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Development of a New Simplified Tool to Predict LNPCPs Histology and Assess the Risk of Submucosal Invasive Cancer. The Colorectal Regular-Irregular Score (CRIS)

7 mei 2026 bijgewerkt door: University Hospital, Ghent

Colorectal cancer (CRC) is the third most common malignancy worldwide and the second leading cause of cancer related death. It can be prevented by endoscopic detection and complete resection of colorectal polyps. The JNET (Japanese NBI Expert Team) classification is clinically useful to predict the histology of large non-pedunculated colorectal polyps (LNPCPs) using narrow-band imaging at endoscopy. Japanese experts can reliably predict histology including the presence and depth of submucosal invasive cancer (SMI) using JNET with accuracy >87%. On the other hand, the International Evaluation of Endoscopy classification-JNET (IEE-JNET) group demonstrated that ESGE and JGES endoscopists had sufficient accuracy for JNET 1 (93.0%) but insufficient accuracy for JNET 2A/B and 3 (respectively 62.1%, 55.1% and 85.1%). Reliably distinguishing between JNET 2A, 2B and 3 has a profound clinical relevance, since JNET 2A lesions can safely be resected using pEMR whereas JNET 2B lesions should be resected en-bloc (EMR or ESD) due to the increased risk of cancer and JNET 3 lesions are preferably treated with surgery due to the high risk of deeply invasive carcinoma and the necessity of lymph node resection.

This study aims to validate a new simplified score, the Colorectal Regular-Irregular Score (CRIS) to fulfill the urgent need for a more effective and easier to use tool to predict LNPCPs histology. CRIS is a simplification of the JNET score which is mainly used by Japanese endoscopists or experts, recent evidence suggests its accuracy when used in everyday endoscopy in the Western world is insufficient. The investigators aim to compare JNET with CRIS for LNPCPs histology prediction amongst Western endoscopists using both original JNET interpretation and a clinically relevant approach.

The study consists of three work packages (WPs):

Work package one involves an expert online study where twelve expert endoscopists will evaluate 32 high-quality images of colorectal polyps using both JNET and CRIS classifications. Work package two involves an image/video-based online study where non-expert participants will be randomly assigned to rate images and videos using either JNET or CRIS, with performance re-evaluated after three months. Work package three involves a clinical study in a live endoscopy environment where non-expert endoscopists will participate in a randomized controlled trial assessing 10 colorectal polyps using either JNET or CRIS.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Studietype

Ingrijpend

Inschrijving (Geschat)

764

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Locaties

  • België
      • Ghent, België, 9000
        • UZ Gent

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Volwassen
  • Oudere volwassene

Accepteert gezonde vrijwilligers

Nee

Beschrijving

Inclusion Criteria:

  • Consenting Endoscopists of varying abilities and grades (endoscopist)
  • Endoscopists who did not previously encounter the score (endoscopist)
  • LNPCPs detected or referred for resection (patient)

Exclusion Criteria:

  • Endoscopist does not consent to inclusion (endoscopist)
  • Video of inadequate quality as per opinion of the principal investigator
  • Endoscopist does not undergo learning intervention (endoscopist)
  • Patient does not consent to data collection for the study (patient)

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Diagnostisch
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Crossover-opdracht
  • Masker: Geen (open label)

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Actieve vergelijker: JNET Classification Training (Active Comparator)
Ander: Learning tool (JNET/CRIS)
Participants will follow a 5-minute learning video (intervention) on JNET and later for CRIS.
Experimenteel: CRIS Classification Training (Experimental)
Ander: Learning tool (CRIS/JNET)
Participants will follow a 5-minute learning video (intervention) on CRIS and later for JNET.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Diagnostic Accuracy of CRIS Classification for Submucosal Invasive Carcinoma (Sensitivity, Specificity, and Overall Accuracy)
Tijdsspanne: Immediately after 5-minute training and rating of 32 images (approximately 1 hour per participant)
Sensitivity, specificity, and overall diagnostic accuracy of the CRIS classification for predicting submucosal invasive carcinoma compared with histopathological evaluation (reference standard). Accuracy is calculated as the proportion of correct classifications (true positives + true negatives) divided by total assessments. Results will be reported with 95% confidence intervals.
Immediately after 5-minute training and rating of 32 images (approximately 1 hour per participant)

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Diagnostic Accuracy of CRIS Versus JNET Among Expert Endoscopists (Sensitivity, Specificity, Overall Accuracy)
Tijdsspanne: At completion of expert image rating (approximately 30 minutes per expert)
Comparison of sensitivity, specificity, and overall diagnostic accuracy between CRIS and JNET classifications among 12 expert endoscopists rating 32 polyp images. Accuracy calculated as proportion of correct histopathology predictions. Results reported with 95% confidence intervals.
At completion of expert image rating (approximately 30 minutes per expert)
Diagnostic Accuracy of CRIS Versus JNET Across All Participant Categories (Sensitivity, Specificity, Overall Accuracy)
Tijdsspanne: Through study completion, an average of 3 years
Comparison of sensitivity, specificity, and overall diagnostic accuracy between CRIS and JNET classifications across all participant categories (experts, consultants, trainees, medical students, endoscopy nurses). Accuracy calculated as proportion of correct histopathology predictions using generalized linear mixed model analysis.
Through study completion, an average of 3 years
Change in Diagnostic Accuracy From Baseline to 3-Month Follow-up for CRIS Versus JNET (Sensitivity, Specificity, Overall Accuracy)
Tijdsspanne: 3 months after initial assessment
Change in sensitivity, specificity, and overall diagnostic accuracy from immediate post-training assessment to 3-month delayed assessment for participants using CRIS versus JNET. Reported as absolute change in accuracy with 95% confidence intervals. A smaller decrease indicates better retention of classification skills.
3 months after initial assessment
Inter-observer Agreement for Polyp Classification Using CRIS Versus JNET (Fleiss' Kappa Coefficient)
Tijdsspanne: At completion of baseline image assessment (approximately 1 hour per participant)
Inter-observer agreement among non-expert endoscopists for polyp classification using CRIS versus JNET, measured using Fleiss' kappa coefficient. Values interpreted as: <0.20 poor, 0.21-0.40 fair, 0.41-0.60 moderate, 0.61-0.80 substantial, 0.81-1.00 almost perfect agreement.
At completion of baseline image assessment (approximately 1 hour per participant)
Correlation Between Proposed Endoscopic Treatment and CRIS/JNET Classification (Percentage Agreement)
Tijdsspanne: At completion of baseline image/video assessment (approximately 1 hour per participant)
Percentage of cases where the proposed endoscopic treatment (piecemeal EMR, en-bloc EMR/ESD, or surgical referral) aligns with the guideline-recommended treatment based on CRIS or JNET classification. Higher agreement indicates the classification effectively guides treatment selection.
At completion of baseline image/video assessment (approximately 1 hour per participant)
Change in CRIS/JNET Diagnostic Accuracy Following 5-Minute Structured Learning Intervention (Pre-Post Difference in Overall Accuracy)
Tijdsspanne: Immediately before and immediately after 5-minute learning video intervention (within a single 1-hour session)
Change in overall diagnostic accuracy from pre-intervention baseline to immediately post-intervention for CRIS and JNET classifications. Reported as absolute difference in accuracy percentage with 95% confidence intervals. The CRIS/JNET classification uses a scale where accuracy ranges from 0% (no correct classifications) to 100% (all classifications correct), with higher scores indicating better diagnostic performance.
Immediately before and immediately after 5-minute learning video intervention (within a single 1-hour session)

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

University Hospital, Ghent

Onderzoekers

  • Hoofdonderzoeker: David Tate, University Hospital, Ghent

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 juli 2026

Primaire voltooiing (Geschat)

31 december 2028

Studie voltooiing (Geschat)

31 december 2028

Studieregistratiedata

Eerst ingediend

14 augustus 2025

Eerst ingediend dat voldeed aan de QC-criteria

7 mei 2026

Eerst geplaatst (Werkelijk)

13 mei 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

13 mei 2026

Laatste update ingediend die voldeed aan QC-criteria

7 mei 2026

Laatst geverifieerd

1 mei 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • ONZ-2024-0023

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Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

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Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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