The Role of Multiparametric Magnetic Resonance Imaging/Ultrasound Fusion Biopsy in Active Surveillance.

Multiparametric magnetic resonance imaging (mpMRI)/ultrasound fusion biopsy (targeted biopsy or TB) may improve detection of high-grade cancers when compared to systematic biopsy (SB).

To assess TB in active surveillance (AS).

We retrospectively evaluated SB (12-core sector) and TB among 103 AS men undergoing surveillance biopsy, 54 men undergoing confirmatory biopsy (CB), and 73 men referred for diagnostic biopsy (DB; comparison group). Regions of interest (ROIs) on mpMRI were assigned a PI-RADS score and targeted if the score was ≥3.

Detection of Gleason score (GS) ≥7 by TB and SB was the outcome of interest, except in a multivariable model, for which any cancer was the outcome.

GS ≥7was detected by either biopsy method in 25 men (24.3%) in the AS group, 12 men (22.2%) in the CB group, and 55 men (75.3%) in the DB group.GS ≥7 was found in 24.3% by SB + TB versus 20.4% by SB in the AS group (p=0.13); in 22.2% by SB + TB versus 16.7% by SB in the CB group (p=0.25); and in 75.3% by SB + TB versus 58.9% by SB in the DB group (p=0.002). The sensitivity for GS ≥7 detection was lower for TB than for SB (p=0.006) in the AS cohort (relative sensitivity ratio 0.33, 95% confidence interval 0.16-0.71). Higher PI-RADS score (4 vs 3, odds ratio [OR] 2.00, p=0.04; 5 vs 3, OR 4.74, p=0.02), lower MRI-estimated prostate volume (OR 1.20 per 10-cm(3) lower volume, p=0.01), larger ROI (OR 1.04 per mm, p=0.02), and right-sided ROI (OR 2.27, p=0.01) were associated with finding cancer on TB. A potential limitation is that not all men who presented for biopsy underwent TB and the urologist was not blinded to MRI results before SB.

Owing to the low relative sensitivity of mpMRI for detection of GS ≥7 disease, SB still needs to be performed for men on AS.

This study suggests that image-guided prostate biopsy alone may not be informative for men enrolled in an active surveillance program for prostate cancer.

European urology. 2016 May 25 [Epub ahead of print]

Ting Martin Ma, Jeffrey J Tosoian, Edward M Schaeffer, Patricia Landis, Sacha Wolf, Katarzyna J Macura, Jonathan I Epstein, Mufaddal Mamawala, H Ballentine Carter

The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA; The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA., The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA. Electronic address: .