NCT06819878 · Hoffmann-La Roche
A Study to Assess the Efficacy and Safety of Induction and Maintenance Therapy With Afimkibart (RO7790121) in Participants With Moderately to Severely Active Crohn's Disease
(SIBERITE-1)
What this study is about
This Phase III, conducted at multiple hospitals, where neither patients nor doctors know which treatment is given, compared against an inactive treatment treat-through study will evaluate the effectiveness and safety of induction and maintenance therapy with Afimkibart (also known as RO7790121) in participants with moderately to severely active Crohn's disease (CD).
View original scientific description
This Phase III, multicenter, double-blind, placebo-controlled treat-through study will evaluate the efficacy and safety of induction and maintenance therapy with Afimkibart (also known as RO7790121) in participants with moderately to severely active Crohn's disease (CD).
Interventions
DRUG
Afimkibart
Afimkibart will be administered as IV infusion. Afimkibart will be administered as SC injection.
DRUG
Placebo
Placebo matching IV afimkibart. Placebo matching SC afimkibart.
Primary outcome measures
Percentage of Participants with Clinical Remission per Crohn's Disease Activity Index (CDAI) Score
Time frame: At Week 52
Percentage of participants achieving a CDAI score of \<150. The index is a weighted sum of scores on eight components: number of liquid or soft stools (stool frequency), abdominal pain, general well-being, number of complications, use of anti-diarrheal medication, presence of an abdominal mass, hematocrit, and percentage deviation from standard body weight. CDAI generally ranges from 0 to roughly 600, with higher values indicating greater activity.
Percentage of Participants with Endoscopic Response
Time frame: At Week 52
Percentage of participants achieving a decrease in Simple Endoscopic Score for Crohn's Disease (SES-CD) of \>=50% from baseline. The SES-CD is a composite of four features of endoscopic activity (presence and size of ulcers, extent of ulcerated surface, extent of affected and presence and type of narrowings or stenosis) in up to five ileocolonic segments (terminal ileum, right colon, transverse colon, sigmoid and left colon, and rectum). Each feature is scored on a scale from 0 to 3, giving segment subscores of 0 to 12 points and a total SES-CD range of 0-60, with a higher value indicating greater severity.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Confirmed diagnosis of CD
- Moderately to severely active CD
- Bodyweight \>= 40 kilogram (kg)
- Demonstrated inadequate response, loss of response and/or intolerance to at least one protocol-specified conventional or advanced CD therapy
- Males and females of childbearing potential must meet protocol criteria for contraception requirements
Exclusion criteria
- Current diagnosis of ulcerative colitis (UC) or indeterminate colitis, ischemic colitis, infectious colitis, radiation colitis, microscopic colitis
- Participant with a history of \>= 3 bowel resections (\> 2 missing segments of the 5 following segments: terminal ilelium, right colon, transverse colon, sigmoid and left colon, and rectum)
- Diagnosis of short gut or short bowel syndrome
- Presence of an ileostomy, colostomy or ileoanal pouch
- Participants with symptomatic bowel strictures, fulminant colitis, or toxic megacolon
- Presence of abdominal or perianal abscess
- Presence of rectovaginal, enter
Where
- Dothan, Alabama
- Phoenix, Arizona
- Sun City, Arizona
- Tucson, Arizona
- Garden Grove, California
- Inglewood, California
- La Jolla, California
- Lancaster, California
- Los Alamitos, California
- San Diego, California
- San Francisco, California
- Littleton, Colorado
And 69 more locations — see the full list below.
Collaborators
Chugai Pharmaceutical
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jul 2, 2026 · Source of record for eligibility and locations