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Real-time Fluorescence Microscopy for Intraoperative Assessment of Prostate Biopsy Cores (FLASH) (FLASH)

23 septembre 2026 mis à jour par: Shanghai East Hospital

Fluorescence Microscope for Localized Assessment and Sparing of Histology in Prostate Cancer (FLASH): An International, Multicentre, Prospective Diagnostic Accuracy and Clinical Utility Study With Blinded Index-Test and Reference-Standard Readers

Current prostate cancer diagnosis relies on MRI-targeted biopsy combined with a 12-core systematic biopsy. The systematic component is a major driver of overdiagnosis of insignificant cancer and biopsy-related morbidity, and conventional pathology takes 1-2 weeks, causing significant patient anxiety. The EndoScell system is a handheld, real-time fluorescence microscope that can display the microscopic structure of a fresh biopsy core within minutes, without damaging the tissue.

In this study, every biopsy core from men undergoing standard combined (targeted plus systematic) prostate biopsy will be scanned with this device immediately after removal, and the result will be compared with the final conventional pathology report of the very same core. The device result will not be used to guide any patient care. The study will measure how accurate the device is and simulate how many systematic biopsies could safely be avoided in the future if a positive device reading were used to stop further sampling.

Aperçu de l'étude

Statut

Pas encore de recrutement

Les conditions

Intervention / Traitement

Description détaillée

FLASH is an investigator-initiated, international, multicentre, prospective diagnostic-accuracy and clinical-utility study with a within-patient paired design, conducted and reported in accordance with STARD 2015. Biopsy-naïve men with suspected prostate cancer (serum PSA >4 ng/mL and/or abnormal digital rectal examination) and at least one MRI-visible lesion (PI-RADS v2.1 score 3-5) will undergo standard-of-care combined targeted and systematic prostate biopsy.

Immediately after extraction, every core will undergo ex vivo dual staining (fluorescein sodium for 30 seconds followed by methylene blue for 30 seconds) and contact-mode scanning with the EndoScell real-time fluorescence microscope (model MES-1000P), completed within 5 minutes per core by certified technicians. Each core is assigned to a three-tier category (0 = negative/suspected low-grade; 1 = suspected clinically significant prostate cancer; 2 = equivocal). The interval from core extraction to formalin fixation will not exceed 15 minutes. All cores then undergo routine formalin-fixed paraffin-embedded (FFPE) histopathology with haematoxylin and eosin staining, with immunohistochemistry as clinically indicated, reported by senior uropathologists.

Bidirectional blinding is enforced throughout: technicians are blinded to all clinical data, MRI findings, and core origin; device results are withheld from the treating team and never enter the medical record; uropathologists are blinded to all device data; the statistician works with coded variables until database lock. Central pathology review is performed for discordant and equivocal cases.

The primary outcome is patient-level diagnostic accuracy (sensitivity, specificity, positive and negative predictive values with exact 95% confidence intervals) of the device for clinically significant prostate cancer (ISUP grade group >=2) against FFPE histopathology in the intention-to-diagnose population. Secondary outcomes include core-level concordance with cluster adjustment, inter-reader reproducibility, tissue-integrity assessment, operational metrics, and a prespecified decision-analytic simulation of a "Positive-then-Stop" biopsy-sparing pathway, which is hypothesis-generating and does not alter patient care. The accuracy and utility estimates are intended to inform the design of a future randomised de-implementation trial.

Type d'étude

Observationnel

Inscription (Estimé)

450

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

  • Nom: haifeng wang
  • Numéro de téléphone: 86-13681750891
  • E-mail: 190589109@qq.com

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

40 ans et plus (Adulte, Adulte plus âgé)

Accepte les volontaires sains

Non

Sexes éligibles pour l'étude

Homme

Méthode d'échantillonnage

Échantillon de probabilité

Population étudiée

patients who suspected to have prostate cancer

La description

Inclusion Criteria:

  1. Age >= 40 years;
  2. Serum total PSA > 4.0 ng/mL and/or abnormal digital rectal examination;
  3. Biopsy-naïve;
  4. Pre-biopsy 3.0-T multiparametric MRI demonstrating at least one suspicious lesion (PI-RADS v2.1 score 3-5);
  5. Fit for transperineal or transrectal prostate biopsy under local, regional, or general anaesthesia;
  6. Written informed consent.

Exclusion Criteria:

  1. Prior treatment for prostate cancer (surgery, radiotherapy, focal therapy, or androgen-deprivation therapy), or use of 5-alpha-reductase inhibitors within the preceding 6 months;
  2. Acute prostatitis or active urinary tract infection;
  3. Contraindications to MRI (e.g., incompatible implants, severe claustrophobia);
  4. Severe coagulation disorders or uncorrectable bleeding tendency;
  5. History of major anorectal surgery precluding safe insertion of the endorectal ultrasound probe (where transrectal guidance is used);
  6. Any other condition that, in the investigator's judgement, makes the participant unsuitable for the trial.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Modèles d'observation: COHORT
  • Perspectives temporelles: PROSPECTIVE

Cohortes et interventions

Groupe / Cohorte
Intervention / Traitement
Biopsy-naïve men with suspected prostate cancer

Men undergoing standard-of-care combined targeted plus systematic prostate biopsy; every core undergoes ex vivo EndoScell fluorescence microscopy (index test) followed by FFPE histopathology (reference standard). Device results are not used for patient care.
Test diagnostique: Ex vivo real-time fluorescence microscopy of prostate biopsy cores (EndoScell system, model MES-1000P)

Fresh biopsy cores are stained with fluorescein sodium (30 s) and methylene blue (30 s), scanned in contact mode within 5 minutes per core, and categorised on a three-tier scale; the tissue then proceeds to routine FFPE histopathology unchanged. The test is performed on excised tissue only and does not influence clinical management.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Patient-level sensitivity of the EndoScell system for clinically significant prostate cancer
Délai: Index test on Day 0; reference standard completed Day 7-14

Proportion of reference-positive participants (any core with ISUP grade group >=2 on FFPE histopathology) with at least one core read as Category 1 (suspected clinically significant prostate cancer) on the index test; reported with exact (Clopper-Pearson) 95% confidence interval in the intention-to-diagnose population.
Index test on Day 0; reference standard completed Day 7-14
Patient-level negative predictive value (NPV) of the EndoScell system
Délai: Index test on Day 0; reference standard completed Day 7-14

Proportion of participants with no Category 1 core who are reference-negative; exact 95% CI.
Index test on Day 0; reference standard completed Day 7-14
Patient-level positive predictive value (PPV) of the EndoScell system
Délai: Index test on Day 0; reference standard completed Day 7-14

Proportion of participants with at least one Category 1 core who are reference-positive (ISUP grade group >=2 on FFPE); exact 95% CI.
Index test on Day 0; reference standard completed Day 7-14
Patient-level specificity of the EndoScell system for clinically significant prostate cancer
Délai: Index test on Day 0; reference standard completed Day 7-14

Proportion of reference-negative participants with no core read as Category 1; equivocal (Category 2) readings are grouped with test-negative in the primary analysis, with worst-case/best-case/exclusion sensitivity analyses prespecified; exact 95% CI.
Index test on Day 0; reference standard completed Day 7-14

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Core-level diagnostic concordance
Délai: Index test on Day 0; reference standard completed Day 7-14

Per-core sensitivity, specificity, PPV and NPV of the index test against FFPE histopathology, overall and stratified by core origin (targeted vs systematic), with cluster-robust 95% CIs from a generalised estimating equation (logit link, exchangeable correlation) accounting for within-patient clustering.
Index test on Day 0; reference standard completed Day 7-14
Biopsy-sparing rate of the simulated "Positive-then-Stop" pathway
Délai: Simulation performed after database lock (estimated December 2028)

Proportion of participants in whom systematic biopsy would have been omitted (any targeted core read as Category 1), and the corresponding proportion of systematic cores avoided; prespecified deterministic simulation, exact 95% CIs. Hypothesis-generating; does not alter patient care.
Simulation performed after database lock (estimated December 2028)
Overdiagnosis reduction in the simulated pathway
Délai: Simulation performed after database lock (estimated December 2028)

Number and proportion of ISUP grade group 1 diagnoses that would have been averted by omitting systematic biopsy after a positive intraoperative reading; exact 95% CI.
Simulation performed after database lock (estimated December 2028)
Clinically significant prostate cancer miss rate in the simulated pathway
Délai: Simulation performed after database lock (estimated December 2028)

Number and proportion of reference-positive participants who would have been missed under the simulated pathway (targeted cores negative on both index test and FFPE, with csPCa found only in systematic cores); exact 95% CI.
Simulation performed after database lock (estimated December 2028)
Net benefit of the simulated pathway (decision-curve analysis)
Délai: Simulation performed after database lock (estimated December 2028)

Decision-curve analysis with patient-level bootstrap (1000 resamples) comparing three strategies (combined biopsy for all; targeted biopsy alone; Positive-then-Stop) across threshold probabilities.
Simulation performed after database lock (estimated December 2028)
Inter-reader agreement of index-test readings
Délai: Video re-reading after completion of enrolment (estimated 2028)

Cohen's kappa (three-tier scale and dichotomised Category 1 vs 0/2) and percent agreement between two blinded technicians re-interpreting a random 20% subset of archived scan videos (~900-1200 cores).
Video re-reading after completion of enrolment (estimated 2028)
Tissue-integrity (tissue-compromise) rate
Délai: Day 7-14 (pathology reporting)

Proportion of cores flagged by uropathologists as degraded, unreadable, or inadequate for definitive H&E/IHC evaluation attributable to the staining/scanning procedure; one-sided upper 95% confidence bound compared against the 1% acceptability benchmark.
Day 7-14 (pathology reporting)
Operational performance of the index test
Délai: Day 0

Per-core scanning time, extraction-to-fixation interval, equivocal (Category 2) rate, and device/scan failure rate, summarised descriptively by centre and calendar quarter.
Day 0

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Shanghai East Hospital

Les enquêteurs

  • Chaise d'étude: haifeng wang, Changhai Hospital

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 décembre 2026

Achèvement primaire (Estimé)

1 décembre 2028

Achèvement de l'étude (Estimé)

1 janvier 2029

Dates d'inscription aux études

Première soumission

23 septembre 2026

Première soumission répondant aux critères de contrôle qualité

23 septembre 2026

Première publication (Réel)

29 septembre 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

29 septembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

23 septembre 2026

Dernière vérification

1 septembre 2026

Plus d'information

Termes liés à cette étude

Mots clés

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • 2026304

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

OUI

Description du régime IPD

De-identified participant-level data and the signed statistical analysis plan will be made available on reasonable request to the corresponding author, subject to a methodologically sound proposal and a signed data-access agreement.

Délai de partage IPD

Beginning 12 months after publication of the primary results, for a period of 5 years.

Critères d'accès au partage IPD

Proposals will be reviewed by the Trial Steering Committee; access requires approval and a data-access agreement.

Type d'informations de prise en charge du partage d'IPD

  • PROTOCOLE D'ÉTUDE
  • SÈVE

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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