title: [Detection of TP53-mutations in brush biopsies from oral leukoplakias].
abstract: OBJECTIVE
  The aim of this study was to determine the prevalence of mutations of the tumour suppressor gene TP53 in oral leukoplakias.
  
  
  METHODS
  Brush biopsy specimens of 43 oral leukoplakias, 26 oral squamous cell carcinomas (OSCC) for reference, and the oral mucosa of 4 clinically normal volunteers were collected. DNA of the critical exons 5-8 was analysed by temperature gradient gel electrophoresis (TGGE).
  
  
  RESULTS
  The prevalence of mutations was 57.7% in OSCC, 39.5% in leukoplakias and 0% in controls. The highest frequency of mutations was found in exon 5 (46.2%) in OSCC and in exon 6 (23.3%) in leukoplakia. More than one mutation was detected in 26.9% of OSCC and 7% of leukoplakia specimens. At least one mutation was found in 37.5% of T1 OSCC and 100% of T4 OSCC specimens and in 37.1% of the L1 leukoplakia and 100% of L3 leukoplakia specimens.
  
  
  CONCLUSIONS
  TP53 mutations could be a useful prognostic indicator in precancerous oral lesions. Although the brush biopsy technique appears simple clinically, further investigations are necessary to specify the implications of genetic analysis.
authors.affiliation: Abteilung für Oralchirurgie und zahnärztliche Röntgenologie, Zentrum für Zahnmedizin, Universitätsklinikum Charité der Humboldt-Universität, Augustenburger Platz 1, 13353 Berlin, christian.scheifele@charite.de
authors.forename: C
authors.initials: C
authors.lastname: Scheifele
authors.forename: H
authors.initials: H
authors.lastname: Schlechte
authors.forename: G
authors.initials: G
authors.lastname: Bethke
authors.forename: P A
authors.initials: PA
authors.lastname: Reichart
mesh_terms: D001706:Biopsy; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000473:pathology; D002872:Chromosome Deletion; D004252:DNA Mutational Analysis; D005091:Exons; D005260:Female; D016158:Genes, p53 / Q000235:genetics*; D006801:Humans; D007972:Leukoplakia, Oral / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000473:pathology*; D009062:Mouth Neoplasms / Q000235:genetics* / Q000473:pathology; D009367:Neoplasm Staging; D011230:Precancerous Conditions / Q000235:genetics* / Q000473:pathology