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Clinical characteristics of patients with difficult-to-treat ulcerative colitis: a nested case-control study using a
Katsuyoshi Matsuoka1, Ataru Igarashi2,3, Noriko Sato4
1Division of Gastroenterology and Hepatology, Department of Internal Medicine, Toho University Sakura Medical Center, Sakura, Japan.
Intestinal Research
|April 25, 2025
Summary
Difficult-to-treat ulcerative colitis (D2T UC) affects 16.7% of patients starting advanced therapy. High corticosteroid doses before treatment predict D2T UC, indicating a need for closer monitoring.
Area of Science:
- Gastroenterology
- Clinical Epidemiology
- Pharmacotherapy
Background:
- Advanced therapies have improved ulcerative colitis (UC) management.
- However, a subset of patients develops difficult-to-treat (D2T) UC.
- Understanding D2T UC characteristics is crucial for optimizing patient care.
Purpose of the Study:
- To define the epidemiological and clinical features of D2T UC.
- To identify predictors of D2T UC in patients initiating advanced therapy.
Main Methods:
- Nested case-control study utilizing a large claims database (January 2018-April 2023).
- Defined D2T UC as ≥2 advanced therapy switches or surgery within 2 years of first advanced therapy.
- 1:1 matching of D2T UC and non-D2T UC patients for analysis.
Main Results:
- 16.7% of UC patients initiating advanced therapy were classified as D2T UC.
- Higher baseline corticosteroid dose (≥30 mg/day) in the 6 months prior to advanced therapy was significantly associated with D2T UC.
- D2T UC patients had shorter durations of first advanced therapy and more frequent switches.
Conclusions:
- A significant proportion of UC patients develop D2T UC despite advanced therapies.
- Pre-initiation corticosteroid dosage is a key predictor of D2T UC.
- Identifying patients at risk for D2T UC early can guide treatment strategies.
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