Linked Color Imaging Versus Narrow Band Imaging for Colorectal Adenoma Detection

Not Applicable

Completed

• Conditions: Colon Adenoma
• Interventions: Diagnostic Test: Tandem colonoscopy

• Registration Number: NCT03336359
• Lead Sponsor: The University of Hong Kong

Brief Summary

This is a prospective randomized trial comparing the adenoma detection rate of LCI with NBI. Eligible patients are randomly allocated in a 1:1 ratio to undergo tandem colonoscopy with LCI (LCI group) or NBI (NBI group). Randomization will be carried out by computer generated random sequences and stratified according to endoscopist's experiences (experienced versus fellows) and indications of colonoscopy (symptomatic vs screening/surveillance).

The primary outcome of this study is to compare the adenoma or polyp detection rates by LCI and NBI during the first examination. Secondary outcomes included adenoma/polyp miss rate by LCI or NBI. Other outcomes include sessile serrated adenomas or polyps (SSA/P) detection rates and advanced adenoma detection rates.

Detailed Description

Study design and randomization:

This is a prospective randomized head-to-head trial comparing the adenoma detection rate of LCI with NBI. Eligible patients are randomly allocated in a 1:1 ratio to undergo tandem colonoscopy with LCI (LCI group) or NBI (NBI group). Randomization will be carried out by computer generated random sequences and stratified according to endoscopist's experiences (experienced versus fellows) and indications of colonoscopy (symptomatic vs screening/surveillance). All procedures are performed with high-definition endoscopes and the LASEREO endoscopic system (Fujifilm Co, Tokyo, Japan) or the EVIS- EXERA 290 video system (Olympus Optical, Tokyo, Japan).

Colonoscopy:

Patients are instructed to take low-residue diet two days before colonoscopy. Oral polyethylene glycol lavage solution is used for bowel preparation (routine bowel preparation). The assigned endoscopic system will be used and the colonoscope will advance to cecum under WL in all patients. Cecal intubation is confirmed by identification of the appendiceal orifice and ileocecal valve or by intubation of the ileum. Once cecal intubation is performed, the colonoscope is withdrawn to the anus under LCI or NBI accordingly. All detected polyps will be removed during this examination. The withdrawal time of the first pass (minus the polypectomy site) will be measured by a stopwatch.

The size (measured with biopsy forceps), location, and morphology of polyps are recorded by an independent observer. The Boston Bowel Preparation Scale score is evaluated during examination.

Immediately after the first pass examination, a second examination will be performed by the same colonoscope and the same endoscopist. The colonoscope will be reintroduced to the cecum using WL and withdraw using the previously assigned method (ie LCI or NBI). Any polyp detected on second pass examination will be removed and the withdrawal time of the second pass will also be documented. All polyp specimens are clearly labelled for histological examination.

Histologic examination All resected and biopsy specimens are fixed in 10% buffered formalin solution, and examined histologically by hematoxylin and eosin staining. The histopathological diagnosis is determined by experienced pathologists, who are blinded to the assigned endoscopic system, according to the World Health Organization (WHO) criteria.Advanced adenomas are defined as adenoma ≥10 mm in diameter or with villous histology in 25% or high-grade dysplasia (HGD), or carcinoma.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2017-10-23
• Study First Submitted: 2017-11-05
• Study First Submitted QC: 2017-11-05
• Study First Posted: 2017-11-08
• Primary Completion: 2018-09-20
• Study Completion: 2018-12-31
• Status Verified: 2019-04
• Last Update Submitted: 2019-04-15
• Last Update Posted: 2019-04-17

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 272

Inclusion Criteria

• Consecutive adult patients undergoing outpatient colonoscopy
• aged 40 or above

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Exclusion Criteria

• unable to provide informed consent
• have undergone previous colorectal resection
• personal history of colorectal cancer, inflammatory bowel disease, familial adenomatous polyposis, Peutz-Jeghers syndrome, or other polyposis syndromes
• considered to be unsafe for polypectomy including patients with bleeding tendency and those with severe comorbid illnesses
• cecum could not be intubated for various reasons or due to poor bowel preparation

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
NBI	Tandem colonoscopy	Tandem colonoscopy with Narrow band imaging system
LCI	Tandem colonoscopy	Tandem colonoscopy with Linked Color Imaging system

Primary Outcome Measures

Name	Time	Method
Adenoma/polyp detection rate	first-pass colonoscopy	Percentage of patients with adenoma/polyp detected

Secondary Outcome Measures

Name	Time	Method
Adenoma/polyp miss rate	second-pass colonoscopy	percentage of patients with adenoma/polyp missed

Trial Locations

Locations (1)

Queen Mary Hospital; 🇨🇳 Hong Kong, China