The Predictive Ability of Pre-Operative Magnetic Resonance Imaging to Detect Pathological Outcomes in Prostate Cancer

Area of Science:

• Urology
• Radiology
• Oncology

Background:

• Accurate staging of prostate cancer is crucial for surgical planning in radical prostatectomy (RP).
• Multiparametric MRI (mpMRI) is increasingly used for preoperative assessment.
• Predicting pathological outcomes preoperatively aids in optimizing treatment strategies.

Purpose of the Study:

• To evaluate the predictive accuracy of mpMRI for pathological outcomes in patients undergoing RP.
• To assess mpMRI's ability to detect extra-capsular extension (ECE) and seminal vesicle invasion (SVI).

Main Methods:

• Retrospective review of 145 patients who underwent RP over a 4-year period.
• Analysis of preoperative mpMRI findings against final histopathology results.
• Calculation of sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for ECE and SVI detection.

Main Results:

• mpMRI identified T3/T4 disease in 17.9% of patients.
• Histopathology confirmed ECE in 6.9% and SVI in 0.7% of patients.
• MRI sensitivity for ECE was 27.3% and for SVI was 11.1%; specificity was 87.6% for ECE and 97.8% for SVI.
• PPV for ECE was 45.5% and for SVI was 25%; NPV was 75.9% for ECE and 94.4% for SVI.

Conclusions:

• mpMRI demonstrates high specificity but low and variable sensitivity in predicting T3 disease in RP specimens.
• The predictive performance for ECE and SVI is limited, particularly concerning sensitivity.
• Findings suggest caution in relying solely on mpMRI for definitive preoperative staging of advanced prostate cancer.