title: Microsatellite instability analysis of sinonasal carcinomas.
abstract: OBJECTIVE
  Intestinal-type sinonasal adenocarcinoma (ITAC) and squamous cell carcinoma of the nasal cavity (SCCNC) are histopathologically but not etiologically similar to colorectal adenocarcinoma or to laryngeal squamous cell carcinoma, respectively. Microsatellite instability (MSI) is involved in both tumors. The aim of this study was to investigate a possible role for MSI in the pathogenesis of two types of nasal carcinoma.
  
  
  METHODS
  DNA obtained from frozen tumor samples of 41 ITACs and 24 SCCNCs was analyzed for shifts in five mononucleotide microsatellite loci by multiplex PCR.
  
  
  RESULTS
  The allelic patterns of one ITAC (2%) and five SCCNCs (21%) revealed an allelic shift for at least one of the five loci, indicating microsatellite instability.
  
  
  CONCLUSIONS
  MSI may be involved in squamous cell carcinoma, but not in adenocarcinoma of the nasal cavities.
authors.affiliation: Department of Otorhinolaryngology, IUOPA, Hospital Universitario Central de Asturias, Oviedo, Asturias, Spain.
authors.forename: Jorge García
authors.initials: JG
authors.lastname: Martínez
authors.forename: Jhudit
authors.initials: J
authors.lastname: Pérez-Escuredo
authors.forename: Fernando
authors.initials: F
authors.lastname: López
authors.forename: Carlos
authors.initials: C
authors.lastname: Suárez
authors.forename: César
authors.initials: C
authors.lastname: Alvarez-Marcos
authors.forename: José Luis
authors.initials: JL
authors.lastname: Llorente
authors.forename: Mario A
authors.initials: MA
authors.lastname: Hermsen
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics*; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D053842:Microsatellite Instability; D008875:Middle Aged; D009669:Nose Neoplasms / Q000235:genetics*; D016133:Polymerase Chain Reaction