P943 Real world Effectiveness and safety of tofacitinib in patients with Ulcerative Colitis: 6 months follow-up of the French TOFAST study

Abstract Background TOFAST is an observational, prospective, multicenter cohort study aiming to describe the real-life clinical benefit of tofacitinib in moderate-to-severe Ulcerative Colitis (UC). Methods We report the results of the interim analysis after 6 months of follow-up, describing patient's characteristics, effectiveness, including change in daily PRO2 scores [RB and stool frequency (SF)] during the first 14 days and the median time to relief, and safety. Clinical response was defined as a decrease in partial Mayo score (PMS) (≥ 3 points and ≥30%) from inclusion with a concomitant decrease in rectal bleeding (RB) subscore ≥ 1 point (absolute subscore of 0 or 1). Clinical remission was defined as PMS ≤2 with no subscore >1. Symptomatic relief was reported by patients as the time in days from initiation of tofacitinib to improvement of their symptoms. Safety has been been reported as the % of Adverse Events (AE), serious AE and AE of special interest. Results 88 patients were included in the safety analysis (one patient was excluded from the effectiveness analysis as he did not meet the eligibility criteria) with a median exposure duration of 11.7 [Q1; Q3: 6.0; 22.1] months. Of these patients, 67 completed a 6-month follow-up visit by 15/07/2023 and were included in the effectiveness analysis. At inclusion 59.8% of patients were male with a mean (± SD) age of 37.5 ±13.2 years, a median disease duration of 5.9 years [Q1; Q3: 2.7; 13.1]. 46.5% of patients had pancolitis. The mean total Mayo Score was 8.1 ±2.4. 94.3% of patients had previously received at least one anti-TNF agent, 67.8% vedolizumab and 35.6% ustekinumab. Tofacitinib was initiated at 10 mg b.i.d, in combination with corticosteroids for 35.6% of patients. At 6 months, 53 (77.9%) patients were still treated with tofacitinib, 58.5% at 10 mg BID dose. Corticosteroids were ongoing in 22.9% of patients. Clinical response and remission were observed in 64.2% and 61.2% of patients, respectively. For the 68 (78.2%), patients who reported improvement the median time to relief was 7 days [Q1; Q3: 3.5 ;14.5]. PRO2 scores normalization during the first 14 days is shown in the figure. 84.1% of patients reported at least one adverse event (AE) and 21.6% reported at least one serious AE. Seventeen (19.3%) infections and 3 (3.4%) cases of herpes zoster were observed as well as one non-invasive low-grade urothelial carcinoma. No major cardiovascular or venous thromboembolic event, nor malignancy or death were observed (Table). Conclusion In this real-life cohort of patients with refractory UC, tofacitinib induced a clinical response and remission in over 60% of patients, with symptoms relief observed as early as the first two weeks. AEs were consistent with the known tofacitinib safety profile.