In indeterminate colitis diagnosed by endoscopy and biopsy, does anti-TNF therapy lead to a higher rate of sustained clinical remission at one year than immunomodulators (azathioprine or 6-MP)

What is known

- Indeterminate colitis is usually treated with standard ulcerative colitis therapies including mesalamine, corticosteroids, azathioprine or mercaptopurine, and biologics; controlled trials are scarce due to diagnostic uncertainty and small numbers. ¹ - A retrospective series of 20 patients with medically refractory indeterminate colitis reported a complete response in 14 (70%) treated with infliximab, but this was uncontrolled and not a one-year remission comparison. ^1,2 - In broader IBD, azathioprine and 6-MP are established for maintaining remission and were more effective than placebo at sustaining remission over one year in Crohn's disease, but these data are not specific to indeterminate colitis. ^3,4

What is unknown / caveats

- No head-to-head anti-TNF vs immunomodulator trial in indeterminate colitis - Available IC-specific data are small retrospective/uncontrolled series - Much cited efficacy data are for CD/UC, not IC specifically - The excerpts provide no direct comparative or one-year sustained-remission data for anti-TNF versus immunomodulators in indeterminate colitis.

## References

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

2. Papadakis KA, Treyzon L, Abreu MT, Fleshner PR, Targan SR, Vasiliauskas EA. Infliximab in the treatment of medically refractory indeterminate colitis. Aliment Pharmacol Ther. 2003;18(7):741-7. PMID: 14510748.

3. Vucelic B. [Therapy of inflammatory bowel disease]. Med Arh. 2002;56(1 Suppl 1):37-45. PMID: 12055723.

4. Willot S, Noble A, Deslandres C. Methotrexate in the treatment of inflammatory bowel disease: an 8-year retrospective study in a Canadian pediatric IBD center. Inflamm Bowel Dis. 2011;17(12):2521-6. PMID: 21337668.

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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._