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External validation of a brazilian predictive nomogram for pathologic outcomes following radical prostatectomy in tertiary teaching institutions: the USP nomograms

Bastian Júnior, Aguinel José ; Dall?Oglio, Marcos Francisco ; Crippa, Alexandre ; Oliveira Filho, Getúlio Rodrigues de ; Piovesan, Luís Felipe ; Silva, Ricardo Kupka da ; Leite, Katia R. M ; Srougi, Miguel

International Brazilian journal of urology, 2014-04, Vol.40 (2), p.161-171 [Peer Reviewed Journal]

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  • Title:
    External validation of a brazilian predictive nomogram for pathologic outcomes following radical prostatectomy in tertiary teaching institutions: the USP nomograms
  • Author: Bastian Júnior, Aguinel José ; Dall?Oglio, Marcos Francisco ; Crippa, Alexandre ; Oliveira Filho, Getúlio Rodrigues de ; Piovesan, Luís Felipe ; Silva, Ricardo Kupka da ; Leite, Katia R. M ; Srougi, Miguel
  • Subjects: UROLOGY & NEPHROLOGY
  • Is Part Of: International Brazilian journal of urology, 2014-04, Vol.40 (2), p.161-171
  • Description: Purposes(a) To externally validate the Crippa and colleagues’ nomograms combining PSA, percentage of positive biopsy cores (PPBC) and biopsy Gleason score to predict organ-confined disease (OCD) in a contemporary sample of patients treated at a tertiary teaching institution. (b) To adjust such variables, resulting in predictive nomograms for OCD and seminal vesicle invasion (SVI): the USP nomograms.Materials and MethodsThe accuracy of Crippa and colleagues’ nomograms for OCD prediction was examined in 1002 men submitted to radical prostatectomy between 2005 and 2010 at the University of São Paulo (USP). ROC-derived area under the curve (AUC) and Brier scores were used to assess the discriminant properties of nomograms for OCD. Nomograms performance was explored graphically with LOESS smoothing plots. Furthermore, univariate analysis and logistic regression models targeted OCD and SVI. Variables consisted of PSA, PPBC, biopsy Gleason score and clinical stage. The resulted predictive nomograms for OCD and SVI were internally validated with bootstrapping and the same abovementioned procedures.ResultsCrippa and colleagues’ nomograms for OCD showed ROC AUC = 0.68 (CI: 0.65-0.70), Brier score = 0.17 and overestimation in LOESS plots. USP nomograms for OCD and SVI showed ROC AUC of 0.73 (CI: 0.70-0.76) and 0.77 (CI: 0.73-0.79), respectively, and Brier scores of 0.16 and 0.08, respectively. The LOESS plots showed excellent calibration for OCD and underestimation for SVI.ConclusionsCrippa and colleagues’ nomograms showed moderate discrimination and considerable OCD overestimation. USP nomograms showed good discrimination for OCD and SVI, as well as excellent calibration for OCD and SVI underestimation.
  • Publisher: Sociedade Brasileira de Urologia
  • Language: English;Portuguese
  • Identifier: ISSN: 1677-5538
    ISSN: 1677-6119
    EISSN: 1677-5538
    DOI: 10.1590/S1677-5538.IBJU.2014.02.05
  • Source: Freely Accessible Science Journals
    Freely Accessible Medical Journals
    SciELO
    Directory of Open Access Journals
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