PI-RADS Version 2: Detection of Clinically Significant Cancer in Patients With Biopsy Gleason Score 6 Prostate Cancer

The purpose of this study was to analyze the utility of the Prostate Imaging Reporting and Data System version 2 (PI-RADSv2) in the detection of a clinically significant cancers in patients with prostate cancers with a biopsy Gleason score of 6.

A group of 182 consecutively registered patients with biopsy-proven prostate cancer with a Gleason score of 6 underwent MRI and radical prostatectomy. Clinically significant cancer was surgically defined as Gleason score of 7 or greater, tumor volume of 0.5 cm(3) or greater, or tumor category T3 or greater. Clinical parameters (prostate-specific antigen level, greatest percentage of biopsy core, and percentage of positive cores) and the PI-RADSv2 ratings by three independent readers (experienced readers 1 and 2, inexperienced reader 3) were investigated. Cutoffs and the diagnostic performance of PI-RADSv2 for clinically significant cancer were analyzed.

Clinically significant cancer was found in 87.4% (159/182) of patients. The cutoff PI-RADSv2 score for clinically significant cancer was 4 for readers 1 and 2 and 5 for reader 3. The AUCs were 0.829 and 0.853 for readers 1 and 2 (p < 0.001) and 0.602 for reader 3 (p = 0.067). For reader 1, sensitivity was 89.9% (143/159); specificity, 69.6% (16/23); positive predictive value, 95.3% (143/150); negative predictive value, 50.0% (16/32); and accuracy, 87.4% (159/182). The corresponding values for reader 2 were 81.1% (129/159), 82.6% (19/23), 97.0% (129/133), 38.8% (19/49), and 81.3% (148/182). For the experienced readers, 66.7-81.3% of patients with false-negative results had clinically significant cancers with tumor volume less than 1 cm(3).

PI-RADSv2 may help experienced readers identify clinically significant prostate cancers in patients with a biopsy Gleason score of 6. However, some small (< 1 cm(3)) clinically significant cancers can be missed when PI-RADSv2 is used.

AJR. American journal of roentgenology. 2017 Apr 18 [Epub ahead of print]

Ji Won Seo, Su-Jin Shin, Young Taik Oh, Dae Chul Jung, Nam Hoon Cho, Young Deuk Choi, Sung Yoon Park

1 Department of Radiology and Research Institute of Radiological Science, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of Korea., 2 Department of Pathology, Yonsei University College of Medicine, Seoul, Republic of Korea., 4 Department of Urology, Yonsei University College of Medicine, Seoul, Republic of Korea.

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