilka B
authors.initials: IB
authors.lastname: Fuchs
authors.forename: Werner
authors.initials: W
authors.lastname: Lichtenegger
authors.forename: Helmut
authors.initials: H
authors.lastname: Buehler
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Henrich
authors.forename: Harald
authors.initials: H
authors.lastname: Stein
authors.forename: Anke
authors.initials: A
authors.lastname: Kleine-Tebbe
authors.forename: Gerhard
authors.initials: G
authors.lastname: Schaller
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D018270:Carcinoma, Ductal, Breast / Q000378:metabolism / Q000473:pathology*; D004847:Epithelial Cells / Q000378:metabolism / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D053533:Keratin-8; D007633:Keratins / Q000096:biosynthesis; D008648:Mesoderm / Q000378:metabolism / Q000473:pathology; D008875:Middle Aged; D011379:Prognosis; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000096:biosynthesis; D011960:Receptors, Estrogen / Q000096:biosynthesis; D015996:Survival Rate; D014407:Tumor Cells, Cultured; D014746:Vimentin / Q000096:biosynthesis
chemical_list: D053533:Keratin-8; D007633:Keratins; D018719:Erb-b2 Receptor Tyrosine Kinases; D011960:Receptors, Estrogen; D014746:Vimentin; C426203:KRT8 protein, human