title: Image cytometric analysis of p53 and mdm-2 expression in primary and recurrent mucoepidermoid carcinoma of parotid gland: immunohistochemical study.
abstract: OBJECTIVE
  This study aims to analyze immunocytochemically p53 aberrant expression and mdm-2 expression in primary and recurrent mucoepidermoid carcinoma (MEC) of parotid gland and to ascertain if expression of these markers correlates with tumor behavior, clinical outcome, histological grade and local recurrence.
  
  
  METHODS
  20 cases histologically diagnosed as primary MEC with different grades were included in the study. Out of 20 cases, 7 were classified as grade I, 8 as grade II and 5 as grade III. Immunohistochemical staining of these 20 primary cases as well as 6 recurrent cases with anti-p53 and anti-mdm-2 antibodies was carried out. Area fraction of immunopositivity was estimated by image analysis software.
  
  
  RESULTS
  16/20 primary cases were p53 +ve (80%). The p53 positive cases included 3 cases classified as grade (I), 8 cases as grade (II) and 5 cases as grade (III). All 6 recurrent cases were p53 +ve. On the other hand, 14/20 primary and only 2/6 recurrent cases were mdm-2 +ve. The mdm-2 +ve primary cases included 2 classified as grade (I), 7 as grade (II) and 5 as grade (III). 12 primary MEC showed co-expression of both p53 and mdm-2 of which 2 cases showed local recurrence.
  
  
  CONCLUSIONS
  These data suggested that expression of p53 and mdm-2 in primary and recurrent MEC correlates with the high histological grade. P53 aberrant expression is not only considered as an early event in MEC carcinogenesis but also correlates to tumor behavior and local recurrence. Mdm-2 overexpression is correlated to pathogenesis of MEC. However, no strong evidence was found between mdm-2 expression and MEC local recurrence.
authors.affiliation: Associate Professor, Oral Pathology Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt. ihabema2003@yahoo.com
authors.forename: Ehab S
authors.initials: ES
authors.lastname: Abd-Elhamid
authors.forename: Mohamed H
authors.initials: MH
authors.lastname: Elmalahy
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D014408:Biomarkers, Tumor / Q000032:analysis*; D018277:Carcinoma, Mucoepidermoid / Q000737:chemistry* / Q000401:mortality / Q000556:secondary / Q000601:surgery; D002648:Child; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009367:Neoplasm Staging; D010307:Parotid Neoplasms / Q000737:chemistry* / Q000401:mortality / Q000473:pathology / Q000601:surgery; D051736:Proto-Oncogene Proteins c-mdm2 / Q000032:analysis*; D013997:Time Factors; D016896:Treatment Outcome; D016159:Tumor Suppressor Protein p53 / Q000032:analysis*; D055815:Young Adult
chemical_list: D014408:Biomarkers, Tumor; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53; C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2