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Implementation of Optical Diagnosis for Diminutive Polyps Amongst Endoscopists: Training and Long-term Quality Assurance (DISCOUNT2)

8. januar 2018 opdateret af: Prof. Evelien Dekker, MD, PhD, Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA)

Implementation of Optical Diagnosis for Diminutive Polyps Amongst Accredited Endoscopists for the Dutch Bowel Cancer Screening Program: Training and Long-term Quality Assurance

In this study, Dutch gastroenterologists who are certified for performing colonoscopies on FIT-positive patients in the Dutch population screening program are trained in optical diagnosis with validated methods. After this training, an ex- and in-vivo test phase leads to "accreditation" and endoscopists will be observed in their optical diagnosis for 1 year. During this year, half of the endoscopists will be randomized towards 3-monthly feedback and the other half will receive feedback on their results after 1 year. The endoscopic prediction of endoscopists on polyp histology will be compared to histopathological outcome.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Through the recently started nationwide bowel cancer screening programme in the Netherlands, an extra 70.000 colonoscopies are annually performed. In current practice, all resected colonic lesions are histopathologically analysed. Even diminutive polyps, which rarely harbour cancer or advanced histological features. If endoscopists are able to accurately differentiate between neoplastic and non-neoplastic lesions during colonoscopy, practice could become more efficient and costeffective. This strategy is called optical diagnosis and two clinical practice strategies have been proposed by the American Society of Gastroenterologists (ASGE). First, diminutive polyps could be resected and discarded if >90% of the surveillance intervals predicted on optical diagnosis correlate with the surveillance intervals after histopathological validation (if assessed with high confidence). Second, hyperplastic polyps in the rectosigmoid could be left in situ if endoscopists are able to confidently predict neoplastic histology of diminutive colorectal polyps with a negative predictive value (NPV) of ≥90%.

The accuracy of white light colonoscopy is not acceptable for daily practice (59%-84%), but narrow band imaging (NBI) allows higher accuracies up to 98% and it was demonstrated that experienced endoscopists could reach a NPV of ≥90% for diminutive colorectal lesions. However, recent research shows that community gastroenterologists are not able to meet the quality thresholds proposed by the ASGE. Before this strategy could be safely applied in daily practice, community gastroenterologists should be able to meet thresholds as well.

In this study, Dutch gastroenterologists who are certified for performing colonoscopies on FIT-positive patients in the Dutch population screening program, are trained in optical diagnosis with validated methods. After training, an ex- and in-vivo test phase leads to "accreditation" and endoscopists will be observed in their optical diagnosis for 1 year. During this year, half of the endoscopists will be randomized towards 3-monthly feedback and the other half will receive feedback on their results after 1 year. The endoscopic prediction of endoscopists on polyp histology will be compared to histopathological outcome.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

3144

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

      • Alkmaar, Holland
        • Medisch Centrum Alkmaar
      • Almere, Holland
        • Flevoziekenhuis
      • Amstelveen, Holland
        • Amstelland Ziekenhuis
      • Amsterdam, Holland
        • Onze Lieve Vrouwe Gasthuis
      • Amsterdam, Holland
        • Slotervaart Ziekenhuis
      • Amsterdam, Holland
        • Sint Lucas Andreas Ziekenhuis
      • Amsterdam, Holland
        • Antonie van Leeuwenhoek Ziekenhuis
      • Beverwijk, Holland
        • Rode Kruis Ziekenhuis
      • Haarlem, Holland
        • Kennemer Gasthuis
      • Hoofddorp, Holland
        • Spaarne Ziekenhuis
      • Hoorn, Holland
        • West Fries Gasthuis
      • Nieuwegein, Holland
        • Sint Antonius Ziekenhuis
      • Utrecht, Holland
        • Diakonessenhuis

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

55 år til 75 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Endoscopists certified for performing Dutch screening colonoscopies. Colonoscopies in patients performed after a positive FIT obtained for the Dutch colorectal cancer screening program.

Beskrivelse

Inclusion Criteria:

  • Colonoscopies performed in FIT positive patients obtained for the Dutch colorectal cancer screening program.

Exclusion Criteria:

  • Colonoscopies in patients with a history of colorectal cancer, inflammatory bowel disease or polyposis syndrome.
  • Colonoscopies in patients with bleeding disorders or anticoagulants and therefore cannot undergo polypectomy.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Endoscopists
Approximately 35 endoscopists whom are certified to perform colonoscopies on FIT-positive patients in the Dutch population screening program
3-monthly or no 3-monthly feedback on results of optical diagnosis
Colonoscopies
Colonoscopies on FIT-positive patients in the Dutch population screening program
Device
Olympus colonoscopes with Narrow Band Imaging

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
the number of training rounds needed until endoscopists reach a clinical acceptable accuracy of predicting histology of subcentimetric (1-9 mm) colorectal lesions using NBI
Tidsramme: 18 months
18 months
the number of qualified endoscopists that are able to maintain a clinical acceptable accuracy of predicting histology of subcentimetric (1-9 mm) colorectal lesions using NBI over a year, either with and without regular interim feedback.
Tidsramme: 18 months
18 months

Sekundære resultatmål

Resultatmål
Tidsramme
the number of the accredited endoscopists that is able to reach a negative predictive value of at least 90% for predicting neoplastic diminutive (1-5mm) and small (6-9mm) colorectal lesions in the rectosigmoid
Tidsramme: 18 months
18 months
the number of diminutive (1-5mm) and small (6-9mm) lesions that are correctly predicted with high confidence
Tidsramme: 18 months
18 months
the number of patients in whom a surveillance interval (according to the Dutch surveillance guideline) can be advised directly after colonoscopy, based on the endoscopic diagnosis
Tidsramme: 18 months
18 months
the number of patients in whom the surveillance interval (according to the Dutch surveillance guideline) is correctly predicted based on endoscopic diagnosis
Tidsramme: 18 months
18 months
the number of correctly diagnosed sessile serrated adenoma/polyps in diminutive (1-5mm) and small (6-9mm) polyps
Tidsramme: 18 months
18 months
the sensitivity for predicting neoplastic histology per endoscopist, time frame and feedback or no feedback group
Tidsramme: 18 months
18 months
the costs in euros that would have been saved by multiplying the amount of high confidence predicted diminutive and small polyps with the histopathology costs per lesion
Tidsramme: 18 months
18 months

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Efterforskere

  • Ledende efterforsker: Evelien Dekker, Prof. dr., e.dekker@amc.uva.nl

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

1. januar 2015

Primær færdiggørelse (Faktiske)

28. februar 2017

Studieafslutning (Faktiske)

1. januar 2018

Datoer for studieregistrering

Først indsendt

19. marts 2015

Først indsendt, der opfyldte QC-kriterier

31. marts 2015

Først opslået (Skøn)

3. april 2015

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

9. januar 2018

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

8. januar 2018

Sidst verificeret

1. januar 2018

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Andre undersøgelses-id-numre

  • W14_099
  • NTR4635 (Registry Identifier: The Netherlands National Trial Register)
  • FP 13 (Andet bevillings-/finansieringsnummer: Dutch Digestive Foundation)

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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