Lymph node dissection during radical nephrectomy: A Canadian multi-institutional analysis.

To determine the association between lymph node dissection (LND) at the time of radical nephrectomy and survival in a large, multi-institutional cohort using a propensity score matching design.

The Canadian Kidney Cancer information system was used to identify patients undergoing radical nephrectomy for nonmetastatic renal cell carcinoma. Associations between LND with overall survival , recurrence free survival and cancer specific survival were determined using various propensity score techniques in the overall cohort and in patients with varying probabilities of pN1. Cox models were used to determine association of lymph node removed with outcomes.

Of the 2,699 eligible patients, 812 (30%) underwent LND. Of the LND patients, 88 (10.8%) had nodal metastases. There was no association between LND and improved overall survival, recurrence free survival or cancer specific survival using various propensity score techniques (stratification by propensity score quintile, matched pairs, inverse treatment probability weighting and adjusted for propensity score quintile). There was no association between LND and a therapeutic benefit in patients with increased threshold probabilities of nodal metastases. Increased number of lymph nodes removed was not associated with improved survival outcomes.

LND at the time of radical nephrectomy for renal cell carcinoma is not associated with improved outcomes. There was no benefit in patients at high risk for nodal metastases, and the number of nodes removed did not correlate with survival. Further studies are needed to determine which high risk patients may benefit from LND.

Urologic oncology. 2021 Mar 27 [Epub ahead of print]

Andrea Kokorovic, Rodney H Breau, Anil Kapoor, Antonio Finelli, Alan I So, Luke T Lavallee, Simon Tanguay, Frederic Pouliot, Darrel E Drachenberg, Adrian Fairey, Jean-Baptiste Lattouf, Jun Kawakami, Lori Wood, Ranjeeta Mallick, Ricardo A Rendon

The University of Texas MD Anderson Cancer Center, Houston, TX., University of Ottawa, Ottawa, ON, Canada., McMaster University, Hamilton, ON, Canada., Princess Margaret Hospital, University of Toronto, Toronto, ON, Canada., University of British Colombia, Vancouver, BC, Canada., McGill University, Montreal, QC, Canada., University Laval, Quebec City, QC, Canada., University of Manitoba, Winnipeg, MB, Canada., University of Alberta, Edmonton, AB, Canada., Universite de Montreal, Montreal, QC, Canada., University of Calgary, Calgary, AB, Canada., Dalhousie University, Halifax, NS, Canada., The University of Texas MD Anderson Cancer Center, Houston, TX. Electronic address: .