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Does Margin Length Predict Recurrence After Partial Nephrectomy, or Is Presence Alone Sufficient?

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The presence of positive surgical margins (PSMs) after partial nephrectomy significantly increases recurrence risk. However, the length of the positive margin does not appear to influence local recurrence rates in kidney cancer patients.

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Area of Science:

  • Urology
  • Oncology
  • Surgical Pathology

Background:

  • Partial nephrectomy (PN) is a standard treatment for kidney tumors.
  • The oncological safety of PN hinges on achieving clear surgical margins.
  • The impact of positive surgical margin (PSM) extent on recurrence risk requires clarification.

Purpose of the Study:

  • To determine if the length of positive surgical margins (PSMs) impacts local recurrence after partial nephrectomy (PN).
  • To assess the association between PSM characteristics and local recurrence rates in patients undergoing PN.

Main Methods:

  • Retrospective analysis of data from six centers, including 53 patients with PSMs and 438 with negative surgical margins (NSMs).
  • Pathologic reevaluation to measure margin involvement in micrometers (number of foci, maximum length, total length).
  • Statistical analysis using SPSS 27, with logistic regression to identify recurrence risk factors.

Main Results:

  • Patients with PSMs had a significantly higher local recurrence rate (16.98%) compared to NSM patients (4.24%) (p<0.001).
  • PSM was associated with a fourfold increased risk of recurrence.
  • No significant relationship was found between the length (maximum or total) of positive margin involvement and local recurrence (p=0.044).

Conclusions:

  • The presence of a positive surgical margin (PSM), not its extent, is a significant risk factor for local recurrence after partial nephrectomy.
  • Achieving any negative margin is crucial for reducing oncological risk in PN.
  • Further research may explore the biological mechanisms underlying recurrence risk associated with PSM presence.