Ulcerative ColitisPhase 2NCT04857112
Study Evaluating Efficacy and Safety of Amiselimod (MT-1303) in Mild to Moderate Ulcerative Colitis
A Phase 2 study testing Low Dose MT-1303, High Dose MT-1303 and MT-1303 in people with Ulcerative Colitis, run by Bausch Health Americas, Inc. at 185 sites in 19 countries.
Trial summary
The study will assess the efficacy and safety of oral MT-1303 compared to placebo at 12 weeks as the induction treatment in subjects with active mild to moderate ulcerative colitis (UC), as well as maintenance treatment with open-label MT-1303 for up to 36 weeks. 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?
- Low Dose MT-1303, High Dose MT-1303 and MT-1303
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 322 participants
- Where
- 185 sitesin 19 countries
- Study dates
- 29 Sep 2021to 8 Nov 2024
- Phase
- Phase 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
- Subjects will be eligible if they are male or female aged between 18 to 75 years at time of consent (inclusive) with normal vital signs and a diagnosis of active mild ulcerative colitis (UC) (modified Mayo Score of 3 or 4) or moderate UC (modified Mayo Score of 5 to 8) confirmed at least 12 weeks prior to randomization by clinical and endoscopic evidence and corroborated by a histopathology report.
- Subjects must have an endoscopic subscore of ≥2 from and evidence of active UC extending ≥15 cm from the anal verge confirmed by a screening colonoscopy.
- If subjects are receiving oral or rectal 5-aminosalicylates (5-ASAs) or oral corticosteroids (≤20 mg prednisolone equivalent) for treatment of their UC, they must be on a stable dose for at least 28 days prior to randomization.
- Subjects who complete the Double-Blind Period of the study who, in the opinion of the Investigator, would benefit from continued treatment, may participate in the Open Label Extension (OLE) Period.
Who cannot join
- Any of the following: a diagnosis of Crohn's disease, indeterminate colitis, colitis (pseudomembranous, microscopic, or ischemic) or coeliac disease, current or recent (within 12 weeks prior to randomization) evidence of fulminant colitis, proctitis (defined as a rectal inflammation within 15 cm from the anal verge), abdominal abscess, toxic megacolon, bowel obstruction, or bowel perforation; a history or evidence of any colonic resection or subtotal or total colectomy, ileostomy, colostomy, known fixed symptomatic stenosis of the intestine, unresected adenomatous colonic polyps, or colonic mucosal dysplasia.
- Clinically significant infections (e.g., pneumonia, pyelonephritis, or septicemia) within 4 weeks prior to randomization or previous clinically significant infections requiring hospitalization within 6 months prior to randomization, active or latent tuberculosis, infections of hepatitis B, hepatitis C, human immunodeficiency virus (HIV), or previous shingles outbreak.
- Active SARS-CoV-2 infection or complications related to COVID-19.
- A history of, or currently active, primary or secondary immunodeficiency, presence of progressive multifocal leukoencephalopathy (PML), or presence of demyelinating diseases.
- A history or evidence of two or more failures with biologic treatment for UC.
- Currently taking any medication for treatment of UC other than oral or rectal 5-ASAs (5-aminosalicylic acids) or oral corticosteroids (≤20 mg prednisolone equivalent)
Show all 22Show fewer
- Been taking enemas or suppositories (other than stable dose of 5-ASA) for treatment of UC within 2 weeks prior to the Screening Visit.
- Been taking an unstable dose of probiotics or antidiarrheals 2 weeks prior to the Screening Visit.
- Had recent myocardial infarction, unstable angina, stroke, transient ischemic attack, decompensated heart failure with hospitalization, Class III/IV heart failure, Mobitz Type II 2nd degree or 3rd degree atrioventricular (AV) block, sick sinus syndrome, prolonged QT interval, Wolff Parkinson White or other conduction abnormalities, low heart rate, ongoing treatment with Class I or Class III anti-arrhythmic drugs, heart-rate-lowering calcium-channel blockers, β blockers or with any other drugs which can reduce the heart rate, have known high risk for QT/QTc prolongation, or have clinically significant abnormal findings in 12-lead ECG that the Investigator considers may jeopardize the subject's health.
- Forced expiratory volume in one second (FEV1) or forced expiratory vital capacity (FVC) <70% of predicted values at screening. For sites where DLCO (diffusing capacity of the lungs for carbon monoxide) will be assessed, the value (mL/min/mmHg) is < 80% of the predicted normal value for age, height, and gender.
- Macular oedema as assessed by OCT (Optical Coherence Tomography).
- History of non-response or treatment failure with MT-1303 or other sphingosine 1 phosphate (S1P) receptor modulators.
- Fecal microbiota transplantation (FMT) within 12 months prior to the Screening Visit.
- Any of the following laboratory abnormalities:
- Hemoglobin (Hb) <9.0 g/dL.
- White blood cell (WBC) count <3.50 × 109/L (<3,500/µL).
- Neutrophil count <1.50 × 109/L (<1,500/µL).
- Lymphocyte count <0.80 × 109/L (<800/µL).
- Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) >2 × the upper limit of normal (ULN).
- Bilirubin >1.5 x the ULN; subjects with Gilbert's syndrome may be enrolled with total bilirubin up to 5.0 mg/dl.
- Positive stool tests for enteric pathogens, pathogenic ova or parasites, or Clostridium difficile (C. difficile) during the Screening Period. If subject has a history of recent C. difficile infection (within 60 days prior to Screening Visit), they should not be considered for study enrollment until subject has been treated for C. difficile and is symptom free for at least 14 days prior to the Screening Visit.
- Any physical or mental conditions which would interfere with the study participation, collection of data, or study completion as determined by the Investigator.
Trial locations and contacts
185 sites in 19 countries.
185 sites in 19 countries
United States22 sites
Bausch Site 025
Chandler, Arizona, 85225
Bausch Site 011
Chicago, Illinois, 60637
Bausch Site 014
El Paso, Texas, 79905
Salix Site 002
Freehold, New Jersey, 07728
Bausch Site 020
Glenview, Illinois, 60026
Bausch Site 018
Houston, Texas, 77030
Bausch Site 019
Houston, Texas, 77030
Bausch Site 008
Lafayette, Louisiana, 70503
Salix Site 004
Los Angeles, California, 90048
Bausch Site 013
Maitland, Florida, 32751
Bausch Site 017
Mentor, Ohio, 44060
Bausch Site 022
Metairie, Louisiana, 70006
Bausch Site 024
Miami, Florida, 33174
Salix Site 005
Miramar, Florida, 33027
Bausch Site 021
Oklahoma City, Oklahoma, 73101
Bausch site 026
Orlando, Florida, 32807
Salix Site 003
Rancho Cucamonga, California, 91730
Salix Site 007
Rialto, California, 92377
Salix Site 001
Shreveport, Louisiana, 71103
Salix Site 010
Snellville, Georgia, 30078
Bausch Site 012
Suffolk, Virginia, 23435
Salix Site 006
Ventura, California, 93003
Poland22 sites
Bausch Health Site 2320
Bialystok, 15-322
Bausch Health Site 2309
Bydgoszcz, 85-794
Bausch Health Site 2323
Elblag, 82-300
Bausch Health Site 2301
Krakow, 30-363
Bausch Health Site 2306
Krakow, 31-156
Bausch Health Site 2314
Lodz, 93-357
Bausch Health Site 2318
Nowy Targ, 34-400
Bausch Health Site 2305
Oświęcim, 32-600
Bausch Health Site 2316
Rzeszów, 35-302
Bausch Health Site 2304
Sopot, 81-756
Bausch Health Site 2321
Staszów, 28-200
Bausch Health Site 2302
Szczecin, 71-434
Bausch Health Site 2315
Tychy, 43-100
Bausch Health Site 2311
Warsaw, 00-635
Bausch Health Site 2303
Warsaw, 00-728
Bausch Health Site 2322
Warsaw, 02-665
Bausch Health Site 2308
Warsaw, 03-580
Bausch Health Site 2310
Wierzchosławice, 33-122
Bausch Health Site 2313
Wroclaw, 50-414
Bausch Health Site 2317
Wroclaw, 50-449
Bausch Health Site 2307
Wroclaw, 51-162
Bausch Health Site 2319
Wroclaw, 60-309
Japan21 sites
Bausch Health Site 2004
Chiba, 260-8677
Bausch Health Site 2014
Chiba, 285-8741
Bausch Health Site 2011
Fukuoka, 814-0180
Bausch Health Site 2005
Hiroshima, 734-8551
Bausch Health Site 2009
Hokkaido, 004-0041
Bausch Health Site 2019
Hokkaido, 060-8543
Bausch Health Site 2016
Hyōgo, 663-8501
Bausch Health Site 2013
Iwata, 020-8505
Bausch Health Site 2020
Kagawa, 252-0375
Bausch Health Site 2022
Kamakura, 247-0056
Bausch Health Site 2017
Mie, 510-0016
Bausch Health Site 2002
Miyagi, 983-8520
Bausch Health Site 2008
Nagasaki, 852-8102
Bausch Health Site 2006
Ōita, 870-0823
Bausch Health Site 2007
Saga, 849-8501
Bausch Health Site 2023
Takayama, 506-8550
Bausch Health Site 2012
Tokyo, 108-8642
Bausch Health Site 2018
Tokyo, 113-0034
Bausch Health Site 2010
Tokyo, 169-0073
Bausch Health Site 2021
Tokyo, 181-8611
Bausch Health Site 2003
Tokyo, 192-0032
Russia17 sites
Bausch Health Site 2403
Barnaul, 656015
Bausch Health Site 2416
Chelyabinsk, 454076
Bausch Health Site 2417
Chita, 672090
Bausch Health Site 2419
Moscow, 115419
Bausch Health Site 2406
Moscow, 115516
Bausch Health Site 2405
Nizhny Novgorod, 603140
Bausch Health Site 2411
Novosibirsk, 630005
Bausch Health Site 2421
Orenburg, 460050
Bausch Health Site 2413
Pyatigorsk, 357502
Bausch Health Site 2408
Saint Petersburg, 191015
Bausch Health Site 2409
Saint Petersburg, 191015
Bausch Health Site 2415
Saint Petersburg, 195257
Bausch Health Site 2402
Saint Petersburg, 197110
Bausch Health Site 2422
Samara, 443041
Bausch Health Site 2410
Tomsk, 634050
Bausch Health Site 2401
Velikiy Novgorod, 173008
Bausch Health Site 2423
Yekaterinburg, 620109
Germany15 sites
Bausch Health Site 1718
Augsburg, 86156
Bausch Health Site 1705
Berlin, 10117
Bausch Health Site 1716
Berlin, 14050
Bausch Health Site 1717
Brandenburg, 14770
Bausch Health Site 1708
Cologne, 51103
Bausch Health Site 1710
Dresden, 01307
Bausch Health Site 1707
Frankfurt am Main, 60594
Bausch Health Site 1706
Kiel, 24105
Bausch Health Site 1712
Mainz, 55122
Bausch Health Site 1713
Mannheim, 68167
Bausch Health Site 1702
Nordhausen, 99734
Bausch Health Site 1709
Remscheid, 42589
Bausch Health Site 1714
Rostock, 18057
Bausch Health Site 1701
Tübingen, 72076
Bausch Health Site 1703
Wipperfürth, 51688
Ukraine14 sites
Bausch Health Site 2815
Ivano-Frankivsk, 76008
Bausch Health Site 2803
Kharkiv, 61037
Bausch Health Site 2801
Khmelnytskyi, 29000
Bausch Health Site 2804
Kyiv, 01030
Bausch Health Site 2807
Kyiv, 02091
Bausch Health Site 2806
Kyiv, 04078
Bausch Health Site 2814
Kyiv
Bausch Health Site 2811
Lutsk, 43005
Bausch Health Site 2810
Lviv, 79010
Bausch Health Site 2805
Odesa, 65025
Bausch Health Site 2816
Vinnytsia, 21028
Bausch Health Site 2812
Zaporizhia, 69005
Bausch Health Site 2808
Zaporizhia, 69065
Bausch Health Site 2802
Zhytomyr, 10008
South Korea12 sites
Bausch Health Site 2109
Busan, 48108
Bausch Health Site 2112
Daegu, 41404
Bausch Health Site 2105
Daegu, 41944
Bausch Health Site 2114
Daegu, 42601
Bausch Health Site 2107
Seoul, 03080
Bausch Health Site 2101
Seoul, 05278
Bausch Health Site 2110
Seoul, 06351
Bausch Health Site 2102
Seoul, 06591
Bausch Health Site 2103
Seoul, 06973
Bausch Health Site 2108
Seoul
Bausch Health Site 2113
Suwon, 442-723
Bausch Health Site 2106
Wŏnju, 26426
Bulgaria7 sites
Bausch Site 1301
Sofia, 1233
Bausch Site 1304
Sofia, 1407
Bausch Site 1302
Sofia, 1527
Bausch Site 1307
Sofia, 1680
Bausch Site 1303
Sofia, 1784
Bausch Site 1305
Stara Zagora, 6000
Bausch Site 1306
Varna, 9002
Italy7 sites
Bausch Health Site 1906
Florence, 50134
Bausch Health Site 1904
Messina, 98125
Bausch Health Site 1909
Milan, 20142
Bausch Health Site 1901
Milan, 20157
Bausch Health Site 1908
Monza, 20900
Bausch Health Site 1907
Padova, 35128
Bausch Health Site 1903
Turin, 10128
Czechia6 sites
Bausch Health Site 1404
Brno, 615 00
Bausch Health Site 1405
Hradec Králové, 500 12
Bausch Health Site 1403
Olomouc, 779 00
Bausch Health Site 1406
Pardubice, 532 03
Bausch Health Site 1401
Prague, 130 00
Bausch Health Site 1402
Slaný, 274 01
Georgia6 sites
Bausch Health Site 1602
Tbilisi, 0131
Bausch Health Site 1603
Tbilisi, 0160
Bausch Health Site 1604
Tbilisi, 0160
Bausch Health Site 1605
Tbilisi, 0160
Bausch Health Site 1606
Tbilisi, 0160
Bausch Health Site 1601
Tbilisi, 0172
Slovakia6 sites
Bausch Health Site 2601
Banská Bystrica, 975 17
Bausch Health Site 2604
Bratislava, 820 07
Bausch Health Site 2605
Brezno, 97701
Bausch Health Site 2603
Košice, 040 13
Bausch Health Site 2602
Prešov, 080 01
Bausch Health Site 2606
Rimavská Sobota, 979 01
Australia5 sites
Bausch site 1005
Adelaide, 5112
Bausch site 1001
Brisbane, 4010
Bausch site 1006
Epping, 3076
Bausch site 1002
South Brisbane, 4101
Bausch site 1007
Woolloongabba, 4102
Moldova5 sites
Bausch Health Site 2202
Chisinau, 2005
Bausch Health Site 2205
Chisinau, MD-2068
Bausch Health Site 2201
Chisinau, MD2025
Bausch Health Site 2203
Chisinau, MD2025
Bausch Health Site 2204
Chisinau, MD2025
Serbia5 sites
Bausch Health Site 2501
Belgrade, 11 000
Bausch Health Site 2502
Belgrade, 11 000
Bausch Health Site 2503
Belgrade, 11 000
Bausch Health Site 2505
Kragujevac, 34 000
Bausch Health Site 2504
Pančevo, 260 00
Belarus4 sites
Bausch Site 1101
Homyel, 246029
Bausch Site 1104
Minsk, 220096
Bausch Site 1103
Mogilev, 212018
Bausch Site 1105
Vitebsk, 210002
Hungary4 sites
Bausch Health Site 1805
Békéscsaba, H-5600
Bausch Health Site 1803
Kistarcsa, H-2143
Bausch Health Site 1801
Mohács, 7700
Bausch Health Site 1802
Székesfehérvár, H-8000
Taiwan4 sites
Bausch Health Site 2703
Kaohsiung City, 807377
Bausch Health Site 2702
Taichung, 40201
Bausch Health Site 2701
Taichung, 404327
Bausch Health Site 2704
Tainan, 704302
Estonia3 sites
Bausch Site 1503
Pärnu, 80010
Bausch Site 1501
Tallinn, 10138
Bausch Site 1502
Tallinn, 10617
About this study
Official title: A Phase 2, Randomized, Double-Blinded, Placebo Controlled, Parallel Group Study Evaluating the Efficacy and Safety of Amiselimod (MT-1303) in Subjects With Mild to Moderate Ulcerative Colitis (UC)
The study will assess the efficacy and safety of oral MT-1303 compared to placebo at 12 weeks as the induction treatment in subjects with active mild to moderate ulcerative colitis (UC), as well as maintenance treatment with open-label MT-1303 for up to 36 weeks.
Read the detailed description
This is a Phase 2, randomized, double-blinded, placebo-controlled 3-arm, multi-center, parallel-group study with an open-label extension (OLE) period. The study includes a Screening Period (of up to 28 days) and a 12-week Double-Blind Period (Day 1 through Day 85) for all subjects. Subjects completing the Double-Blind Period through Day 85 will be provided the opportunity to continue in the OLE Period of the study to receive treatment through approximately one year. Subjects who do not participate in the OLE Period will be followed for 84 days in a Safety Follow-up Period.
- Conditions
- Ulcerative Colitis
- Being tested
- Low Dose MT-1303, High Dose MT-1303, Placebo, MT-1303
- Medical subject headings
- Colitis, Ulcerative
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Low Dose MT-1303Drug
Also called Amiselimod
MT-1303 loading dose of 0.4 mg once daily (QD) (Day 1-14) then maintenance dose of 0.2 mg QD (Day 15-85)
High Dose MT-1303Drug
Also called Amiselimod
MT-1303 loading dose of 0.8 mg QD (Day 1-14) then maintenance dose of 0.4 mg QD (Day 15-85)
PlaceboDrug
Also called Amiselimod
Matching placebo, QD (Day 1-85)
MT-1303Drug
Also called Amiselimod
0.4 mg MT-1303 QD for 36 weeks for those participants who continue on to the OLE period from the double-blind portion of the clinical study
| Study group | Role | What they receive |
|---|---|---|
| Low Dose | Experimental | MT-1303 loading dose of 0.4 mg once daily (QD) (Day 1-14) then maintenance dose of 0.2 mg QD (Day 15-85) Receives: Drug: Low Dose MT-1303 |
| High Dose | Experimental | MT-1303 loading dose of 0.8 mg QD (Day 1-14) then maintenance dose of 0.4 mg QD (Day 15-85) Receives: Drug: High Dose MT-1303 |
| Placebo | Placebo comparator | Matching placebo, QD (Day 1-85) Receives: Drug: Placebo |
| Open Label Extension Period | Other | 0.4 mg MT-1303 QD for 36 weeks for those participants who continue on to the OLE period from the double-blind portion of the clinical study Receives: Drug: MT-1303 |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change from Baseline in the modified Mayo Score at Day 85
The modified Mayo Score for ulcerative colitis disease activity provides an assessment of disease severity and can be used to monitor subjects during therapy. Scoring is accomplished by summation of subscores for endoscopic findings, stool frequency, and rectal bleeding, with higher scores indicating worse severity. Each subscore ranges from 0 to 3. The modified Mayo Score is defined as the sum of the endoscopy findings subscore + stool frequency subscore + rectal bleeding subscore, with a range from 0 to 9.
Measured: Baseline to Day 85
Secondary outcomes (3)
The proportion of subjects with endoscopic improvement at Day 85
The Mayo endoscopic subscore ranges from 0 to 3, with higher scores indicating worse severity. Endoscopic improvement is a Mayo endoscopic subscore of ≤1.
Measured: Baseline to Day 85
The change from Baseline in the 2-component Mayo Score at Day 85.
2-component Mayo scoring is accomplished by summation of subscores for endoscopic findings and rectal bleeding, with higher scores indicating worse severity. Each subscore ranges from 0 to 3. The 2-component Mayo Score is the sum of the rectal bleeding plus endoscopic subscores, with a range from 0 to 6.
Measured: Baseline to Day 85
The proportion of subjects with clinical remission at Day 85 based on the modified Mayo Score
The modified Mayo Score for ulcerative colitis disease activity provides an assessment of disease severity and can be used to monitor subjects during therapy. Scoring is accomplished by summation of subscores for endoscopic findings, stool frequency, and rectal bleeding, with higher scores indicating worse severity. Each subscore ranges from 0 to 3.
Remission is defined as follows:
- Endoscopy subscore of ≤1 (excludes friability); and
- Rectal bleeding subscore of 0; and
- At least one-point decrease in stool frequency subscore from Baseline to achieve a stool frequency subscore of ≤1.
Measured: Baseline to Day 85
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted23 Apr 2021
- Study start29 Sep 2021
- Primary completion3 Sep 2024
- Study completion8 Nov 2024
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.
- More trials run by Bausch Health Americas, Inc.The sponsor's other registered studies.
- 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 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Investigator
- Enrolment
- 322 participants (actual)
Sponsor and investigators
- Lead sponsor
- Bausch Health Americas, Inc.
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- John Lahey, Study director, Bausch Health Americas, Inc.
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04857112
- Sponsor's protocol ID
- AMUC-2023
- Status last verified
- Sep 2025
- First submitted
- 19 Apr 2021
- Last updated
- 9 Sep 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Undecided
Study at a glance
From the registry record, last updated by the sponsor on 9 Sep 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 2, Randomized, Double-Blinded, Placebo Controlled, Parallel Group Study Evaluating the Efficacy and Safety of Amiselimod (MT-1303) in Subjects With Mild to Moderate Ulcerative Colitis (UC)
- ClinicalTrials.gov ID
- NCT04857112
- Acronym / sponsor ID
- AMUC-2023
- Conditions
- Ulcerative Colitis
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 322 participants (actual)
- Lead sponsor
- Bausch Health Americas, Inc.Industry (pharma, biotech, devices)
- Study start
- 29 Sep 2021 (actual)
- Primary completion
- 3 Sep 2024 (actual)
- Study completion
- 8 Nov 2024 (actual)
- First posted
- 23 Apr 2021 (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 study will assess the efficacy and safety of oral MT-1303 compared to placebo at 12 weeks as the induction treatment in subjects with active mild to moderate ulcerative colitis (UC), as well as maintenance treatment with open-label MT-1303 for up to 36 weeks.
Detailed description
This is a Phase 2, randomized, double-blinded, placebo-controlled 3-arm, multi-center, parallel-group study with an open-label extension (OLE) period. The study includes a Screening Period (of up to 28 days) and a 12-week Double-Blind Period (Day 1 through Day 85) for all subjects. Subjects completing the Double-Blind Period through Day 85 will be provided the opportunity to continue in the OLE Period of the study to receive treatment through approximately one year. Subjects who do not participate in the OLE Period will be followed for 84 days in a Safety Follow-up Period.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, investigator)
- Number of arms
- 4
| Arm | Type | Receives |
|---|---|---|
| Low Dose | Experimental | Drug: Low Dose MT-1303MT-1303 loading dose of 0.4 mg once daily (QD) (Day 1-14) then maintenance dose of 0.2 mg QD (Day 15-85) |
| High Dose | Experimental | Drug: High Dose MT-1303MT-1303 loading dose of 0.8 mg QD (Day 1-14) then maintenance dose of 0.4 mg QD (Day 15-85) |
| Placebo | Placebo comparator | Drug: PlaceboMatching placebo, QD (Day 1-85) |
| Open Label Extension Period | Other | Drug: MT-13030.4 mg MT-1303 QD for 36 weeks for those participants who continue on to the OLE period from the double-blind portion of the clinical study |
Who may qualify
- Ages
- 18 to 75 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Subjects will be eligible if they are male or female aged between 18 to 75 years at time of consent (inclusive) with normal vital signs and a diagnosis of active mild ulcerative colitis (UC) (modified Mayo Score of 3 or 4) or moderate UC (modified Mayo Score of 5 to 8) confirmed at least 12 weeks prior to randomization by clinical and endoscopic evidence and corroborated by a histopathology report.
- Subjects must have an endoscopic subscore of ≥2 from and evidence of active UC extending ≥15 cm from the anal verge confirmed by a screening colonoscopy.
- If subjects are receiving oral or rectal 5-aminosalicylates (5-ASAs) or oral corticosteroids (≤20 mg prednisolone equivalent) for treatment of their UC, they must be on a stable dose for at least 28 days prior to randomization.
- Subjects who complete the Double-Blind Period of the study who, in the opinion of the Investigator, would benefit from continued treatment, may participate in the Open Label Extension (OLE) Period.
Key exclusion criteria (22 listed)
- Any of the following: a diagnosis of Crohn's disease, indeterminate colitis, colitis (pseudomembranous, microscopic, or ischemic) or coeliac disease, current or recent (within 12 weeks prior to randomization) evidence of fulminant colitis, proctitis (defined as a rectal inflammation within 15 cm from the anal verge), abdominal abscess, toxic megacolon, bowel obstruction, or bowel perforation; a history or evidence of any colonic resection or subtotal or total colectomy, ileostomy, colostomy, known fixed symptomatic stenosis of the intestine, unresected adenomatous colonic polyps, or colonic mucosal dysplasia.
- Clinically significant infections (e.g., pneumonia, pyelonephritis, or septicemia) within 4 weeks prior to randomization or previous clinically significant infections requiring hospitalization within 6 months prior to randomization, active or latent tuberculosis, infections of hepatitis B, hepatitis C, human immunodeficiency virus (HIV), or previous shingles outbreak.
- Active SARS-CoV-2 infection or complications related to COVID-19.
- A history of, or currently active, primary or secondary immunodeficiency, presence of progressive multifocal leukoencephalopathy (PML), or presence of demyelinating diseases.
- A history or evidence of two or more failures with biologic treatment for UC.
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 |
|---|---|---|
| Low Dose MT-1303Also: AmiselimodMT-1303 loading dose of 0.4 mg once daily (QD) (Day 1-14) then maintenance dose of 0.2 mg QD (Day 15-85) | Drug | Low Dose |
| High Dose MT-1303Also: AmiselimodMT-1303 loading dose of 0.8 mg QD (Day 1-14) then maintenance dose of 0.4 mg QD (Day 15-85) | Drug | High Dose |
| PlaceboAlso: AmiselimodMatching placebo, QD (Day 1-85) | Drug | Placebo |
| MT-1303Also: Amiselimod0.4 mg MT-1303 QD for 36 weeks for those participants who continue on to the OLE period from the double-blind portion of the clinical study | Drug | Open Label Extension Period |
Primary outcome
Change from Baseline in the modified Mayo Score at Day 85
Time frame: Baseline to Day 85
The modified Mayo Score for ulcerative colitis disease activity provides an assessment of disease severity and can be used to monitor subjects during therapy. Scoring is accomplished by summation of subscores for endoscopic findings, stool frequency, and rectal bleeding, with higher scores indicating worse severity. Each subscore ranges from 0 to 3. The modified Mayo Score is defined as the sum of the endoscopy findings subscore + stool frequency subscore + rectal bleeding subscore, with a range from 0 to 9.
3 secondary outcomes
The proportion of subjects with endoscopic improvement at Day 85
Time frame: Baseline to Day 85
The change from Baseline in the 2-component Mayo Score at Day 85.
Time frame: Baseline to Day 85
The proportion of subjects with clinical remission at Day 85 based on the modified Mayo Score
Time frame: Baseline to Day 85
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 9 Sep 2025.
- Individual participant dataSharing planned: Undecided
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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.
John Lahey study director
Bausch Health Americas, Inc.
185 sites in 19 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Low Dose MT-1303, High Dose MT-1303 and MT-1303 in people with Ulcerative Colitis, run by Bausch Health Americas, Inc. at 185 sites in 19 countries.
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 4 inclusion and 22 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 9 Sep 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 185 sites in United States, Poland, Japan, Russia, Germany and 14 more countries. 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. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
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?
Change from Baseline in the modified Mayo Score at Day 85 (time frame: Baseline to Day 85). 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 9 Sep 2025.