Gleason underestimation is predicted by prostate biopsy core length

Area of Science:

• Urology
• Oncology
• Pathology

Background:

• Prostate cancer diagnosis relies on accurate Gleason scoring from biopsy.
• Underestimation of Gleason score can lead to suboptimal treatment decisions.
• Radical prostatectomy (RP) specimens provide a definitive comparison for biopsy accuracy.

Purpose of the Study:

• To determine if prostate biopsy core length influences diagnostic accuracy.
• To assess the impact of core length on Gleason score underestimation compared to RP.
• To evaluate the role of performer experience in biopsy accuracy and Gleason discordance.

Main Methods:

• Analysis of 8,928 trans-rectal biopsy cores from 744 patients.
• Comparison of biopsy findings with subsequent radical prostatectomy (RP) specimens.
• Prospective analysis of variables including core length, patient demographics, and PSA parameters.

Main Results:

• Shorter mean core length (11.61 mm) was associated with Gleason upgrading (42.7%) compared to longer cores (13.52 mm).
• Each millimeter increase in core length decreased Gleason upgrading risk by 89.9% (p=0.049).
• Performer experience showed no significant difference in biopsy positivity or Gleason discordance.

Conclusions:

• Prostate biopsy core length is an independent predictor of Gleason upgrading.
• Performer experience has a minimal effect on Gleason score accuracy due to a rapid learning curve.
• Optimizing core length is crucial for improving prostate cancer diagnosis and treatment planning.