title: Is there a role of the histologic subtypes of papillary renal cell carcinoma as a prognostic factor?
abstract: OBJECTIVE
  The aim of this study was to compare type 1 and type 2 papillary renal cell carcinoma (RCC) for validating this subclassification as a prognostic factor.
  
  
  METHODS
  A total of 70 patients with chromophobe RCC were included in the analysis. Patients with papillary RCC were categorized into type 1 (n = 33) and type 2 (n = 37).
  
  
  RESULTS
  The median progression-free survival was 31.0 months for the type 1 group and 12.0 months for the type 2 group (P = 0.001). The median cancer-specific survival was 41.1 months for the type 1 group and 24.0 months for the type 2 group (P = 0.097). Multivariate Cox proportional hazards model for patients with papillary RCC showed that no variables including histologic subtyping were independent predictors of progression-free and cancer-specific survival.
  
  
  CONCLUSIONS
  In the present study, the type of papillary RCC does not reach independent prognostic significance.
authors: Department of Urology, Seoul National University Hospital, Jongno Ku, Seoul, Korea.
authors: Ja Hyeon
authors: JH
authors: Ku
authors: Kyung Chul
authors: KC
authors: Moon
authors: Cheol
authors: C
authors: Kwak
authors: Hyeon Hoe
authors: HH
authors: Kim
authors: Sang Eun
authors: SE
authors: Lee
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002292:Carcinoma, Renal Cell / Q000473:pathology*; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D016019:Survival Analysis