A Phase 2 interventional study of HTD1801 and Placebo in Primary Sclerosing Cholangitis (PSC), sponsored by HighTide Therapeutics (Hong Kong) Limited. Completed at 26 sites in 2 countries. Open to participants aged 18 Years to 75 Years. Per ClinicalTrials.gov, last updated 2026-08-25.
Sponsored by HighTide Therapeutics (Hong Kong) Limited · Phase 2, Interventional, and Treatment
The study was a dose-ranging, 18-week study comparing two doses of HTD1801 (500 mg BID and 1000 mg BID) to placebo in adult subjects with PSC.
149 studies on the registry are indexed under Cholangitis, Sclerosing; 39 are open to participants now.
This study's enrollment of 59 is above the median of 34 across 94 interventional studies indexed under Cholangitis, Sclerosing.
Browse Cholangitis, Sclerosing studies →HighTide Therapeutics (Hong Kong) Limited is the lead sponsor of 8 studies on the registry; none are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
If subjects have Inflammatory Bowel Disease (IBD) they will be eligible to participate. If a subject has IBD, documented evidence of IBD must have been evident by prior endoscopy or in previous medical records for ≥6 months. In addition, subjects may only enter the study with a Partial Mayo Score of 0-4, inclusively. Subjects who are on treatment are allowed, provided they are stable for 3 months if taking:
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Blood tests of how long blood takes to clot. The INR is the prothrombin time (PT) put on a common scale; about 1 is usual for someone not taking a blood thinner.
Criteria often make an exception for people on a blood thinner such as warfarin, whose INR is raised on purpose.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
INR, PT and aPTT (clotting tests)
Blood tests of how long blood takes to clot. The INR is the prothrombin time (PT) put on a common scale; about 1 is usual for someone not taking a blood thinner.
Criteria often make an exception for people on a blood thinner such as warfarin, whose INR is raised on purpose.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Drug: HTD1801
Drug: HTD1801
Drug: Placebo
HTD1801 tablets, 250 mg
tablets manufactured to mimic HTD1801 tablets
Absolute Change in Serum Alkaline Phosphatase (ALP) From Baseline to Week 6 in Period 1
Time frame: Baseline to Week 6
Percentage of Subjects Who Achieve ALP of <1.5 x ULN at the End of Week 6 (Period 1)
Time frame: Baseline to Week 6
Percentage of Subjects Who Achieve a 50% Decrease in ALP at the End of Week 6 (Period 1)
Time frame: Baseline to Week 6
Percentage of Subjects Who Normalize ALP at the End of Week 6 (Period 1)
Time frame: Baseline to Week 6
Absolute Change in Serum Total Bilirubin at the End of Week 6 (Period 1)
Time frame: Baseline to Week 6
Absolute Change in Serum ALP From Week 6 to Week 12 (Period 2)
Time frame: Week 6 to Week 12
Percentage of Subjects Who Achieve ALP of <1.5 x ULN at the End of Week 12 (Period 2)
Time frame: Week 6 to Week 12
Percentage of Patients Who Achieve a 50% Decrease in ALP at the End of Week 12 (Period 2)
Time frame: Week 6 to Week 12
Percentage of Patients Who Normalize ALP at the End of Week 12 (Period 2)
Time frame: Week 6 to Week 12
Absolute Change in Serum Total Bilirubin at the End of Week 12 (Period 2)
Time frame: Week 6 to Week 12
Absolute Change in Serum ALP From Week 12 to Week 18 (Period 3)
Change in serum ALP between a new baseline at Week 12 and the final value at Week 18 for all subjects following the randomized withdrawal
Time frame: Week 12 to Week 18
Percentage of Patients Who Achieve ALP of <1.5 x ULN at the End of Week 18 (Period 3)
The percentage of patients who achieve ALP of \<1.5 x ULN at the end of week 18 (Period 3)
Time frame: Week 12 to Week 18
Percentage of Patients Who Achieve a 50% Decrease in ALP at the End of Week 18 (Period 3)
Time frame: Week 12 to Week 18
Percentage of Subjects Who Normalize ALP at the End of Week 18 (Period 3)
Time frame: Week 12 to Week 18
Absolute Change in Serum Total Bilirubin at the End of Week 18 (Period 3)
Time frame: Week 12 to Week 18
Fifty-nine subjects were recruited from 23 academic medical centers and community clinics in the US and Canada. The first subject was enrolled on 18 June 2018 and the last subject last visit was completed on 10 Aug 2020.
| Milestone | 500mg HTD1801 BID | 1000 mg HTD1801 BID | Placebo BID |
|---|---|---|---|
| Started | 16 | 25 | 18 |
| Completed | 15 | 21 | 14 |
| Not completed | 1 | 4 | 4 |
| Withdrew: Protocol violation | 0 | 0 | 1 |
| Withdrew: Withdrawal by subject | 0 | 1 | 1 |
| Withdrew: Corporate decision to not initiate dosing in new patients because of covid-19 | 1 | 0 | 1 |
| Withdrew: Adverse event | 0 | 3 | 1 |
| Milestone | 500mg HTD1801 BID | 1000 mg HTD1801 BID | Placebo BID |
|---|---|---|---|
| Started | 22 | 29 | 0 |
| Completed | 19 | 28 | 0 |
| Not completed | 3 | 1 | 0 |
| Withdrew: Adverse event | 2 | 1 | 0 |
| Withdrew: Lost to follow-up | 1 | 0 | 0 |
| Milestone | 500mg HTD1801 BID | 1000 mg HTD1801 BID | Placebo BID |
|---|---|---|---|
| Started | 10 | 14 | 26 |
| Completed | 8 | 14 | 25 |
| Not completed | 2 | 0 | 1 |
| Withdrew: Adverse event | 1 | 0 | 0 |
| Withdrew: Lost to follow-up | 1 | 0 | 1 |
| U/L | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID |
|---|---|---|---|
| Absolute Change in Serum Alkaline Phosphatase (ALP) From Baseline to Week 6 in Period 1 | -71 ± 136.9 | -73 ± 139.9 | 94 ± 261.7 |
| Participants | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID |
|---|---|---|---|
| Percentage of Subjects Who Achieve ALP of <1.5 x ULN at the End of Week 6 (Period 1) | 2 | 6 | 1 |
| Participants | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID |
|---|---|---|---|
| Percentage of Subjects Who Achieve a 50% Decrease in ALP at the End of Week 6 (Period 1) | 1 | 4 | 0 |
| Participants | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID |
|---|---|---|---|
| Percentage of Subjects Who Normalize ALP at the End of Week 6 (Period 1) | 0 | 2 | 0 |
| mg/dL | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID |
|---|---|---|---|
| Absolute Change in Serum Total Bilirubin at the End of Week 6 (Period 1) | -0.2 ± 0.52 | 0.0 ± 0.50 | 0.1 ± 0.26 |
| U/L | Placebo to HTD1801 500 mg BID | HTD1801 500 mg BID to HTD1801 500 mg BID | Placebo to HTD1801 1000 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID |
|---|---|---|---|---|
| Absolute Change in Serum ALP From Week 6 to Week 12 (Period 2) | -34 ± 180.3 | -14 ± 74.6 | -189 ± 270.7 | 10 ± 65.9 |
| Participants | Placebo to HTD1801 500 mg BID | HTD1801 500 mg BID to HTD1801 500 mg BID | Placebo to HTD1801 1000 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID |
|---|---|---|---|---|
| Percentage of Subjects Who Achieve ALP of <1.5 x ULN at the End of Week 12 (Period 2) | 0 | 2 | 0 | 6 |
| Participants | Placebo to HTD1801 500 mg BID | HTD1801 500 mg BID to HTD1801 500 mg BID | Placebo to HTD1801 1000 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID |
|---|---|---|---|---|
| Percentage of Patients Who Achieve a 50% Decrease in ALP at the End of Week 12 (Period 2) | 1 | 0 | 0 | 2 |
| Participants | Placebo to HTD1801 500 mg BID | HTD1801 500 mg BID to HTD1801 500 mg BID | Placebo to HTD1801 1000 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID |
|---|---|---|---|---|
| Percentage of Patients Who Normalize ALP at the End of Week 12 (Period 2) | 0 | 0 | 0 | 2 |
| mg/dL | Placebo to HTD1801 500 mg BID | HTD1801 500 mg BID to HTD1801 500 mg BID | Placebo to HTD1801 1000 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID |
|---|---|---|---|---|
| Absolute Change in Serum Total Bilirubin at the End of Week 12 (Period 2) | -0.1 ± 0.28 | 0.0 ± 0.25 | -0.4 ± 0.16 | 0.0 ± 0.49 |
Change in serum ALP between a new baseline at Week 12 and the final value at Week 18 for all subjects following the randomized withdrawal
| U/L | HTD1801 500 mg BID to HTD1801 500 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID | HTD1801 500 mg BID to Placebo | HTD1801 1000 mg BID to Placebo |
|---|---|---|---|---|
| Absolute Change in Serum ALP From Week 12 to Week 18 (Period 3) | -63 ± 88.9 | 21 ± 141.7 | 183 ± 292.0 | 142 ± 163.7 |
The percentage of patients who achieve ALP of \<1.5 x ULN at the end of week 18 (Period 3)
| Participants | HTD1801 500 mg BID to HTD1801 500 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID | HTD1801 500 mg BID to Placebo | HTD1801 1000 mg BID to Placebo |
|---|---|---|---|---|
| Percentage of Patients Who Achieve ALP of <1.5 x ULN at the End of Week 18 (Period 3) | 1 | 4 | 0 | 1 |
| Participants | HTD1801 500 mg BID to HTD1801 500 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID | HTD1801 500 mg BID to Placebo | HTD1801 1000 mg BID to Placebo |
|---|---|---|---|---|
| Percentage of Patients Who Achieve a 50% Decrease in ALP at the End of Week 18 (Period 3) | 1 | 0 | 0 | 1 |
| Participants | HTD1801 500 mg BID to HTD1801 500 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID | HTD1801 500 mg BID to Placebo | HTD1801 1000 mg BID to Placebo |
|---|---|---|---|---|
| Percentage of Subjects Who Normalize ALP at the End of Week 18 (Period 3) | 0 | 1 | 0 | 0 |
| mg/dL | HTD1801 500 mg BID to HTD1801 500 mg BID | HTD1801 1000 mg BID to HTD1801 1000 mg BID | HTD1801 500 mg BID to Placebo | HTD1801 1000 mg BID to Placebo |
|---|---|---|---|---|
| Absolute Change in Serum Total Bilirubin at the End of Week 18 (Period 3) | -0.2 ± 0.19 | 0.0 ± 0.23 | 0.1 ± 0.36 | 0.1 ± 0.22 |
Collected over Adverse events were collected from the time the subject signed the informed consent form at the screening date through Study Visit Week 22.. Non-serious events are listed at a 0% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| 500mg HTD1801 Bid | 0/22 (0%) | 1/22 (4.5%) | 14/22 (63.6%) |
| 1000mg HTD1801 Bid | 0/31 (0%) | 3/31 (9.7%) | 20/31 (64.5%) |
| Placebo Bid | 0/35 (0%) | 0/35 (0%) | 18/35 (51.4%) |
| Event | 500mg HTD1801 Bid | 1000mg HTD1801 Bid | Placebo Bid |
|---|---|---|---|
| Joint InjuryInjury, poisoning and procedural complications | 1/22 | 0/31 | 0/35 |
| Stoma site haemorrhageInjury, poisoning and procedural complications | 0/22 | 1/31 | 0/35 |
| Intestinal obstructionGastrointestinal disorders | 0/22 | 1/31 | 0/35 |
| Clostridium difficile colitisInfections and infestations | 0/22 | 1/31 | 0/35 |
| Event | 500mg HTD1801 Bid | 1000mg HTD1801 Bid | Placebo Bid |
|---|---|---|---|
| DiarrhoeaGastrointestinal disorders | 0/22 | 7/31 | 0/35 |
| PruritusSkin and subcutaneous tissue disorders | 2/22 | 5/31 | 2/35 |
| Blood Alkaline Phosphatase IncreasedInvestigations | 0/22 | 0/31 | 5/35 |
| NauseaGastrointestinal disorders | 0/22 | 4/31 | 0/35 |
| NasopharyngitisInfections and infestations | 0/22 | 3/31 | 2/35 |
| PyrexiaGeneral disorders | 2/22 | 2/31 | 1/35 |
| Influenza Like IllnessGeneral disorders | 2/22 | 1/31 | 0/35 |
| Alanine Aminotransferase IncreasedInvestigations | 0/22 | 0/31 | 3/35 |
| Aspartate Aminotransferase IncreasedInvestigations | 0/22 | 0/31 | 3/35 |
| Gamma-Glutamyltransferase IncreasedInvestigations | 0/22 | 0/31 | 3/35 |
A total of 59 subjects were randomized into the study, 55 subjects were included in the safety population and 54 subjects were included in the modified intent-to-treat population (mITT). Four subjects were randomized but did not get study drug - two subjects were not started on study drug because of COVID-19, one subject did not meet eligibility criteria and one subject withdrew consent.
| Age, Continuous(years) | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID | Total |
|---|---|---|---|---|
| Mean | 43 ± 13.6 | 45 ± 13.7 | 40 ± 15.8 | 43 ± 14.2 |
| Sex: Female, Male(Participants) | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID | Total |
|---|---|---|---|---|
| Female | 4 | 10 | 9 | 23 |
| Male | 11 | 14 | 7 | 32 |
| Race (NIH/OMB)(Participants) | HTD1801 500 mg BID | HTD1801 1000 mg BID | Placebo BID | Total |
|---|---|---|---|---|
| American Indian or Alaska Native | 0 | 0 | 0 | 0 |
| Asian | 0 | 0 | 0 | 0 |
| Native Hawaiian or Other Pacific Islander | 0 | 0 | 0 | 0 |
| Black or African American | 1 | 4 | 2 | 7 |
| White | 14 | 19 | 13 | 46 |
| More than one race | 0 | 0 | 0 | 0 |
| Unknown or Not Reported | 0 | 1 | 1 | 2 |
PDFs hosted by the registry, ClinicalTrials.gov.
This study is completed, as verified in Aug 2026. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Studies of the drug tested here: Berberine ursodeoxycholate
HighTide Therapeutics (Hong Kong) Limited