Impact of tumour morphology on renal function decline after partial nephrectomy

Area of Science:

• Nephrology
• Urology
• Oncology

Background:

• Partial nephrectomy (PN) is a standard treatment for renal tumors.
• Assessing pre-operative risk factors for post-operative renal function is crucial.
• The RENAL nephrometry score is a tool to describe renal tumor complexity.

Purpose of the Study:

• To investigate the association between renal morphology, as quantified by the RENAL nephrometry score, and renal function after PN.
• To identify risk factors for decreased estimated glomerular filtration rate (eGFR) post-PN.

Main Methods:

• Retrospective analysis of 322 partial nephrectomies (PNs).
• Patients were stratified into low (<8) and high (≥8) RENAL nephrometry score groups.
• Estimated glomerular filtration rate (eGFR) was calculated preoperatively and at follow-up; multivariable analysis was performed.

Main Results:

• Higher RENAL scores were associated with larger tumor size and a greater percentage of patients with decreased eGFR.
• Each 1-point increase in RENAL score correlated with a 2.5% decrease in eGFR.
• Increasing RENAL score and lower preoperative eGFR were independent risk factors for post-PN eGFR <60 mL/min/1.73 m(2).

Conclusions:

• The RENAL nephrometry score is an independent predictor of reduced renal function after PN.
• The RENAL score may enhance pre-operative risk stratification for patients undergoing PN.
• Further research is needed to validate the utility of the RENAL score in this context.