Abstract
Objectives
The main objective is to propose an MRI-based screening protocol, investigating the role of MRI without the injection of contrast media (bi-parametric MRI, bpMRI) as a secondary prevention test for prostate cancer (PCa) early diagnosis, comparing MRI with the prostate specific antigen (PSA) test. For this reason, preliminary results of Prostate Cancer Secondary Screening in Sapienza (PROSA) are presented, to investigate the efficiency of an MRI-based screening protocol.
PROSA is a prospective, randomized, single-center study. To date, 351 men have been enrolled and blindly randomized into two different arms:
-
(A)
Men underwent a bpMRI regardless of their PSA values (175);
-
(B)
Men followed as per clinical practice: those with increased PSA (61) were referred to bpMRI, while those with normal PSA (112) were not.
Men who screened positive on MRI were directed to MR-directed targeted biopsy.
On arm A, 4 clinically significant PCa have been detected, while none was found on arm B (p = 0.046).
To evaluate the efficiency of the screening protocol, we calculated the experimental event rate (EER, 3.6%), control event rate (CER, 1.2%.), absolute risk reduction (ARR, 2.5%), and number needed to treat (NNT, 40.3).
PROSA represents an interesting experience in the field of imaging-based PCa screening. The preliminary data from this trial highlight the promising role of non-contrast MRI as a screening tool for early detection of PCa. Further data will finally validate the most appropriate screening program.
Clinical relevance statement
PROSA depicts an interesting experience in the field of research focused on imaging-based prostate cancer screening. Its preliminary data highlight the promising role of non-contrast MRI as a screening tool for early detection of PCa.
Key Points
• Promotion of an MRI-based screening protocol, investigating the role of non-contrast MRI as a secondary prevention test for prostate cancer early diagnosis, comparing MRI with PSA test.
• Prostate Cancer Secondary Screening in Sapienza (PROSA) represents an interesting experience in the field of research focused on imaging-based prostate cancer screening; its preliminary results indicate that it is possible to use non-contrast MRI as a screening tool for early detection of PCa.
• This new approach to PCa screening could facilitate the early diagnosis of clinically significant prostate cancer while reducing the number of unnecessary prostate biopsies and the detection of clinically insignificant prostate cancer.
Abbreviations
- ADC:
-
Apparent diffusion coefficient
- ARR:
-
Absolute risk reduction
- bpMRI:
-
Bi-parametric MRI
- CER:
-
Control event rate
- ciPCa:
-
Clinically insignificant PCa
- csPCa:
-
Clinically significant PCa
- DWI:
-
Diffusion-weighted imaging
- EER:
-
Experimental event rate
- MRDB:
-
MR-Directed biopsies
- NND:
-
Number needed to diagnose
- NNT:
-
Number needed to treat
- PCa:
-
Prostate cancer
- PI-RADS:
-
Prostate Imaging Reporting and Data System
- PSA:
-
Prostate-specific antigen
- TRUS-MRI Fusion:
-
Trans-rectal ultrasound-magnetic resonance imaging fusion
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The scientific guarantor of this publication is Valeria Panebianco.
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Valeria Panebianco is a member of the European Radiology Scientific Editorial Board but has not taken part in the review or selection process of this article.
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Messina, E., La Torre, G., Pecoraro, M. et al. Design of a magnetic resonance imaging-based screening program for early diagnosis of prostate cancer: preliminary results of a randomized controlled trial—Prostate Cancer Secondary Screening in Sapienza (PROSA). Eur Radiol 34, 204–213 (2024). https://doi.org/10.1007/s00330-023-10019-1
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DOI: https://doi.org/10.1007/s00330-023-10019-1