Real-world experience with Curcumin–QingDai combination for patients with active ulcerative colitis: A retrospective multicentre cohort study

Background: Curcumin and QingDai (QD, Indigo) have been shown to be effective for treating active ulcerative colitis (UC). Aim: To evaluate the real-world experience with the Curcumin–QingDai (CurQD) herbal combination to induce remission in active UC. Methods: A retrospec‑tive multicentre adult cohort study from five tertiary academic centres (2018–2022). Active UC was defined as a Simple Clinical Colitis Activity Index (SCCAI) ≥ 3. Patients were induced by CurQD. The primary outcome was clinical remission at weeks 8–12, defined as SCCAI ≤2 and a decrease ≥3 points from baseline. Secondary outcomes were clinical response (SCCAI decrease ≥3 points), corticosteroid-free remission, faecal calprotectin (FC) response (reduction ≥50%), FC normalisation (FC ≤100 μg/g for patients with FC ≥300 μg/g at baseline), and safety. All outcomes were analysed for patients who were maintaining stable treatment. Results: Eighty-eight patients were included; 50% were biologics/small molecules experienced, and 36.5% received ≥2 biologics/small molecules. Clinical remission was achieved in 41 (46.5%), and clinical response in 53 (60.2%). Median SCCAI decreased from 7 (IQR:5–9) to 2 (IQR:1–3); p < 0.0001. Of the 26 patients on corticosteroids at baseline, seven achieved corticosteroid-free remission. Among 43 biologics/small molecules experienced patients, clinical remission was achieved in 39.5% and clinical response in 58.1%. FC normalisation and response were achieved in 17/29 and 27/33, respectively. Median FC decreased from 1000 μg/g (IQR:392–2772) at baseline to 75 μg/g (IQR:12–136) at the end of inductions (n = 30 patients with paired samples); p < 0.0001. No overt safety signals emerged. Conclusion: In this real-world cohort, CurQD effectively induced clinical and biomarker remission in patients with active UC, including patients who were biologics/small molecules experienced.