Histopathological Ratios to Predict Gleason Score Agreement between Biopsy and Radical Prostatectomy

Area of Science:

• Urology
• Oncology
• Pathology

Background:

• Gleason score from prostate biopsy is critical for treatment selection.
• Biopsy Gleason score may underestimate the true score found after radical prostatectomy.
• Accurate Gleason scoring impacts treatment decisions, including surgery, radiation, and surveillance.

Purpose of the Study:

• To determine the minimum biopsy core length required for accurate Gleason score agreement.
• To identify factors influencing Gleason score discrepancies between biopsy and radical prostatectomy.
• To optimize fusion targeted biopsy protocols for improved prostate cancer grading.

Main Methods:

• Evaluation of 115 prostate cancer patients undergoing multiparametric MRI/transperineal ultrasound fusion biopsy followed by radical prostatectomy.
• Comparison of biopsy-proven Gleason score with Gleason score determined from radical prostatectomy specimens.
• Analysis of ratios between biopsy and tumor volumes to assess Gleason score agreement.

Main Results:

• Gleason score agreement between biopsy and radical prostatectomy was observed in 82.6% of patients.
• In 17.4% of cases, the Gleason score was higher in the radical prostatectomy specimen.
• Gleason score agreement correlated significantly with biopsy-to-tumor volume ratios.

Conclusions:

• Biopsy core length and volume sampling are critical for accurate Gleason score determination.
• Established volume ratios can help predict Gleason score agreement.
• Findings can inform targeted biopsy strategies to minimize underestimation of prostate cancer grade.