What is the evidence that chromoendoscopy reduces CRC incidence in UC compared with standard surveillance protocols

What is known

- A meta-analysis of 17 RCTs (2,457 patients) found dye-chromoendoscopy superior to standard-definition white-light endoscopy, but no difference versus high-definition white-light endoscopy. ¹ - Studies on chromoendoscopy primarily focus on dysplasia detection; its impact on reducing CRC incidence and mortality remains difficult to quantify. ² - The 2015 SCENIC consensus recommends chromoendoscopy over standard-definition white-light endoscopy for surveillance in ulcerative colitis. ^3,4 - A large retrospective study reported chromoendoscopy did not increase neoplasia detection versus conventional colonoscopy with random biopsies. ⁵

What is unknown / caveats

- Retrospective study found no increased neoplasia detection with chromoendoscopy ⁵ - Ongoing debate and conflicting data on preferred surveillance modality ⁴ - Endpoints are dysplasia detection, not CRC incidence or mortality - RCT superiority is only against standard-definition, not high-definition, white light - No excerpt reports a trial demonstrating that chromoendoscopy directly lowers CRC incidence or mortality compared with standard surveillance.

## References

1. Resende RH, Ribeiro IB, de Moura DTH, Galetti F, Rocha RSP, Bernardo WM, Sakai P, de Moura EGH. Surveillance in inflammatory bowel disease: is chromoendoscopy the only way to go? A systematic review and meta-analysis of randomized clinical trials. Endosc Int Open. 2020. PMID: 32355874.

2. Fasulo E, D'Amico F, Zilli A, Furfaro F, Cicerone C, Parigi TL, Peyrin-Biroulet L, Danese S, Allocca M. Advancing Colorectal Cancer Prevention in Inflammatory Bowel Disease (IBD): Challenges and Innovations in Endoscopic Surveillance. Cancers (Basel). 2024. PMID: 39796690.

3. Kisiel JB, Konijeti GG, Piscitello AJ, Chandra T, Goss TF, Ahlquist DA, Farraye FA, Ananthakrishnan AN. Stool DNA Analysis is Cost-Effective for Colorectal Cancer Surveillance in Patients With Ulcerative Colitis. Clin Gastroenterol Hepatol. 2016. PMID: 27464589.

4. Clarke WT, Feuerstein JD. Colorectal cancer surveillance in inflammatory bowel disease: Practice guidelines and recent developments. World J Gastroenterol. 2019. PMID: 31435169.

5. Stidham Ryan W, Higgins Peter DR. Colorectal Cancer in Inflammatory Bowel Disease. Clin Colon Rectal Surg. 2018;31(3):168-178. PMID: 29720903.

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_Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct._