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Narrow band imaging optical diagnosis of small colorectal polyps in routine clinical practice: the Detect Inspect Characterise Resect and Discard 2 (DISCARD 2) study

Rees, C.J.; Rajasekhar, P.T.; Wilson, A.; Close, H.; Rutter, M.D.; Saunders, B.P.; East, J.E.; Maier, R.H.; Moorghen, M.; Muhammad, U.; Hancock, H.C.; Jayaprakash, A.; MacDonald, C.; Ramadas, A.; Dhar, A.; Mason, J.M.

Narrow band imaging optical diagnosis of small colorectal polyps in routine clinical practice: the Detect Inspect Characterise Resect and Discard 2 (DISCARD 2) study Thumbnail


Authors

C.J. Rees

P.T. Rajasekhar

A. Wilson

H. Close

M.D. Rutter

B.P. Saunders

J.E. East

R.H. Maier

M. Moorghen

U. Muhammad

H.C. Hancock

A. Jayaprakash

C. MacDonald

A. Ramadas

A. Dhar

J.M. Mason



Abstract

Background Accurate optical characterisation and removal of small adenomas (<10 mm) at colonoscopy would allow hyperplastic polyps to be left in situ and surveillance intervals to be determined without the need for histopathology. Although accurate in specialist practice the performance of narrow band imaging (NBI), colonoscopy in routine clinical practice is poorly understood. Methods NBI-assisted optical diagnosis was compared with reference standard histopathological findings in a prospective, blinded study, which recruited adults undergoing routine colonoscopy in six general hospitals in the UK. Participating colonoscopists (N=28) were trained using the NBI International Colorectal Endoscopic (NICE) classification (relating to colour, vessel structure and surface pattern). By comparing the optical and histological findings in patients with only small polyps, test sensitivity was determined at the patient level using two thresholds: presence of adenoma and need for surveillance. Accuracy of identifying adenomatous polyps <10 mm was compared at the polyp level using hierarchical models, allowing determinants of accuracy to be explored. Findings Of 1688 patients recruited, 722 (42.8%) had polyps <10 mm with 567 (78.5%) having only polyps <10 mm. Test sensitivity (presence of adenoma, N=499 patients) by NBI optical diagnosis was 83.4% (95% CI 79.6% to 86.9%), significantly less than the 95% sensitivity (p<0.001) this study was powered to detect. Test sensitivity (need for surveillance) was 73.0% (95% CI 66.5% to 79.9%). Analysed at the polyp level, test sensitivity (presence of adenoma, N=1620 polyps) was 76.1% (95% CI 72.8% to 79.1%). In fully adjusted analyses, test sensitivity was 99.4% (95% CI 98.2% to 99.8%) if two or more NICE adenoma characteristics were identified. Neither colonoscopist expertise, confidence in diagnosis nor use of high definition colonoscopy independently improved test accuracy. Interpretation This large multicentre study demonstrates that NBI optical diagnosis cannot currently be recommended for application in routine clinical practice. Further work is required to evaluate whether variation in test accuracy is related to polyp characteristics or colonoscopist training. Trial registration number The study was registered with clinicaltrials.gov (NCT01603927).

Citation

Rees, C., Rajasekhar, P., Wilson, A., Close, H., Rutter, M., Saunders, B., …Mason, J. (2017). Narrow band imaging optical diagnosis of small colorectal polyps in routine clinical practice: the Detect Inspect Characterise Resect and Discard 2 (DISCARD 2) study. Gut, 66(5), 887-895. https://doi.org/10.1136/gutjnl-2015-310584

Journal Article Type Article
Acceptance Date Jan 20, 2016
Online Publication Date Apr 19, 2016
Publication Date May 1, 2017
Deposit Date Jun 1, 2016
Publicly Available Date Mar 28, 2024
Journal Gut
Print ISSN 0017-5749
Electronic ISSN 1468-3288
Publisher BMJ Publishing Group
Peer Reviewed Peer Reviewed
Volume 66
Issue 5
Pages 887-895
DOI https://doi.org/10.1136/gutjnl-2015-310584

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Publisher Licence URL
http://creativecommons.org/licenses/by-nc/4.0/

Copyright Statement
Advance online version This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/





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