title: Myeloperoxydase activity in the pathogenesis of cholesteatoma.
abstract: OBJECTIVE
  The aim of this study was to determine the effect of myeloperoxydase (MPO) in bone destruction in patients of chronic otitis media (COM) with cholesteatoma by immtino-histochemical staining and to conclude the possible relationship between bone destruction in patients with cholesteatoma accompanied with COM and MPO activity.
  
  
  METHODS
  The study was conducted on a total number of 81 patients where 51 of the patients were enrolled in the "patient group" and 30 of the patients were enrolled in the "control group" whom were operated due to otitis media. MPO positivism was monitored when a cytoplasmic staining process was performed.
  
  
  RESULTS
  Meanwhile, a significant difference is present at a statistically advanced level between the MPO levels of groups (p = 0.001; p < 0.01). However, MPO activity is absent in patients included in the control group or it can be observed at a very slight level. A moderate level or intense level of activity can be observed in patients enrolled in the study group. Excluding the destruction at the dura, all findings related with the middle ear and the erosion of the mastoid cavity and MPO activity indicated a statistically significant difference (p < 0.05). According to the destruction at the wall of the dura bone, distribution of MPO activity did not display a statistically meaningful difference (p > 0.05).
  
  
  CONCLUSIONS
  In this study, we investigated the relationship between MPO level and bone destruction and found a significant level of correlation among the fore said. A new era may be opened in the treatment of cholesteatoma when preoperative MPO levels are determined and adequate information is obtained related with bone erosion.
authors.affiliation: Rize Government Hospital, Rize, Turkey.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Celebi
authors.forename: Mustafa
authors.initials: M
authors.lastname: Paksoy
authors.forename: Sedat
authors.initials: S
authors.lastname: Aydin
authors.forename: Arif
authors.initials: A
authors.lastname: Sanlı
authors.forename: Omer
authors.initials: O
authors.lastname: Taşdemir
authors.forename: Aylin Ege
authors.initials: AE
authors.lastname: Gül
keywords: Cholesteatoma; Chronic otitis media; Myeloperoxydase