title: Telomerase activity in urine after transurethral resection of superficial bladder cancer and early recurrence.
abstract: BACKGROUND
  To explore the relationship between telomerase activity in urine after transurethral resection (TUR) of superficial bladder cancer and early intravesical recurrence.
  
  
  METHODS
  Urine samples were obtained from 42 patients with superficial bladder cancers prior to TUR and on the postoperative day 1 and day 6. These patients were followed-up prospectively by cystoscopy at 3 and 6 months after TUR in combination with urinary cytology and telomerase activity. Telomerase activity in the urine was assessed by the telomeric repeat amplification protocol assay.
  
  
  RESULTS
  Urinary telomerase activity prior to TUR was positive in 24 (57%) of the 42 patients. On the postoperative day 1 and day 6, positive urinary telomerase activity was seen in 13 (31%) and nine (21%) patients, respectively. Postoperative urinary telomerase activity on either day 1 or day 6 was significantly associated with pre-operative urinary telomerase activity status (P = 0.0024). Fifteen patients showed intravesical tumor recurrence at 3 months cystoscopic check-up and an additional nine had recurred at the 6 months check-up. Recurrence rate within 6 months in patients with pre-operative positive urinary telomerase activity was similar to that in those with negative activity (58.3 vs 58.8%). However, recurrence rate at 3 months for patients with positive activity was higher than that of those with negative activity (50 vs 17.7%), in 23 patients treated only by TUR.
  
  
  CONCLUSIONS
  Presence of cells positive for telomerase activity in urine after TUR of superficial bladder cancer indicates persistently existing cancer cells in the urine. It is, however, not a sole predictor of the early intravesical recurrence.
authors.affiliation: Department of Urology, Faculty of Medicine, Kyoto University, Japan.
authors.forename: X X
authors.initials: XX
authors.lastname: Wu
authors.forename: Y
authors.initials: Y
authors.lastname: Kakehi
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Habuchi
authors.forename: O
authors.initials: O
authors.lastname: Ogawa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D019098:Telomerase / Q000652:urine*; D001749:Urinary Bladder Neoplasms / Q000473:pathology / Q000601:surgery / Q000652:urine
chemical_list: D019098:Telomerase