Comparing R.E.N.A.L., PADUA, and RPN Scores: Is RPN the More Logical Choice in the Robotic Era?

Area of Science:

• Urology
• Surgical Oncology
• Medical Informatics

Background:

• First-generation nephrometry systems (R.E.N.A.L. and PADUA) have been used since 2009 for kidney cancer characterization and predicting partial nephrectomy (PN) outcomes.
• The Radius, Position of the tumour, iNvasion of renal sinus (RPN) system was introduced in 2022 to specifically evaluate renal tumours for robot-assisted laparoscopic approaches.
• This paper provides a critical comparison of these three nephrometry systems.

Purpose of the Study:

• To critically compare the R.E.N.A.L., PADUA, and RPN nephrometry systems.
• To evaluate their aims, methodologies, validation performance, and ease of use.
• To assess their applicability in the context of robot-assisted partial nephrectomy (RAPN).

Main Methods:

• Extraction of key information on nephrometry systems into a comparative table.
• Analysis of nomenclature, tumor characteristics, suffixes, methodological differences, validation, and ease of use.
• Critical review of existing literature and validation studies.

Main Results:

• R.E.N.A.L. and PADUA systems are general tools for PN decision-making and reporting, not specific to robot-assisted surgery.
• The RPN system is specifically designed for robot-assisted partial nephrectomy (RAPN), focusing on preoperative surgical difficulty assessment.
• Distinct differences exist in the methodologies and objectives of the R.E.N.A.L., PADUA, and RPN systems.

Conclusions:

• The RPN system shows promise for evaluating renal tumor complexity in the context of RAPN.
• Surgeons need simple, user-friendly systems for accurate and rapid assessment of renal tumor surgical complexity.
• Further validation is required to fully establish the RPN system's utility in modern RAPN practice.