OP03 Efficacy and safety of the oral selective sphingosine-1-phosphate-1 receptor modulator VTX002 in moderately to severely active Ulcerative Colitis: results from a randomised, double-blind, placebo-controlled, phase 2 trial

Abstract Background VTX002 is a novel oral selective sphingosine-1-phosphate-1 (S1P1) receptor modulator in development for the treatment of ulcerative colitis (UC). The efficacy and safety of VTX002 in patients with ulcerative colitis (UC) was assessed in a phase 2, multicentre, randomised, double-blind, placebo-controlled study (NCT05156125). Methods Adults (N=213) with moderately to severely active UC (modified Mayo score [MMS] 4-9) and inadequate response/intolerance to conventional and/or advanced (approved biologics or Janus kinase inhibitor) therapies were randomised 1:1:1 to once daily treatment with placebo (n=70), 30 mg (n=73) or 60 mg (n=70) VTX002 tablets for 13 weeks. Patients underwent a 6–8-day dose titration up to the assigned treatment dose. The primary endpoint was clinical remission (MMS stool frequency subscore ≤ 1, rectal bleeding subscore=0, and endoscopic subscore [ES] ≤ 1) at week 13. A protocol amendment limiting eligibility to patients with baseline MMS 5-9 resulted in 213 and 209 patients in the safety and efficacy populations, respectively. Key secondary endpoints were endoscopic improvement, symptomatic remission, histologic remission, and endoscopic improvement-histologic remission. Endoscopic remission and histologic-endoscopic mucosal improvement (HEMI) were also assessed (see Table 1 for outcome definitions). Adverse events (AEs) and laboratory abnormalities were assessed for safety. Results The primary endpoint of clinical remission at week 13 was achieved (27.9% of patients who received VTX002 60 mg vs 11.4% of patients who received placebo, ∆=16.5%, p=0.0184). Both doses of VTX002 achieved nominal statistical significance for all key secondary endpoints (Table 1). Significantly greater proportions of patients who received VTX002 60 mg achieved endoscopic remission and HEMI compared to patients who received placebo (29.4% VTX002 60 mg vs 7.1% placebo, ∆=22.3%, p=0.0012, and 32.4% VTX002 60 mg vs 10.0% placebo, ∆=22.4%, p=0.0026, respectively). A dose-dependent decrease of 67.7% and 53.9% in mean absolute lymphocyte count (ALC) from baseline was observed at week 8 for patients who received VTX002 60 mg and 30 mg, respectively. Most AEs were mild to moderate (Table 2). No AEs of bradycardia, atrioventricular block, serious infections, macular oedema, or deaths were reported. Conclusion The S1P1 receptor modulator VTX002 was well-tolerated and statistically superior to placebo for induction of clinical, endoscopic, histologic, HEMI, and symptomatic remission/response at week 13. These positive findings, including a dose-dependent pharmacodynamic reduction in ALC, support phase 3 development of VTX002 for treatment of UC.

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