Related Experiment Video
Updated: Feb 16, 2026

A New Technique for Treating Low-risk Prostate Cancer—Super Active Surveillance
Published on: November 7, 2025
Association between baseline prostate MRI PI-RADS classification and risk of Gleason upgrade during active
Shayan Smani1, Nishan Sohoni1, Marcin Miszczyk2,3
1Yale School of Medicine, New Haven, CT, USA.
Purpose:
Although prostate magnetic resonance imaging (MRI) enhances the detection of high-grade prostate cancer (PCa), its predictive role in active surveillance (AS) of favorable risk PCa is unclear. We examined the association between baseline MRI Prostate Imaging-Reporting and Data System (PI-RADS) score and Gleason Grade Group (GG) upgrade risk among patients managed with AS.
Methods:
We systematically searched eight databases to identify studies evaluating the association between baseline PI-RADS score and the risk of GG upgrade in patients managed with AS for PCa (PROSPERO: CRD42024567762). We pooled the hazard ratios (HR)using Hartung-Knapp random-effects meta-analysis models. We assessed the risk of bias using the ROBINS-I tool.
Results:
We included eleven studies (n = 6309) in the meta-analysis. The risk of bias was moderate, attributed to the retrospective and unblinded design of seven included studies. Among studies reporting baseline PI-RADS, 2,640 patients (52.1%) had PI-RADS 1-3 lesions, and 2,421 patients (47.9%) had PI-RADS 4-5 lesions. Baseline PI-RADS 4-5 was associated with an increased risk of upgrade compared to those with PI-RADS 1-3 lesions (HR:2.21, 95%CI: 1.66-2.93, p<.001). Compared to PI-RADS 1-2, the presence of PI-RADS 3 (HR:1.88, 95%CI: 1.29-2.74, p=.008), PI-RADS 4 (HR:2.73, 95%CI: 2.08-3.58, p<.001), or PI-RADS 5 (HR:3.69, 95%CI: 2.50-5.45, p<.001) lesions were associated with an increased risk of upgrade.
Conclusions:
Baseline prostate MRI finding as assessed with PI-RADS is highly prognostic for GG upgrading among patients with favorable risk PCa managed with AS. These findings support further study of tailored surveillance strategies based on initial MRI findings.
Insights
Prostate MRI PI-RADS scores predict Gleason Grade Group (GG) upgrade risk in favorable-risk prostate cancer (PCa) patients on active surveillance (AS). Higher PI-RADS scores (4-5) indicate a greater risk of GG upgrade.
Area of Science:
- Urology
- Radiology
- Oncology
Background:
- Prostate magnetic resonance imaging (MRI) aids in detecting high-grade prostate cancer (PCa).
- The predictive value of baseline MRI Prostate Imaging-Reporting and Data System (PI-RADS) scores for favorable-risk PCa managed with active surveillance (AS) remains unclear.
Conclusions:
- Baseline prostate MRI PI-RADS scores are highly prognostic for GG upgrading in favorable-risk PCa patients on AS.
- Findings suggest the potential for developing tailored surveillance strategies based on initial MRI results.
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