Conditions: Ulcerative Colitis
Keywords: Ulcerative Colitis, IBD
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 359
Healthy volunteers: no

Brief summary:
The primary objective of this study is to evaluate the effect of abrilumab on induction of remission in adults with moderate to severe ulcerative colitis after 8 weeks of treatment as assessed by a total Mayo Score ≤ 2 points, with no individual subscore \> 1 point.

Detailed description:
The study consisted of a 24-week double-blind, placebo-controlled treatment period followed by an open-label period of approximately 108 weeks. Participants were eligible to enter the open-label period of the study early if they did not achieve a response at week 8 and had an inadequate response at week 12 or later or if they experienced disease worsening after achieving response and/or remission at week 8. Failure to achieve response at week 8 was defined as failure to achieve a decrease from baseline in total Mayo Score ≥ 3 points and ≥ 30% decrease from baseline. Inadequate response at week 12 or later was defined as failure to achieve a 2-point decrease and 25% improvement in partial Mayo Score compared with screening and minimum partial Mayo Score ≥ 5 points. Disease worsening was defined as an increase in partial Mayo Score ≥ 3 points from the week 8 value and minimum partial Mayo Score ≥ 5 points with recto-sigmoidoscopy sub-score ≥ 2.

Participants were planned to be randomized in a 2:1:2:2:2 ratio to placebo or abrilumab at 7 mg, 21 mg, 70 mg (on day 1, week 2, week 4, and every 4 weeks thereafter until week 24), or 210 mg (on day 1 followed by placebo in weeks 2 and 4 and every 4 weeks thereafter until week 24), respectively. Due to a consistent discrepancy between the investigational product (IP) instruction manual (IPIM) description of vial positions and the actual vial positions in the IP package participants were initially randomized to 3 arms (placebo, 70 mg, and 210 mg) with a randomization ratio of 4:3:2. The study was temporarily paused while this issue was investigated. Once the discrepancy was corrected, Protocol Amendment 3 implemented, and affected participants completed their double-blind treatment period, the study resumed enrollment and randomization per protocol. Neither the randomization nor study blind was compromised and therefore the intent-to-treat principle was maintained.

Arms:
arm 1: Participants received placebo by subcutaneous injection on day 1, week 2, week 4, and every 4 weeks thereafter until week 24.

During the open-label period, participants received abrilumab 210 mg once every 3 months (Q3M) for 108 weeks. arm 2: Participants received 7 mg abrilumab by subcutaneous injection on day 1, week 2, week 4, and every 4 weeks (Q4W) thereafter until week 24.

During the open-label period, participants received abrilumab 210 mg once every 3 months (Q3M) for 108 weeks. arm 3: Participants received 21 mg abrilumab by subcutaneous injection on day 1, week 2, week 4, and every 4 weeks thereafter until week 24.

During the open-label period, participants received abrilumab 210 mg once every 3 months (Q3M) for 108 weeks. arm 4: Participants received 70 mg abrilumab by subcutaneous injection on day 1, week 2, week 4, and every 4 weeks thereafter until week 24.

During the open-label period, participants received abrilumab 210 mg once every 3 months (Q3M) for 108 weeks. arm 5: Participants received a single dose of 210 mg abrilumab by subcutaneous injection on day 1, followed by placebo at week 2, week 4, and every 4 weeks thereafter until week 24.

During the open-label period, participants received abrilumab 210 mg once every 3 months (Q3M) for 108 weeks.

Interventions: intervention 1: Abrilumab intervention 2: Placebo
Intervention descriptions: intervention 1: Administered by subcutaneous injection. intervention 2: Placebo matching to abrilumab administered by subcutaneous injection

Protocol document: