title: Use of cytological specimens for p53 gene alteration detection in oral squamous cell carcinoma risk patients.
abstract: OBJECTIVE
  Recurrence and multifocal nature are two important characteristics of oral squamous cell carcinoma. Leukoplakia is the most frequent pre-cancerous oral lesion and, in most cases, it is not possible to predict malignant capacity. The objective of this study is to identify p53 alterations in cells taken from the oral cavity of at-risk patients.
  
  
  METHODS
  The following samples were collected from 34 patients with oral leukoplakia with and without previous carcinoma: oral rinse, a brush swabbed over the lesions and hair roots. Mutational analysis of the p53 gene was performed by single-strand conformation polymorphisms and confirmed by DNA sequencing.
  
  
  RESULTS
  We detected 11 mutations in p53 gene in oral cytological specimens. These alterations were observed only in brush cytology samples in patients without previous carcinoma, and in both samples (rinse and brush) in patients with previous carcinoma. Three of these patients had disease recurrence.
  
  
  CONCLUSIONS
  This non-invasive technique may be useful in the follow-up of at-risk patients, and introduces new possibilities to analyse molecular markers before malignant lesions are clinically apparent.
authors.affiliation: Buccal Medicine, Department of Stomatology, Faculty of Medicine and Odontology, University of the Basque Country EHU, Leioa, Spain.
authors.forename: M
authors.initials: M
authors.lastname: López
authors.forename: J M
authors.initials: JM
authors.lastname: Aguirre
authors.forename: N
authors.initials: N
authors.lastname: Cuevas
authors.forename: M
authors.initials: M
authors.lastname: Anzola
authors.forename: J
authors.initials: J
authors.lastname: Videgain
authors.forename: J
authors.initials: J
authors.lastname: Aguirregaviria
authors.forename: A
authors.initials: A
authors.lastname: Castro
authors.forename: M Martínez
authors.initials: MM
authors.lastname: de Pancorbo
mesh_terms: D000328:Adult; D000368:Aged; D001483:Base Sequence; D014408:Biomarkers, Tumor / Q000235:genetics*; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D004252:DNA Mutational Analysis; D005260:Female; D006801:Humans; D007972:Leukoplakia, Oral / Q000235:genetics; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics*; D009154:Mutation; D009364:Neoplasm Recurrence, Local; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D012307:Risk Factors; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
chemical_list: D014408:Biomarkers, Tumor; D016159:Tumor Suppressor Protein p53