Early and Sustained Symptom Control with Mirikizumab in Patients with Ulcerative Colitis in the Phase 3 LUCENT Programme

Background and aims: Ulcerative colitis [UC], a chronic inflammatory bowel disease, may manifest with symptoms of increased stool frequency [SF], rectal bleeding [RB], bowel urgency [BU], abdominal pain [AP], and fatigue. Mirikizumab, an anti-IL-23p19 antibody, demonstrated efficacy and safety in patients with moderately to severely active UC in the LUCENT Phase 3 trials. We evaluated mirikizumab's efficacy in achieving symptom control and time to symptom improvement during induction, maintenance of sustained symptom control, 'comprehensive symptom control', defined according to a combination of individual patient-reported outcomes, and prognostic baseline indicators of early symptomatic remission at Week 4.

Methods: The results of LUCENT-1/-2 have previously been reported. Treatment differences for symptomatic endpoints were compared over 52 weeks versus placebo [PBO] and comprehensive symptomatic endpoints at 12 and 52 weeks of continuous treatment. Subgroup analyses were conducted for prior biologic or tofacitinib treatment failure. Prognostic analyses were run using regression analysis.

Results: By Week [W] 2, mirikizumab-treated patients achieved greater reductions in SF, RB, BU, and fatigue versus PBO. At W4, there was a higher rate of AP improvement. At W12, a greater proportion of mirikizumab-treated patients achieved symptomatic remission, RB remission, SF remission, and BU remission/clinically meaningful improvement. Mirikizumab-treated patients sustained symptom control versus placebo patients in maintenance until W52. This treatment effect was shown in patients regardless of prior biologic or tofacitinib failure. Additionally, mirikizumab achieved comprehensive symptom control versus PBO at W12 and W52.

Conclusions: Mirikizumab demonstrated efficacy in achieving and sustaining symptom control and comprehensive symptom control over 52 weeks [NCT03518086; NCT03524092].