Comparison Between White Light Endoscopy and Bright Narrow Band Imaging in Diagnosis Colonic Adenomas. (WLEvB-NBI)

Professor Michael Bourke

Status: Withdrawn

Conditions: Colonic Adenomas

Treatments: Other: White Light Endoscopy; Other: Bright Narrow Band Imaging.

Study type: Interventional

Funder types: Other

Identifiers

NCT01737567

HREC2011/12/4.9 (3395) (Other Identifier)

HREC/11/WMEAD/223

Details and patient eligibility

About

Removal of colorectal adenomas prevents the occurence of colorectal cancers. The use of chromo-endoscopy has been shown to improve the detection of flat adenomas. Narrow band imaging enables endoscopists to accurately describe the pit pattern of adenomas. By comparing White Light Endoscopy and Bright Narrow Band Imaging it will show if there is any comparable advantage to using one or the other for lesion detection and assessment.

Full description

Removal of colorectal adenomas prevents occurrence of cancers [1]. It is recognized that colonoscopy can miss colorectal adenomas and early cancers [2]. There is a need to further improve performance of colonoscopy. The use of chromoendoscopy has been shown to improve detection of flat adenomas [3]. Narrow band imaging was introduced in year 2006. It is similar to chromoendoscopy in that it provides more mucosal details. This enables endoscopists to accurately describe the pit pattern of adenomas. NBI has been used as a substitute to chromoendoscopy.

In pooled analysis, NBI is comparable to chromoendoscopy in their sensitivity and specificity in the diagnosis of malignant colorectal adenomas [4]. Unfortunately, the use of NBI has not been shown to conclusively improve rate of colorectal adenoma detection. Two of 3 randomized trials that compared WLE to NBI showed a higher adenoma detection rate with the use of NBI [5, 6]. In a study by Rex et al., the rate was however similar with either modality. In a pooled analysis, NBI was only marginally better than WLE [7].

The effective use of NBI depends on the quality of bowel preparation and the experience of endoscopist. In the presence of fecal matters, NBI tends to be dark and detection of small adenomas becomes difficult. The prototype bright NBI coupled with high definition resolution is likely to overcome this drawback of original NBI.

Sex: All

Ages: 50 to 99 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Asymptomatic subjects undergoing screening colonoscopy, age > 50, average risk subjects and, ability to provide a written consent to trial participation.

Exclusion criteria

• personal history of inflammatory bowel disease, colon adenoma or cancer
• family history of FAP or Familial nonpolyposis syndrome
• first degree relatives having diagnosed to have colorectal carcinoma
• no colonoscopy in past 5 years

Trial design

Primary purpose: Screening

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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0 participants in 2 patient groups

Bright Narrow Band Imaging

Experimental group

Description:

Use of B-NBI to detect colonic adenomas.

Treatment:

Other: Bright Narrow Band Imaging.

White Light Endoscopy

Active Comparator group

Description:

Use of White Light Endoscopy to detect colonic adenomas.

Treatment:

Other: White Light Endoscopy