High Definition Versus Chromoendoscopy for Dysplasia Detection in Ulcerative Colitis (UC)

Not Applicable

Completed

• Conditions: Ulcerative Colitis
• Interventions: Other: chromoendoscopy; Other: High definition (HD) endoscopy

• Registration Number: NCT02138318
• Lead Sponsor: The Leeds Teaching Hospitals NHS Trust

Brief Summary

Patients with ulcerative colitis (UC) have an increased risk for colorectal cancer (CRC) compared to the general population. Regular screening by colonoscopy is an internationally recommended cancer prevention strategy. Random sampling of the mucosa throughout the colon has been the mainstay of conventional surveillance practice to detect abnormalities, known as dysplasia which can progress to CRC. This requires multiple biopsies, to be taken and processed, a practice which is is tedious, expensive, time consuming and has a low pickup rate. Dysplasia in UC is typically flat and patchy and can be easily overlooked with standard conventional white light colonoscopy (WLC).

Detection can be improved by the application of dyes which highlight more subtle abnormalities. This practice, known as chromoendoscopy (CE) is better than WLC at dysplasia detection but more time consuming for the patient and cannot guarantee that the whole colon is covered. CE has only been compared in clinical trials with standard definition endoscopy rather than the recently available high definition endoscopes with better resolution and picture. High definition (HD) endoscopy uses a high definition onitor and a high resolution CCD (charge coupled device) providing much better images than standard video endoscopy. HD colonoscopy promises therefore to provide an alternative to CE in UC surveillance without the need for the extra time and experience required for dye spraying for both endoscopists and nursing staff.

The investigators plan to do a randomized trial to assess HD colonoscopy alone compared to chromoendoscopy (with HD colonoscopies) for dysplasia detection during surveillance for ulcerative colitis. There have been no trials comparing these two modalities and the investigators hope to provide evidence that the additional benefit of CE over HD colonoscopy would be marginal and therefore CE would be reserved for procedures using standard definition scopes.

Detailed Description

Not available

Study Timeline

• Study Start: 2012-05-01
• Study First Submitted: 2014-04-01
• Study First Submitted QC: 2014-05-13
• Study First Posted: 2014-05-14
• Primary Completion: 2015-09-19
• Study Completion: 2015-09-19
• Status Verified: 2019-08
• Last Update Submitted: 2019-08-16
• Last Update Posted: 2019-08-20

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 152

Inclusion Criteria

• Patients with longstanding (more than 10 years), extensive (extending proximal to the splenic flexure) colitis attending for surveillance colonoscopy.
• Patients over 18 years of age

Exclusion Criteria

• Pregnancy
• Unwilling or unable to give informed consent
• Severe active colitis (as assessed by the endoscopist)

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
chromoendoscopy	chromoendoscopy	-
High definition (HD) endoscopy	High definition (HD) endoscopy	-

Primary Outcome Measures

Name	Time	Method
number of lesions	Once annually at routine clinical assessment	The number of lesions with at least low grade dysplasia detected by targeted biopsy to be compared between the two groups by chisquared test.

Trial Locations

Locations (1)

Leeds Teaching Hospitals NHS Trust; 🇬🇧 Leeds, West Yorkshire, United Kingdom