Crohn's disease (CD) is a long-lasting condition causing inflammation that can affect any part of the gut. This study will evaluate how well risankizumab works compared to ustekinumab. This study will assess change in Crohn's Disease Activity Index (CDAI). Risankizumab is an investigational drug being developed for the treatment of Crohn's Disease (CD). Ustekinumab is an approved drug for the treatment of moderate and severe CD. Participants are randomly assigned to one of the three treatment groups. Each group receives a different treatment. There is a 1 in 2 chance that participants will be assigned to ustekinumab. Around 508 adult participants with moderate to severe CD will be enrolled in approximately 307 sites worldwide. In Part 1, participants assigned to risankizumab will receive intravenous (IV) doses of risankizumab at Week 0, 4,8 and subcutaneous (SC) doses every 8 weeks thereafter through Week 48. Participants assigned to ustekinumab will receive intravenous (IV) dose of ustekinumab at Week 0 and subcutaneous (SC) doses every 8 weeks thereafter through Week 48. In Part 2, participants who received risankizumab in Part 1 and completed the Week 48 visit will continue to receive SC risankizumab for up to an additional 220 weeks. There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the study at a hospital or clinic. The effect of the treatment will be checked by medical assessments, blood tests, checking for side effects and completing questionnaires.



Eligible Ages
Between 18 Years and 80 Years
Eligible Genders
Accepts Healthy Volunteers

Inclusion Criteria

  • Confirmed diagnosis of Crohn's disease (CD) for at least 3 months prior to Baseline. - Crohn's disease activity index (CDAI) score 220 - 450 at Baseline. - Confirmed diagnosis of moderate to severe Crohn's Disease as assessed by stool frequency (SF), abdominal pain (AP) score, and Simple Endoscopic score for CD (SES-CD). - Demonstrated intolerance or inadequate response to one or more anti-tumor necrosis factor (TNF) therapies.

Exclusion Criteria

  • Current diagnosis of ulcerative colitis or indeterminate colitis. - Receipt of CD approved biologic agents prior to Baseline (as detailed in protocol), or any investigational biologic or other agent or procedure prior to Baseline (as detailed in protocol). - Prior exposure to p19 and/or p40 inhibitors (e.g., risankizumab and ustekinumab). - Currently know complications of CD (strictures, short bowel, etc).

Study Design

Phase 3
Study Type
Intervention Model
Parallel Assignment
Primary Purpose
Single (Outcomes Assessor)

Arm Groups

ArmDescriptionAssigned Intervention
Risankizumab Dose A Followed by Dose B
Participants will receive intravenous risankizumab dose A at Week 0, 4 ,8 followed by subcutaneous (SC) risankizumab dose B every 8 weeks through Week 48. Participants who complete the Week 48 visit will continue SC risankizumab for up to an additional 220 weeks.
  • Drug: Risankizumab
    Intravenous (IV) Infusion
    Other names:
    • ABBV-066
  • Drug: Risankizumab
    Subcutaneous (SC) Injection
    Other names:
    • ABBV-066
Active Comparator
Participants will receive weight-based intravenous ustekinumab at Week 0 followed by subcutaneous ustekinumab every 8 weeks through Week 48.
  • Drug: Ustekinumab
    Intravenous (IV) infusion
  • Drug: Ustekinumab
    Subcutaneous (SC) injection

Recruiting Locations

Massachusetts General Hospital /Id# 224335
Boston, Massachusetts 02114

More Details


Study Contact



Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.