Background: We aim to correlate multiparametric magnetic resonance imaging (mpMRI) of the prostate reporting (Prostate Imaging Reporting and Data System [PI-RADS] version 2) with the Gleason score into both radical prostatectomy (RP) specimen and MRI fusion-targeted biopsies (FTB).
Methods: mpMRI of 74 patients who underwent an RP after FTB were retrospectively reviewed. The Gleason score distribution was compared according to the PI-RADS score using the Kruskal-Wallis test. Results were compared to those of the mpMRI-guided biopsy of the same anatomical zone. For comparison, 903 RP specimen and their corresponding classical biopsies were also reviewed. Cohen's kappa concordance test was used to compare biopsies and prostatectomy specimen analyses.
Results: An exact match between Gleason grade in RP specimen and FTB was found in 62% of the cases. There was no significant difference in Gleason score ≤7 (3 + 4) vs. ≥7 (4 + 3) distribution according to the PI-RADS scores (p = 0.096). Overall, Kappa coefficients were similar with MRI-targeted biopsies compared to classical biopsies (κ = 0.378, 95% CI [0.194-0.563], and κ = 0.316, 95% CI [0.259-0.374], respectively).
Conclusions: PI-RADS score was not associated with significant differences regarding Gleason score distribution within target. Moreover, concordance of Gleason score in both MRI-targeted and classical biopsies with those within target in RP specimen was weak.
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