Combination of Multiparametric Magnetic Resonance Imaging With Elastic-fusion Biopsy Has a High Sensitivity in Detecting Clinically Significant Prostate Cancer in Daily Practice.

Background: The index lesion (IL) is the largest cancer focus, usually harbors the highest grade, and might drive the history of prostate cancer (PCA). Multiparametric magnetic resonance imaging (mp-MRI) has a high negative predictive value in ruling out clinically significant (cs)PCA. We aimed evaluating the efficiency of mp-MRI and targeted biopsy in detecting csPCA and the concordance between the MRI index lesion (MRI-IL) and the presence of csPCA inside it.
Materials and Methods: We retrospectively evaluated 158 men who underwent prostate biopsy after a positive pre-biopsy mp-MRI scan. All mp-MRI lesions were biopsied using a transrectal ultrasound elastic-fusion approach (2-4 targeted plus 10-12 random systematic biopsies). csPCA was defined as grading group ≥ 2 or > 3 cores with cancer or ≥ 50% of core involved by tumor.
Results: mp-MRI detected 158 ILs and 46 non-ILs. One hundred were Prostate Imaging-Reporting and Data System version 2 (PI-RADS v2) score 3, 84 score 4, and 20 score 5. csPCA was found in 63.9% of the MRI-ILs. Eighty percent of detected cancer using mp-MRI and targeted biopsy was clinically significant. Eighty-seven percent of the transitional zone lesions were clinically non-significant or negative for cancer. The probability of detecting csPCA increases with increasing size of MRI-IL, and every extra millimeter raises the odds of detecting csPCA of 12.2%. All PI-RADS v2 score lesions showed a strong association with csPCA. The risk of matching between MRI-IL and csPCA inside it increases by 36.2% as the total percentage of cancer in all cores increases.
Conclusions: mp-MRI showed high sensitivity in detecting csPCA in the peripheral zone, with concordance between MRI-IL and csPCA.
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