title: [Influence of sex differences in biological aggressivity of bladder urothelial tumor at first diagnosis].
abstract: BACKGROUND
  To investigate whether, in the same way incidence is affected, biological aggressiveness of bladder cancer at diagnosis is greater in men than in women.
  
  
  METHODS
  Using data from a retrospective study on urothelial cancer of the bladder between 1975 and 1991 in La Rioja (Spain), an estimate was made of total Relative Risk, Mantel-Haenszel relative weighted risk and Greenland-Robins 95% confidence interval of suffering infiltrant bladder cancer in male versus female, assuming that the tumour affecting the muscle layer was infiltrant.
  
  
  RESULTS
  Total Relative Risk (1.05). Mantel-Haenszel relative weighted risk (1.08), and Greenland-Robins confidence interval (0.65-Relative Risk-1.08).
  
  
  CONCLUSIONS
  It is concluded that sex differences have no influence on the risk to develop infiltrant urothelial cancer of the bladder at diagnosis.
authors.affiliation: Servicio de Urología, Complejo Hospitalario San Millán San Pedro, Logroño, La Rioja.
authors.forename: A
authors.initials: A
authors.lastname: Fernández Fernández
authors.forename: C
authors.initials: C
authors.lastname: García Escudero
authors.forename: M
authors.initials: M
authors.lastname: Fernández Ruiz
authors.forename: P
authors.initials: P
authors.lastname: Domínguez Benito
authors.forename: J
authors.initials: J
authors.lastname: Gil Fabra
authors.forename: G
authors.initials: G
authors.lastname: Otero Mauricio
mesh_terms: D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D009361:Neoplasm Invasiveness; D012189:Retrospective Studies; D017678:Sex Distribution; D001749:Urinary Bladder Neoplasms / Q000473:pathology*
vernacular_title: Influencia de la diferencia de sexo en la agresividad biológica del tumor urotelial vesical en su primer diagnóstico.