A preoperative prognostic nomogram for solid enhancing renal tumors 7 cm or less amenable to partial nephrectomy

Area of Science:

• Urology
• Oncology
• Pathology

Background:

• Small renal masses (SRMs) are increasingly diagnosed.
• Traditional treatment involves nephrectomy, but ablative therapies and observation are growing options.
• Accurate preoperative risk stratification is crucial for guiding management decisions.

Purpose of the Study:

• To develop and validate nomograms predicting benign, indolent, or aggressive pathological findings in SRMs.
• To identify preoperative clinical factors associated with different tumor pathologies.
• To aid in selecting appropriate management strategies for SRMs.

Main Methods:

• Retrospective analysis of 862 patients undergoing partial nephrectomy for SRMs (≤7 cm).
• Tumors classified as benign, likely indolent, or potentially aggressive (based on specific criteria).
• Multivariable logistic regression used age, gender, tumor size, symptoms, and smoking history to build predictive models.

Main Results:

• 20% of SRMs were benign, 80% malignant; only 24% of all SRMs were potentially aggressive.
• Age, gender, tumor size, and smoking history predicted benign pathology (concordance index 0.644).
• Predicting indolent vs. aggressive cancer was limited, with only advanced age being significant (concordance index 0.557).

Conclusions:

• Clinical factors offer significant predictive power for distinguishing benign from malignant SRMs.
• While most SRMs are not aggressive, accurately predicting aggressive cancer in this cohort remains a challenge.
• Nomograms can assist in preoperative risk stratification for SRMs.