Review – Prostate CancerMagnetic Resonance Imaging–targeted Biopsy May Enhance the Diagnostic Accuracy of Significant Prostate Cancer Detection Compared to Standard Transrectal Ultrasound-guided Biopsy: A Systematic Review and Meta-analysis
Introduction
Transrectal ultrasound-guided prostate biopsy (TRUS-Bx) has been the cornerstone of prostate cancer diagnosis. The introduction of prostate-specific antigen (PSA) testing led to the need for random (not targeted) systematic sampling of the whole prostate by ultrasound guidance. Although the systematic sextant biopsy protocol with six cores has been the standard procedure for many years [1], a meta-analyses of 68 studies showed that a more extended (laterally directed) scheme with 12 cores increased prostate cancer detection in men with suspicion of prostate cancer by a factor of 1.3 [2]. Further increasing the number of cores at initial biopsy did not appear to significantly improve the diagnostic rate [2], [3], [4].
For men undergoing initial biopsy with elevated PSA, prostate cancer detection rates are approximately 40–45% for the systematic 12-core TRUS-Bx [5], [6]. Subsequent serial biopsy results following previous negative biopsies may detect prostate cancer, even after many previous biopsies [6], [7]. In saturation biopsy studies, the false negative rate for 12-core TRUS-Bx following initial biopsy is 20–24% [6], [7]. Attempts to reduce the false-negative rate by additional, anterior, and apical sampling have been only marginally successful [8], [9] and result in oversampling of insignificant tumours. Another approach, transperineal template biopsy, may detect both significant and insignificant additional prostate cancer. Besides increased detection of insignificant cancers, other disadvantages are the requirement for general anaesthesia and an increase in morbidity risk [10], [11].
Several magnetic resonance imaging–guided targeted biopsy (MRI-TBx) methods have been discussed for the diagnosis of prostate cancer in men with a positive PSA test result and/or positive digital rectal examination [12], [13]. The potential of the MRI-TBx approach for improved detection of significant prostate cancer and reductions in unnecessary biopsies of insignificant or absent prostate cancer is still being explored. Therefore, we compared the prostate cancer detection rates of TRUS-Bx and MRI-TBx for diagnostic evaluation in men scheduled for biopsy. To this end we carried out a systematic review and meta-analysis of the recent literature.
Section snippets
Objective
Our aim was to systematically evaluate the benefits of MRI-TBx versus TRUS-Bx for overall prostate cancer detection (primary objective) and significant versus insignificant prostate cancer detection (secondary objective).
Search strategy
The search strategy is described in detail in Supplementary File 1. In summary, for each database the search terms used were (“prostate tumour”) AND (“biopsy” OR “prostate biopsy”) AND (“nuclear magnetic resonance imaging” OR “nuclear magnetic resonance” OR “mri”) AND
Evidence synthesis
Sixteen studies were eligible for inclusion in this review [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35]. Table 2 shows individual data on the methodology, patient population, MRI, biopsy, and pathology protocols, and outcome results.
Conclusions
In men with clinical suspicion of prostate cancer and a suspicious lesion seen on multiparametric MRI, MRI-TBx and TRUS-Bx did not differ in overall detection of prostate cancer. However, MRI-TBx had a higher rate of detection of potentially significant prostate cancer and a lower rate of detection of insignificant prostate cancer compared to the standard TRUS-Bx. Subgroup analysis showed that MRI-TBx improved the detection of significant prostate cancer in men with a previous negative biopsy,
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