title: Clinicopathological significance of p53 and p21 expression in the surgical treatment of laryngeal carcinoma.
abstract: BACKGROUND
  This study aimed at resolving the clinicopathological significance of p53 and p21 expression in patients undergoing surgical treatment for laryngeal carcinoma.
  
  
  METHODS
  p53 and p21 expression were studied by immunohistochemical method on surgical specimens of 193 patients. The expressions of p53 and p21 were correlated with the clinicopathological data.
  
  
  RESULTS
  Of the 193 tumors, 60% had positive p53 expression and 46% had positive p21 expression. Nodal metastasis was significantly correlated with p53 overexpression, supraglottic involvement and moderate- to poor-differentiation of the tumor. There was significant cumulative effect with increasing risk of nodal metastasis with increasing number of risk factors: 0% without any risk factor, 13% with 1 risk factor, 37% with 2 risk factors and 55% with all 3 risk factors.
  
  
  CONCLUSIONS
  Positive expressions p53 and p21 were common in laryngeal carcinoma. Overexpression of p53 but not p21 was associated with nodal metastasis. The use of p53 expression has added value in providing more accurate prognostic analysis of risk of nodal metastasis in conjunction with site of tumor involvement and tumor grade.
authors.affiliation: Division of Otorhinolaryngology, Department of Surgery, University of Hong Kong, Hong Kong, SAR, PR China. pwyuen@hkucc.hku.hk
authors.forename: P W
authors.initials: PW
authors.lastname: Yuen
authors.forename: K Y
authors.initials: KY
authors.lastname: Lam
authors.forename: J T
authors.initials: JT
authors.lastname: Choy
authors.forename: W K
authors.initials: WK
authors.lastname: Ho
authors.forename: W I
authors.initials: WI
authors.lastname: Wei
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis*; D002294:Carcinoma, Squamous Cell / Q000473:pathology* / Q000601:surgery*; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000032:analysis*; D004791:Enzyme Inhibitors / Q000032:analysis; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007822:Laryngeal Neoplasms / Q000473:pathology* / Q000601:surgery*; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D016159:Tumor Suppressor Protein p53 / Q000032:analysis*
chemical_list: D014408:Biomarkers, Tumor; C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D004791:Enzyme Inhibitors; D016159:Tumor Suppressor Protein p53