title: Significance of CDKN2A gene A148T variant in patients with bladder cancer.
abstract: OBJECTIVE
  The A148T polymorphism of CDKN2A gene is observed in various neoplasms with the incidence rate of 3-35%, however, rather little is known either about the frequency of its occurrence or of its significance in urinary bladder carcinoma.
  
  
  METHODS
  DNA was isolated from blood of 156 patients with urinary bladder carcinoma (130 men). In histopathology, 84 cases were classified as G1, 42 as G2, and 30 as G3. The clinical stage was in 81 cases estimated at Ta and in 75 cases at T1-T4. A148T polymorphism was detected by the MSSCP technique and by sequencing.
  
  
  RESULTS
  A148T polymorphism was identified in 9/156 urinary bladder carcinoma cases (only in men). The obtained results were compared with the polymorphism incidence for the Polish population, estimated by Debniak et al. The occurrence in the group of the bladder cancer patients turned out higher (5.77%) from that in the control group (2.89%) (G test, table 2×2: NBLADDER CANCER = 156, NCONTROL = 1210, G = 4.298, p <0.05).
  
  
  CONCLUSIONS
  Summing up and taking into account the analysis of clinical parameters and the age of the disease occurrence, the A148T polymorphism of CDKN2A gene was identified in the study group only in men, in whom the disease was diagnosed above the age of 60, while the diagnosed neoplasms were in the majority of cases characterized by higher clinical stages and higher grades of malignancy. This has been the first study that attempted to show a potential association between A148T alterations and an increased risk for bladder cancer development.
authors.affiliation: Chair of Clinical and Laboratory Genetics, Medical University of Łódź, Poland.
authors.forename: Edyta
authors.initials: E
authors.lastname: Borkowska
authors.affiliation: Department of Urology, John Paul II Regional Hospital in Bełchatów, Poland.
authors.forename: Adam
authors.initials: A
authors.lastname: Jędrzejczyk
authors.affiliation: Department of Ecology and Vertebrate Zoology, University of Łódź, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Kruk
authors.affiliation: Chair of Clinical and Laboratory Genetics, Medical University of Łódź, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Pietrusiński
authors.affiliation: Chair of Clinical and Laboratory Genetics, Medical University of Łódź, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Traczyk
authors.affiliation: The Clinic of Urology at the "Lekarze Urolodzy Rożniecki i Partnerzy" Non-Public Health Unit in Łask, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Rożniecki
authors.affiliation: Chair of Clinical and Laboratory Genetics, Medical University of Łódź, Poland.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Kałużewski
keywords: CDKN2A, A148T polymorphism; bladder cancer