title: A predictive model of survival after radical cystectomy for carcinoma of the bladder.
abstract: OBJECTIVE
  To evaluate the effect of patient and tumour characteristics on the disease-free survival after radical cystectomy for infiltrating bladder cancer, and to use these to help in constructing a meaningful prognostic index.
  
  
  METHODS
  The disease-free survival was initially evaluated in 1026 patients (the reference series, 1969-1990). A multivariate analysis showed that the tumour P stage, grade and nodal involvement were the only factors which had an independent and significant association with survival. The computed regression coefficients were then used to classify patients into one of four risk categories and the results then validated by applying the model to a prospective test series (1991-1995).
  
  
  RESULTS
  The 5-year disease-free survival of both groups was similar. When the results for the risk categories of the reference series were compared with those of the test series, there was no significant difference.
  
  
  CONCLUSIONS
  This comprehensive prognostic model for the results of radical cystectomy was validated and verified in a prospective group of patients. Adjuvant therapies are indicated for patients with a high risk score.
authors.affiliation: Urology and Nephrology Center, Mansoura and the Department of Biostatistics, National Cancer Institute of Cairo University, Egypt.
authors.forename: M A
authors.initials: MA
authors.lastname: Ghoneim
authors.forename: M M
authors.initials: MM
authors.lastname: El-Mekresh
authors.forename: A A
authors.initials: AA
authors.lastname: Mokhtar
authors.forename: M A
authors.initials: MA
authors.lastname: Gomha
authors.forename: M A
authors.initials: MA
authors.lastname: El-Baz
authors.forename: I A
authors.initials: IA
authors.lastname: El-Attar
mesh_terms: D000328:Adult; D000368:Aged; D015653:Cystectomy / Q000379:methods* / Q000401:mortality; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011379:Prognosis; D011446:Prospective Studies; D012307:Risk Factors; D001749:Urinary Bladder Neoplasms / Q000601:surgery*