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National Wilms Tumor Study: an update for pathologists.

J B Beckwith1

  • 1Department of Pathology and Human Anatomy, Loma Linda University, CA 92350, USA.

Pediatric and Developmental Pathology : the Official Journal of the Society for Pediatric Pathology and the Paediatric Pathology Society
|August 27, 1999
PubMed
Summary

The National Wilms Tumor Study (NWTS)-5 refines Wilms tumor staging. New criteria improve therapy and prognosis by clarifying stage 1 and renal sinus distinctions, incorporating focal anaplasia.

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Area of Science:

  • Pediatric Oncology
  • Nephrology
  • Tumor Staging

Background:

  • The National Wilms Tumor Study (NWTS)-5, initiated in August 1995, introduced significant updates to Wilms tumor management.
  • Previous staging criteria required refinement to better guide therapeutic decisions and predict patient outcomes.

Purpose of the Study:

  • To update staging criteria for Wilms tumor to improve therapeutic stratification and prognostic accuracy.
  • To refine definitions for Stage 1 and Stage 2 Wilms tumors, particularly concerning the renal sinus.
  • To incorporate the prognostic significance of focal anaplasia into the study design.

Main Methods:

  • Refinement of criteria for Stage 1 Wilms tumors to include cases managed with nephrectomy alone.
  • Redefinition of the distinction between Stage 1 and Stage 2 Wilms tumors in the renal sinus, moving away from the hilar plane.

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  • Inclusion of the presence or absence of venous or lymphatic invasion for renal sinus staging.
  • Evaluation and incorporation of the topographical definition of focal anaplasia.

    • Main Results:

    • Established new criteria for Stage 1 Wilms tumors, allowing for nephrectomy-only management in select cases.
    • Clarified the staging distinction in the renal sinus based on vascular and lymphatic invasion, rather than the hilar plane.
    • Demonstrated the prognostic value of focal anaplasia, integrating it into the NWTS-5 protocol.

    Conclusions:

    • The updated NWTS-5 staging criteria provide a more precise framework for Wilms tumor management and prognosis.
    • The revised definitions enhance the ability to differentiate tumor stages, particularly in the challenging renal sinus region.
    • Incorporation of focal anaplasia further refines prognostic assessment in Wilms tumor patients.