title: Expression of the cyclin-dependent kinase inhibitor p27 in transitional cell bladder cancers: is it a good predictor for tumor behavior?
abstract: OBJECTIVE
  Progression of the cell cycle is regulated by the interactions of cyclins, cyclin dependent kinases (CDKs) and CDK inhibitors (CDKIs). p27 is a member of the universal cyclin-dependent kinase inhibitor family. The level of p27 protein expression decreases during tumor development and progression in some epithelial, lymphoid and endocrine tissues. It has been suggested that p27 is an independent prognostic factor in various human cancers. The prognostic value of p27 protein expression is not completely understood in bladder cancer yet.
  
  
  OBJECTIVE
  To investigate the immunohistochemical expression of p27 in transitional cell bladder cancers and its relationship with clinicopathological data, proliferating cell nuclear antigen (PCNA) and p53 oncoprotein immunoreactivity.
  
  
  METHODS
  The expression of p27 protein was immunohistochemically analyzed in paraffin-embedded specimens of 75 patients with transitional cell carcinoma of the bladder. p27 expression was compared with tumor grade, stage, growth pattern, disease-free survival, progression, PCNA and p53 immunoreactivity.
  
  
  RESULTS
  Expression of p27 was not significantly related to clinicopathologic parameters, disease-free survival, progression, PCNA and p53 immunoreactivity.
  
  
  CONCLUSIONS
  The results indicate that p27 is not a good predictor for outcome of transitional cell carcinoma of the bladder.
authors.affiliation: Department of Pathology, Trakya University Medical Faculty, Edirne, Turkey. lcdoganay@hotmail.com
authors.forename: Latife
authors.initials: L
authors.lastname: Doganay
authors.forename: Semsi
authors.initials: S
authors.lastname: Altaner
authors.forename: Selcuk
authors.initials: S
authors.lastname: Bilgi
authors.forename: Esat
authors.initials: E
authors.lastname: Kaya
authors.forename: Galip
authors.initials: G
authors.lastname: Ekuklu
authors.forename: Kemal
authors.initials: K
authors.lastname: Kutlu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002295:Carcinoma, Transitional Cell / Q000737:chemistry / Q000201:enzymology* / Q000473:pathology; D018797:Cell Cycle Proteins / Q000096:biosynthesis*; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases / Q000037:antagonists & inhibitors*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D016159:Tumor Suppressor Protein p53 / Q000032:analysis; D025521:Tumor Suppressor Proteins / Q000096:biosynthesis*; D001749:Urinary Bladder Neoplasms / Q000737:chemistry / Q000201:enzymology* / Q000473:pathology
chemical_list: D018797:Cell Cycle Proteins; D018809:Proliferating Cell Nuclear Antigen; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases