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External Validation of the Pathologic Nodal Staging Score for Prostate Cancer: A Population-based Study.

Malte Rieken1, Luis A Kluth2, Christian Seitz3

  • 1Department of Urology, Medical University of Vienna, Vienna, Austria; Department of Urology, Weill Cornell Medical College, New York Presbyterian Hospital, New York, NY.

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Summary

This study validated a prostate cancer staging score using a large patient database. The score helps determine the likelihood of lymph node metastasis, aiding treatment decisions.

Keywords:
Lymph node dissectionLymph node metastasisProbabilityRadical prostatectomySurveillance, Epidemiology, and End Results

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Area of Science:

  • Urology
  • Oncology
  • Pathology

Background:

  • Prostate cancer (PCa) staging is crucial for treatment decisions.
  • Accurate pathologic nodal staging is essential after radical prostatectomy.
  • External validation of staging models ensures generalizability.

Purpose of the Study:

  • To externally validate the pathologic nodal staging score (pNSS) model.
  • To quantify the likelihood of lymph node (LN) metastasis in node-negative PCa patients.
  • To refine decision-making for adjuvant therapy in prostate cancer.

Main Methods:

  • Analysis of 50,598 patients from the Surveillance, Epidemiology, and End Results database.
  • Utilized radical prostatectomy and pelvic LN dissection data.
  • Estimated pathologic nodal staging sensitivity using a β-binomial model and developed a novel pNSS model.

Main Results:

  • 96.9% of patients were pathologically node-negative (pN0).
  • The probability of missing a positive LN decreased with more examined LNs.
  • Adequate nodal staging required more LNs for advanced tumor stage, higher Gleason sum, positive margins, and higher PSA.

Conclusions:

  • The number of examined LNs for adequate nodal staging in PCa is dependent on tumor stage, Gleason sum, margins, and PSA.
  • The pNSS model was externally validated in a population-based cohort.
  • This validation can improve decisions regarding adjuvant therapy in prostate cancer.