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Predictive factors for complete renal tumor ablation using RFA.

Vanessa Acosta Ruiz1, Maria Lönnemark2, Einar Brekkan3

  • 1Department of Radiology, University Hospital, Uppsala, Sweden vanessa.acosta-ruiz@radiol.uu.se.

Acta Radiologica (Stockholm, Sweden : 1987)
|October 11, 2015
PubMed
Summary

Optimal electrode placement and distance from the collecting system improve radiofrequency ablation (RFA) success for renal tumors. These factors are key for achieving complete tumor ablation in a single session.

Keywords:
Radiofrequency ablation (RFA)ablationablation successcomplete ablationpredictradiofrequencyrenal tumor

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Area of Science:

  • Urology
  • Interventional Radiology
  • Oncology

Background:

  • Radiofrequency ablation (RFA) offers a minimally invasive treatment option for renal masses, particularly when surgery is contraindicated.
  • Procedural planning is crucial to optimize RFA outcomes, considering tumor characteristics like size and location for single-session success.

Purpose of the Study:

  • To identify key factors influencing the primary efficacy of complete renal tumor ablation using radiofrequency in a single session.

Main Methods:

  • Retrospective analysis of 52 renal tumors in 44 patients treated with percutaneous RFA under CT guidance.
  • Data included patient demographics, tumor characteristics (Renal Nephrometry Score, histology), electrode placement, and follow-up for tumor relapse.
  • Statistical analysis utilized generalized estimating equations to determine predictors of complete ablation.

Main Results:

  • The primary efficacy rate for complete ablation was 83%.
  • Optimal electrode placement (OR=16.67) and greater distance from the collecting system (OR=1.18) were significant predictors of success.
  • Tumor size was not a predictor, though all tumors ≤2 cm were completely ablated. Papillary tumors and oncocytomas showed complete ablation, while clear cell carcinoma was most frequently incompletely ablated.

Conclusions:

  • Successful single-session renal tumor RFA is associated with precise electrode placement and adequate distance from the collecting system.
  • These factors are critical for maximizing ablation efficacy and should guide procedural planning.
  • Further research is warranted to explore RFA effectiveness across different renal tumor histologies.