Clinical trial NCT02138318: High Definition Versus Chromoendoscopy for Dysplasia Detection in Ulcerative Colitis (UC)
Official title: Randomized Controlled Trial of High Definition White Light Endoscopy Versus Chromoendoscopy for Dysplasia Detection in Ulcerative Colitis Surveillance
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Ulcerative Colitis
Lead sponsor: The Leeds Teaching Hospitals NHS Trust
Sponsor class: OTHER
First posted: 2014-05-14
Enrollment: 152
Sex: ALL
Minimum age (years): 18
Maximum age (years): 100
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

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.


Eligibility criteria: 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)

Primary outcomes:
measure: number of lesions
timeFrame: Once annually at routine clinical assessment
Secondary outcomes:
Other outcomes:
Locations:
city: Leeds
country: United Kingdom
facility: Leeds Teaching Hospitals NHS Trust
state: West Yorkshire
Study officials:
References: