In adults with indeterminate colitis and persistent symptoms despite optimized mesalamine, is colectomy or anti-TNF therapy preferred

What is known

- A retrospective study reported improvement in 16 of 20 patients with medically refractory indeterminate colitis treated with infliximab. ¹ - Indeterminate colitis is usually treated with standard ulcerative colitis therapies, including mesalamine, corticosteroids, thiopurines, and biologics. ¹ - After IPAA, indeterminate colitis patients had significantly more pelvic sepsis, pouch fistula, and pouch failure at 10 years than ulcerative colitis patients. ¹ - Infliximab has been reported in indeterminate colitis both as refractory-disease treatment and as rescue medication in severe disease refractory to tacrolimus. ^2,3

What is unknown / caveats

- No head-to-head or comparative data on colectomy vs anti-TNF for indeterminate colitis in these excerpts - Infliximab evidence is retrospective/open-label with small numbers, not controlled trials - No clinical trials specific to indeterminate colitis noted, partly due to diagnostic uncertainty and small patient numbers - The evidence cannot rank colectomy against anti-TNF for this decision because no direct comparison was retrieved.

## References

1. Tremaine WJ. Is indeterminate colitis determinable?. Curr Gastroenterol Rep. 2012;14(2):162-5. PMID: 22314810.

2. Tremaine WJ. Review article: Indeterminate colitis--definition, diagnosis and management. Aliment Pharmacol Ther. 2007;25(1):13-7. PMID: 17229217.

3. Venkateswaran N, Weismiller S, Clarke K. Indeterminate Colitis - Update on Treatment Options. J Inflamm Res. 2021;14:6383-6395. PMID: 34876831.

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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._