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Postoperative nomogram for invasive bladder cancer: does it really work? A multicenter cohort study.

Pier Francesco Bassi¹, Luca Bongiovanni, Marco Racioppi

¹Università Cattolica S. Cuore, Policlinico A. Gemelli, Cattedra di Urologia, Rome, Italy.

Urologic Oncology

|December 5, 2009

Summary

This study found that the International Bladder Cancer Nomogram Consortium predictions showed a statistical correlation with actual clinical outcomes in patients undergoing radical cystectomy. The nomogram accurately predicted disease-free survival, though it slightly underestimated outcomes in most risk groups.

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Area of Science:

Urology
Oncology
Biostatistics

Background:

Nomograms are statistical tools used to predict patient outcomes.
Radical cystectomy (RC) is a major surgical procedure for bladder cancer.
Accurate prediction of disease-free survival is crucial for patient management.

Purpose of the Study:

To assess the statistical correlation between the International Bladder Cancer Nomogram Consortium predictions and clinical outcomes.
To validate the nomogram's accuracy in a multicenter Italian cohort of patients treated with radical cystectomy and pelvic lymph-nodes dissection.

Main Methods:

A cohort of 204 patients who underwent radical cystectomy was analyzed.
Patients were stratified into low, intermediate, and high-risk groups based on predicted 5-year disease-free survival (pDFS).
Predictive accuracy was quantified using the area under the curve (AUC) from receiver operating characteristic (ROC) curves. Actual overall survival (aOS) and actual disease-free survival (aDFS) were calculated using Kaplan-Meier analysis.

Main Results:

The nomogram achieved an AUC of 0.69 (P < 0.001).
The 5-year actual disease-free survival (aDFS) was 65.6% overall.
The nomogram slightly underestimated predicted disease-free survival (pDFS) across all risk groups, particularly in the intermediate-risk group where aDFS exceeded pDFS predictions.

Conclusions:

A statistical correlation was observed between the postoperative nomogram predictions and actual clinical outcomes.
The nomogram demonstrated good predictive accuracy for disease-free survival after radical cystectomy.
The findings support the utility of nomograms in predicting outcomes for bladder cancer patients undergoing radical cystectomy.