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

23 de setembro de 2026 atualizado por: 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.

Visão geral do estudo

Status

Ainda não está recrutando

Condições

Intervenção / Tratamento

Descrição detalhada

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.

Tipo de estudo

Observacional

Inscrição (Estimado)

450

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

Estude backup de contato

  • Nome: haifeng wang
  • Número de telefone: 86-13681750891
  • E-mail: 190589109@qq.com

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

40 anos e mais velhos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Macho

Método de amostragem

Amostra de Probabilidade

População do estudo

patients who suspected to have prostate cancer

Descrição

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.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Modelos de observação: COHORT
  • Perspectivas de Tempo: PROSPECTIVE

Coortes e Intervenções

Grupo / Coorte
Intervenção / Tratamento
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.

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.

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Patient-level sensitivity of the EndoScell system for clinically significant prostate cancer
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Core-level diagnostic concordance
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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)
Prazo: 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
Prazo: 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
Prazo: 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
Prazo: 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

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Investigadores

  • Cadeira de estudo: haifeng wang, Changhai Hospital

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Estimado)

1 de dezembro de 2026

Conclusão Primária (Estimado)

1 de dezembro de 2028

Conclusão do estudo (Estimado)

1 de janeiro de 2029

Datas de inscrição no estudo

Enviado pela primeira vez

23 de setembro de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

23 de setembro de 2026

Primeira postagem (Real)

29 de setembro de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

29 de setembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

23 de setembro de 2026

Última verificação

1 de setembro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • 2026304

Plano para dados de participantes individuais (IPD)

Planeja compartilhar dados de participantes individuais (IPD)?

SIM

Descrição do plano 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.

Prazo de Compartilhamento de IPD

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

Critérios de acesso de compartilhamento IPD

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

Tipo de informação de suporte de compartilhamento de IPD

  • PROTOCOLO DE ESTUDO
  • SEIVA

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .