title: Expression of mdm2 and p53 in epithelial neoplasms of the colorectum.
abstract: OBJECTIVE
  To evaluate the respective roles of mdm2 (murine double minute 2) and p53 in the development of colorectal carcinoma.
  
  
  METHODS
  Formalin fixed, paraffin wax embedded tissues from 72 sporadic adenomas and 55 carcinomas were investigated by means of immunohistochemistry for mdm2 and p53.
  
  
  RESULTS
  mdm2 was expressed weakly in 17 of 72 (23.6%) adenomas and in 14 of 55 (25.4%) carcinomas. p53 was expressed in 19 of 72 (26.4%) adenomas and in 23 of 55 (41.8%) carcinomas. Four adenomas and five carcinomas showed positive staining for both proteins. Overexpression of p53 in adenomas was associated with moderate and severe dysplasia but not with tumour size. No associations were found between the expression of mdm2 and either the degree of dysplasia or tumour size. In carcinomas, neither the expression of p53 nor mdm2 correlated with Dukes's stage, metastasis, or differentiation. No associations were found between the expression of p53 and mdm2 in either adenomas or carcinomas.
  
  
  CONCLUSIONS
  Although mdm2 has been reported to be an oncogene, it does not appear to play a major role in the development of colorectal carcinoma.
authors.affiliation: Academic Department of Pathology, Northwick Park and St Mark's NHS Trust, Harrow, UK.
authors.forename: X P
authors.initials: XP
authors.lastname: Hao
authors.forename: T
authors.initials: T
authors.lastname: Günther
authors.forename: A
authors.initials: A
authors.lastname: Roessner
authors.forename: A B
authors.initials: AB
authors.lastname: Price
authors.forename: I C
authors.initials: IC
authors.lastname: Talbot
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology; D000236:Adenoma / Q000378:metabolism / Q000473:pathology; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology; D018450:Disease Progression; D006801:Humans; D007124:Immunoenzyme Techniques; D009363:Neoplasm Proteins / Q000378:metabolism*; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051736:Proto-Oncogene Proteins c-mdm2; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; D016159:Tumor Suppressor Protein p53; C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2