title: Cytokeratin 8/18 expression indicates a poor prognosis in squamous cell carcinomas of the oral cavity.
abstract: BACKGROUND
  Intermediary filaments are involved in cell motility and cancer progression. In a variety of organs, the expression of distinct intermediary filaments are associated with patient prognosis. In this study, we seeked to define the prognostic potential of cytokeratin and vimentin expression patterns in squamous cell carcinomas (SCC's) of the oral cavity.
  
  
  METHODS
  308 patients with histologically proven and surgically treated squamous cell carcinomas of the oral cavity were investigated for the immunohistochemical expression of a variety of intermediary filaments including high- and low-molecular weight cytokeratins (Ck's), such as Ck 5/6, Ck 8/18, Ck 1, CK 10, Ck 14, Ck 19 and vimentin, using the tissue microarray technique. Correlations between clinical features and the expression of Cytokeratins and vimentin were evaluated statistically by Kaplan-Meier curves and multivariate Cox regression analysis.
  
  
  RESULTS
  The expression of Ck 8/18 and Ck 19 were overall significantly correlated with a poor clinical prognosis (Ck 8/18 p = 0.04; Ck19 p < 0.01). These findings could also be reproduced for Ck 8/18 in primary nodal-negative SCC's and held true in multivariate-analysis. No significant correlation with patient prognosis could be found for the expression of the other cytokeratins and for vimentin.
  
  
  CONCLUSIONS
  The expression of Ck 8/18 in SCC's of the oral cavity is an independent prognostic marker and indicates a decreased overall and progression free survival. These results provide an extended knowledge about the role of intermediary filament expression patterns in SCC's.
authors.affiliation: Department of Cranio-Maxillofacial Surgery, University of Muenster, Waldeyerstrasse 30, 48129 Muenster, Germany. fillies@uni-muenster.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Fillies
authors.forename: Richard
authors.initials: R
authors.lastname: Werkmeister
authors.forename: Jens
authors.initials: J
authors.lastname: Packeisen
authors.forename: Burkhard
authors.initials: B
authors.lastname: Brandt
authors.forename: Philippe
authors.initials: P
authors.lastname: Morin
authors.forename: Dieter
authors.initials: D
authors.lastname: Weingart
authors.forename: Ulrich
authors.initials: U
authors.lastname: Joos
authors.forename: Horst
authors.initials: H
authors.lastname: Buerger
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000473:pathology*; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D007150:Immunohistochemistry; D007633:Keratins / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics* / Q000473:pathology*; D011379:Prognosis; D016019:Survival Analysis
chemical_list: D014408:Biomarkers, Tumor; D007633:Keratins