Ulcerative ColitisPhase 1/2NCT07083193
A Study of AC-101 Tablets in Participants With Moderate to Severe Active Ulcerative Colitis
A Phase 1/2 study testing AC-101 in people with Ulcerative Colitis, run by Accro Bioscience (Suzhou) Limited at 1 site in China.
Trial summary
The purpose of the study is to evaluate the safety, efficacy, and pharmacokinetics of AC-101 tablets in participants with moderate-to-severe ulcerative colitis. The total study duration is up to 17 weeks, including 4-week screening, 12-week treatment period, and 1-week safety follow-up. Read more about this study
- Who is it for?
- Ages 18 to 75 years
- Conditions the study is for
- Ulcerative Colitis
- What is being tested?
- AC-101
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 25 participants
- Where
- 1 siteChina
- Study dates
- 20 Jan 2025to 20 Apr 2026
- Phase
- Phase 1/2
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 75 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Diagnosis of Ulcerative Colitis (UC) or suspected UC symptom for at least 3 months prior to enrolment and confirmed diagnosis of UC by endoscopic and histopathological examinations during screening.
- Evidence of active UC defined by modified Mayo score of 5 to 9 points (inclusive) with 3 subscores meeting the followings:
- Stool frequency (SF) subscore of .≥ 2 points, and
- Rectal bleeding (RB) subscore of .≥ 1 points, and
- Endoscopic (ES) subscore of ≥ 2 points (excluding friability), confirmed by screening endoscopy
- Disease extension of ≥ 15cm from anal verge, confirmed by screening endoscopy
- Currently using concomitant 5-salicylates (5-ASA) or oral corticosteroid (≤ 20 mg prednisone or equivalent, ≤ 9 mg budesonide MMX or equivalent) should keep stable doses from 2 weeks prior to enrolment till study completion.
- Biologic-naïve or previous biological treatment for more than 5 half-lives.
Who cannot join
- Previous/current documented diagnosis of Crohn's Disease (CD), indeterminate colitis, severe UC required hospitalization or corticosteroid pulse therapy, ulcerative proctitis, fulminant colitis, ischemic colitis and other intestinal diseases.
- Previous received 2 or more types of advanced treatment including biologics (e.g., TNF-α antibodies, IL-12/23 antibodies, integrin-α4β7 antibodies) and small molecule (e.g., JAK inhibitors, S1P receptor modulator), and all deemed by investigator as treatment failure.
- Intravenous/rectal administration of steroids or topical administration of 5-ASA within 2 weeks prior to enrolment; systemic administration of small molecule (e.g., Tofacitinib, Upadacitinib, Ozanimod) within 4 weeks prior to enrolment.
- Clostridium difficile infection or other enteric pathogen infection within 30 days prior to endoscopy, or positive for Clostridium difficile or other enteric pathogens prior to enrolment.
Trial locations and contacts
1 site in 1 country.
China1 site
The First Affiliated Hospital,Sun Yat-sen University
Guangzhou, Guangdong, 510080
About this study
Official title: A Phase 1b, Multicenter, Open-label, Randomized Study to Evaluate the Safety, Efficacy, and Pharmacokinetics of AC-101 Tablets in Participants With Moderate to Severe Active Ulcerative Colitis
The purpose of the study is to evaluate the safety, efficacy, and pharmacokinetics of AC-101 tablets in participants with moderate-to-severe ulcerative colitis.
The total study duration is up to 17 weeks, including 4-week screening, 12-week treatment period, and 1-week safety follow-up.
The study will enroll approximately 24 participants with moderate to severe active ulcerative colitis.
- Conditions
- Ulcerative Colitis
- Being tested
- AC-101
- Medical subject headings
- Colitis, Ulcerative
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
AC-101Drug
AC-101 tablets will be administered orally.
| Study group | Role | What they receive |
|---|---|---|
| AC-101 Dose 1 | Experimental | Participants will receive AC-101 Dose 1 as tablets orally twice daily from Week 0 through W12 Receives: Drug: AC-101 |
| AC-101 Dose 2 | Experimental | Participants will receive AC-101 Dose 2 as tablets orally once daily from Week 0 through W12 Receives: Drug: AC-101 |
What is being measured
The primary outcome is the main question the study is designed to answer.
Incidence and Severity of Adverse Events
An Adverse Event (AE) is defined as any new untoward medical condition or worsening of a pre-existing medical condition following or during exposure to an investigation product, whether or not considered causally related to the product.
Measured: Up to Week 13
Secondary outcomes (2)
Proportion of Participants Achieved Clinical Response
Clinical response is defined as achieving the following changes in the modified Mayo score (excludes the physicians' global assessment)
- A decrease from baseline in modified Mayo score of ≥ 2 points, and
- A decrease from baseline in modified Mayo score of ≥ 30%, and
- A decrease from baseline in rectal bleeding (RB) subscore of ≥ 1 point or absolute RB subscore ≤ 1 point
The modified Mayo score is a sum of the following 3 subscores:
- Stool frequency (SF) subscore (0-3)
- Rectal bleeding (RB) subscore (0-3)
- Endoscopic (ES) subscore (0-3)
Measured: Week 12
Proportion of Participants achieved Clinical Remission
Clinical remission is defined as achieving the following changes in the modified Mayo score
- Absolute modified Mayo score ≤ 2 points, and
- Absolute SF subscore ≤ 1 point, and
- Absolute RB subscore = 0 point, and
- Absolute ES subscore ≤ 1 point
Measured: Week 12
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted24 Jul 2025
- Study start20 Jan 2025
- Primary completion20 Apr 2026
- Study completion20 Apr 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Ulcerative ColitisStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1/2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 25 participants (actual)
Sponsor and investigators
- Lead sponsor
- Accro Bioscience (Suzhou) Limited
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07083193
- Sponsor's protocol ID
- AC101-004
- Status last verified
- Oct 2026
- First submitted
- 16 Jul 2025
- Last updated
- 28 Oct 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 28 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 1b, Multicenter, Open-label, Randomized Study to Evaluate the Safety, Efficacy, and Pharmacokinetics of AC-101 Tablets in Participants With Moderate to Severe Active Ulcerative Colitis
- ClinicalTrials.gov ID
- NCT07083193
- Acronym / sponsor ID
- AC101-004
- Conditions
- Ulcerative Colitis
- Phase
- Phase 1/2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 25 participants (actual)
- Lead sponsor
- Accro Bioscience (Suzhou) LimitedIndustry (pharma, biotech, devices)
- Study start
- 20 Jan 2025 (actual)
- Primary completion
- 20 Apr 2026 (actual)
- Study completion
- 20 Apr 2026 (actual)
- First posted
- 24 Jul 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of the study is to evaluate the safety, efficacy, and pharmacokinetics of AC-101 tablets in participants with moderate-to-severe ulcerative colitis.
The total study duration is up to 17 weeks, including 4-week screening, 12-week treatment period, and 1-week safety follow-up.
The study will enroll approximately 24 participants with moderate to severe active ulcerative colitis.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| AC-101 Dose 1 | Experimental | Drug: AC-101Participants will receive AC-101 Dose 1 as tablets orally twice daily from Week 0 through W12 |
| AC-101 Dose 2 | Experimental | Drug: AC-101Participants will receive AC-101 Dose 2 as tablets orally once daily from Week 0 through W12 |
Who may qualify
- Ages
- 18 to 75 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (8 listed)
- Diagnosis of Ulcerative Colitis (UC) or suspected UC symptom for at least 3 months prior to enrolment and confirmed diagnosis of UC by endoscopic and histopathological examinations during screening.
- Evidence of active UC defined by modified Mayo score of 5 to 9 points (inclusive) with 3 subscores meeting the followings:
- Disease extension of ≥ 15cm from anal verge, confirmed by screening endoscopy
- Currently using concomitant 5-salicylates (5-ASA) or oral corticosteroid (≤ 20 mg prednisone or equivalent, ≤ 9 mg budesonide MMX or equivalent) should keep stable doses from 2 weeks prior to enrolment till study completion.
- Biologic-naïve or previous biological treatment for more than 5 half-lives.
Key exclusion criteria (4 listed)
- Previous/current documented diagnosis of Crohn's Disease (CD), indeterminate colitis, severe UC required hospitalization or corticosteroid pulse therapy, ulcerative proctitis, fulminant colitis, ischemic colitis and other intestinal diseases.
- Previous received 2 or more types of advanced treatment including biologics (e.g., TNF-α antibodies, IL-12/23 antibodies, integrin-α4β7 antibodies) and small molecule (e.g., JAK inhibitors, S1P receptor modulator), and all deemed by investigator as treatment failure.
- Intravenous/rectal administration of steroids or topical administration of 5-ASA within 2 weeks prior to enrolment; systemic administration of small molecule (e.g., Tofacitinib, Upadacitinib, Ozanimod) within 4 weeks prior to enrolment.
- Clostridium difficile infection or other enteric pathogen infection within 30 days prior to endoscopy, or positive for Clostridium difficile or other enteric pathogens prior to enrolment.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| AC-101AC-101 tablets will be administered orally. | Drug | AC-101 Dose 1, AC-101 Dose 2 |
Primary outcome
Incidence and Severity of Adverse Events
Time frame: Up to Week 13
An Adverse Event (AE) is defined as any new untoward medical condition or worsening of a pre-existing medical condition following or during exposure to an investigation product, whether or not considered causally related to the product.
2 secondary outcomes
Proportion of Participants Achieved Clinical Response
Time frame: Week 12
Proportion of Participants achieved Clinical Remission
Time frame: Week 12
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 28 Oct 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 1/2 study testing AC-101 in people with Ulcerative Colitis, run by Accro Bioscience (Suzhou) Limited at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 8 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 28 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this combined phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Incidence and Severity of Adverse Events (time frame: Up to Week 13). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Oct 2026.