title: Does overweight impact on the prognosis of patients with renal cell carcinoma? A single center experience of 683 patients.
abstract: OBJECTIVE
  An increased incidence of renal cell carcinoma (RCC) in obese patients has been reported by several authors. We investigated the association of body mass index (BMI) with prognosis of patients with RCC.
  
  
  METHODS
  From January 1994 to December 2000, 693 operations for RCC in 683 consecutive patients were performed at our institution. Patients' BMI at operation was evaluated, overall, tumor-specific and progression-free survival was investigated using the Kaplan-Meier method, for multivariate analysis the Cox regression model was used.
  
  
  RESULTS
  Four hundred seventeen patients were males, 266 females. Mean age was 62 years (range 16-88). BMI was available in 609 (89.2%). 371/609 (60.9%) of patients exhibited a BMI greater than 25. After a mean follow-up of 41.5 months, 86 (12.6%) patients died from metastatic RCC, and 29 (4.3%) were alive with metastatic disease. A significant advantage regarding overall (P = 0.015) and progression-free (0.017) but not tumor-specific survival (P = 0.057) was found for patients with a BMI of more than 25 compared to normal-weight patients. In multivariate analysis, BMI showed no significant association with tumor-specific survival.
  
  
  CONCLUSIONS
  Patients with a BMI of more than 25 had a better outcome compared to patients with normal weight in univariate analysis but not multivariate analysis.
authors.affiliation: Department of Urology, University Hospital Graz, Karl Franzens University Graz, Austria.
authors.forename: Luigi
authors.initials: L
authors.lastname: Schips
authors.forename: Katja
authors.initials: K
authors.lastname: Lipsky
authors.forename: Richard
authors.initials: R
authors.lastname: Zigeuner
authors.forename: Stefano
authors.initials: S
authors.lastname: Gidaro
authors.forename: Michael
authors.initials: M
authors.lastname: Salfellner
authors.forename: Peter
authors.initials: P
authors.lastname: Rehak
authors.forename: Karl
authors.initials: K
authors.lastname: Pummer
authors.forename: Gerhart
authors.initials: G
authors.lastname: Hubmer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D002292:Carcinoma, Renal Cell / Q000453:epidemiology / Q000401:mortality*; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D015994:Incidence; D007680:Kidney Neoplasms / Q000453:epidemiology / Q000401:mortality*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009765:Obesity; D011379:Prognosis; D016016:Proportional Hazards Models; D015996:Survival Rate