title: Micronucleus frequency in acquired middle ear cholesteatoma.
abstract: OBJECTIVE
  To determine the micronucleus (MN) frequency of acquired cholesteatoma tissue using an MN assay.
  
  
  METHODS
  Eighteen patients were diagnosed as having chronic otitis media with acquired cholesteatoma and were divided into primary and secondary acquired cholesteatoma groups. Cholesteatoma tissue and normal tissue specimens from the external ear canal skin were taken from the patients during surgical operations. MN frequencies of cholesteatoma and control samples were determined according to standard criteria.
  
  
  RESULTS
  The MN frequencies of the cholesteatoma and control tissues were 0.54%+/-0.31% and 0.24%+/-0.11%, respectively (p<0.01). MN frequencies for the primary and secondary acquired cholesteatoma groups were 0.63%+/-0.36% and 0.46%+/-0.26%, respectively (p>0.05). MN frequencies in cholesteatoma patients without and with complications were 0.42%+/-0.19% and 0.85%+/-0.37%, respectively (p<0.05).
  
  
  CONCLUSIONS
  MN frequencies were found to be increased in cholesteatoma tissues when compared with external ear canal skin. The MN frequency in five cases with complications was higher than in cases without complications. These results indicate that there could be associations between MN frequency and acquired cholesteatoma and between MN frequency and complications.
authors.affiliation: Department of Otolaryngology, Meram Medical Faculty, Selçuk University, Konya, Turkey. kayhan@medscape.com
authors.forename: Kayhan
authors.initials: K
authors.lastname: Oztürk
authors.forename: M Selman
authors.initials: MS
authors.lastname: Yildirim
authors.forename: Hasan
authors.initials: H
authors.lastname: Acar
authors.forename: Hilal
authors.initials: H
authors.lastname: Arikoğlu
authors.forename: Hamdi
authors.initials: H
authors.lastname: Arbağ
authors.forename: Bedri
authors.initials: B
authors.lastname: Ozer
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D018424:Cholesteatoma, Middle Ear / Q000473:pathology* / Q000601:surgery; D004432:Ear, Middle / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D048629:Micronuclei, Chromosome-Defective / Q000706:statistics & numerical data*; D015162:Micronucleus Tests / Q000379:methods; D008875:Middle Aged; D012867:Skin / Q000473:pathology