NCT06588855 · Hoffmann-La Roche
A Study to Assess the Efficacy and Safety of Induction Therapy With Afimkibart (Also Known as RO7790121) in Participants With Moderately to Severely Active Ulcerative Colitis
(Ametrine-2)
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 study will evaluate the effectiveness and safety of induction therapy with Afimkibart (RO7790121) compared with placebo in participants with moderately to severely active ulcerative colitis (UC).
View original scientific description
This Phase III, multicenter, double-blind, placebo-controlled study will evaluate the efficacy and safety of induction therapy with Afimkibart (RO7790121) compared with placebo in participants with moderately to severely active ulcerative colitis (UC).
Interventions
DRUG
Afimkibart
Participants will receive afimkibart IV followed by afimkibart subcutaneous SC injection.
DRUG
Placebo
Placebo matching IV afimkibart. Placebo matching SC afimkibart.
Primary outcome measures
Percentage of Participants with Clinical Remission
Time frame: At Week 12
Percentage of participants achieving Modified Mayo Score (mMS) \<=2 with stool frequency subscore (SFS) = 0 or 1 (up to 1-2 stools more than normal), rectal bleeding subscore (RBS) = 0 (no blood seen) and endoscopic subscore (ES) = 0 or 1 (normal appearance of mucosa or mild disease) at Week 12. mMS is a composite score of ulcerative colitis disease activity, given by the sum of three subscores: SFS, RBS and ES. Each subscore is measured on a scale from 0 to 3, with higher values associated with 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 UC
- Moderately to severely active UC assessed by mMS
- Bodyweight \>= 40 kilogram (kg)
- Up to date with colorectal cancer (CRC) screening performed according to local standards
- Demonstrated inadequate response, loss of response and/or intolerance to at least one protocol-specified conventional or advanced UC therapy
- Males and females of childbearing potential must meet protocol criteria for contraception requirements
Exclusion criteria
- Currently known complications of UC (e.g. fulminant colitis, toxic megacolon)
- Current diagnosis of Crohn's disease (CD) or indeterminate colitis, microscopic colitis, ischemic colitis, infectious colitis, radiation colitis
- Presence of an ostomy or ileoanal pouch
- Current diagnosis or suspicion of primary sclerosing cholangitis
- Pregnancy or breastfeeding, or intention of becoming pregnant during the study
- Past or current evidence of definite low-grade or high-grade colonic dysplasia or aden
Where
- Dothan, Alabama
- Scottsdale, Arizona
- Sun City, Arizona
- Apple Valley, California
- Garden Grove, California
- Lancaster, California
- Los Angeles, California
- Newport Beach, California
- Redwood City, California
- Colorado Springs, Colorado
- Coral Gables, Florida
- Hialeah, Florida
And 49 more locations — see the full list below.
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