title: Analysis of Ki-67 immunoreactivity in recurring and nonrecurring nasal polyps.
abstract: OBJECTIVE
  Nasal polyps are common, abnormal lesions. Recurrence of the nasal polyposis is prevalent and a severe problem. The aim of this study was to investigate the relationship between Ki-67 immunoreactivity and the risk of recurrence of nasal polyps. Ki-67 staining of polypectomy material was tested as a risk factor for recurrence independent of etiologic factors or treatment modalities.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  Ki-67 immunoreactivity.
  
  
  METHODS
  Pathologic specimens from patients with nonrecurrent and recurrent nasal polyps archived at the Department of Pathology were reviewed, and the most suitable blocks were chosen among the excision materials. Ki-67 antibody staining was investigated immunohistochemically using the avidin-biotin-peroxidase method. The percentages of nuclei immunostained for Ki-67 of at least 1000 epithelial cells in the most intensive staining areas at final magnification (x400) were calculated and defined as the labeling index. The Mann-Whitney U-test was used to compare the Ki-67 labeling index in the nonrecurring and recurring nasal polyp groups.
  
  
  RESULTS
  The mean Ki-67 labeling index was 1.4 +/- 1.972 (range 1-87 in 1000 epithelial cells) in the nonrecurrent nasal polyp group and 17.8 +/- 5.67 (range 82-446 in 1000 epithelial cells) in the recurrent nasal polyp group; the difference between the nonrecurrent and the recurrent group was significant (p < .01).
  
  
  CONCLUSIONS
  The results of this study clearly demonstrate that proliferative activity in the surface epithelial cells of recurring nasal polyps is significantly higher than that in nonrecurring nasal polyps.
authors.affiliation: Department of Pathology, Yüzüncü Yil University Faculty of Medicine, Van, Turkey. mustafakosem@yyu.edu.tr
authors.forename: Mustafa
authors.initials: M
authors.lastname: Kösem
authors.forename: Gülay
authors.initials: G
authors.lastname: Bulut
authors.forename: Zülküf
authors.initials: Z
authors.lastname: Kaya
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D009298:Nasal Polyps / Q000276:immunology* / Q000378:metabolism / Q000601:surgery; D013517:Otorhinolaryngologic Surgical Procedures / Q000379:methods*; D011379:Prognosis; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D055815:Young Adult
chemical_list: D019394:Ki-67 Antigen