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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)

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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:

  1. (A)

    Men underwent a bpMRI regardless of their PSA values (175);

  2. (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.

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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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Funding

The authors state that this work has not received any funding.

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Valeria Panebianco.

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Guarantor

The scientific guarantor of this publication is Valeria Panebianco.

Conflict of interest

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.

The remaining authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

Statistics and biometry

No complex statistical methods were necessary for this paper.

Informed consent

Written informed consent was obtained from all subjects (patients) in this study.

Ethical approval

Institutional Review Board approval was obtained (approval 09/09/2020, Ref. 5996).

Study subjects or cohorts overlap

N.A.

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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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