A Phase 1 interventional study of HL40626S tablets and HL40626S placebo in Skin Disease, Immune System Disease and Skin Diseases, Papulosquamous, sponsored by HighsLab Therapeutics Inc.. Recruiting at 2 sites in Australia. Open to participants aged 18 Years to 55 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-29.
Sponsored by HighsLab Therapeutics Inc. · Phase 1, Interventional, and Treatment
This is a single-centre, randomized, double-blind, placebo-controlled Phase 1 study to assess safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and immunogenicity of HL40626S tablets following single and multiple ascending oral doses to healthy adult participants aged 18-55 years.
In Part 1 (Single Ascending Dose, SAD), healthy participants are randomized to receive a single fasting oral dose of HL40626S tablets or matching placebo across five sequential ascending dose cohorts. Each cohort enrolls 8 participants. Sentinel dosing is implemented for every cohort to monitor initial safety before full cohort enrolment.
In Part 2 (Multiple Ascending Dose, MAD), healthy participants are randomized to receive once-daily fasting oral doses of HL40626S tablets or matching placebo for 14 consecutive days across three sequential ascending dose cohorts. Each cohort enrolls 8 participants. All decisions to escalate to the next dose cohort were reviewed and approved by an independent Safety Review Committee (SRC) following complete data review of the preceding cohort.
2,028 studies on the registry are indexed under Psoriasis; 275 are open to participants now.
This study's planned enrollment of 64 is below the median of 75 across 1,565 interventional studies indexed under Psoriasis.
Browse Psoriasis studies →This is the only study on the registry with HighsLab Therapeutics Inc. as lead sponsor.
Compared within Psoriasis, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Skin Diseases. The counts are of registry records indexed under each term, refreshed daily. How we classify →
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.
Exclusion Criteria:
Any of the following ECG findings at Screening, Admission and/or pre dose on Day 1:
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.
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.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Able to have children. For women this usually means from the first period until menopause, unless permanently unable to through surgery; for men, unless permanently sterile. Read who the line is about — participants, women, men, or their partners.
Criteria about it usually ask for contraception during the study and for a time after it.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
A blood test of average blood sugar over the past two to three months, given as a percentage or in mmol/mol. 6.5% (48 mmol/mol) or more is the usual threshold for diabetes, normally confirmed by a second test.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
The American Psychiatric Association’s manual of mental health diagnoses. DSM-5 (2013, revised as DSM-5-TR in 2022) replaced DSM-IV, and some studies still name the older edition. “Meets DSM criteria for …” means diagnosed by that edition’s diagnostic criteria, usually by a clinician in an interview.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
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.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Reproductive potential
Able to have children. For women this usually means from the first period until menopause, unless permanently unable to through surgery; for men, unless permanently sterile. Read who the line is about — participants, women, men, or their partners.
Criteria about it usually ask for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECG (electrocardiogram)
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HbA1c
A blood test of average blood sugar over the past two to three months, given as a percentage or in mmol/mol. 6.5% (48 mmol/mol) or more is the usual threshold for diabetes, normally confirmed by a second test.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
DSM diagnostic criteria
The American Psychiatric Association’s manual of mental health diagnoses. DSM-5 (2013, revised as DSM-5-TR in 2022) replaced DSM-IV, and some studies still name the older edition. “Meets DSM criteria for …” means diagnosed by that edition’s diagnostic criteria, usually by a clinician in an interview.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Healthy participants receive single fasting oral HL40626S tablets in five sequential dose-escalation cohorts. Sentinel safety evaluation is required before full cohort dosing.
Drug: HL40626S tablets
Healthy participants receive single fasting oral placebo tablets matching HL40626S, one dose per participant.
Drug: HL40626S placebo
Healthy participants receive once-daily fasting oral HL40626S tablets for 14 consecutive days across three sequential cohorts.
Drug: HL40626S tablets
Healthy participants receive once-daily oral matching placebo tablets for 14 days.
Drug: HL40626S placebo
Oral study tablets administered in a dose-escalation design
Inactive oral placebo tablets matching the active drug dose-escalation scheme
Parts 1 (SAD) and 2 (MAD): Incidence of Treatment-Emergent Adverse Events [Safety and Tolerability]
Assess incidence, severity, causality and clinical outcome of treatment-emergent adverse events (TEAEs) graded per CTCAE Version 6.0 to characterize the safety and tolerability of HL40626S in Part 1 (SAD) and Part 2 (MAD).
Time frame: From signed informed consent through Day 15 for SAD and Day 29 for MAD.
Parts 1 (SAD) and 2 (MAD): Incidence of serious adverse events (SAEs) [Safety and Tolerability]
Assess Incidence, severity, causality, and clinical outcome of serious adverse events (SAEs) graded per CTCAE Version 6.0 to characterize the safety and tolerability of HL40626S in Part 1 (SAD) and Part 2 (MAD).
Time frame: From signed informed consent through Day 15 for SAD and Day 29 for MAD.
Parts 1 (SAD) and 2 (MAD): Proportion of participants with clinically significant abnormal findings in physical examinations, vital signs, clinical laboratory tests, and 12-lead ECG assessments relative to baseline [Safety and Tolerability]
Abnormal findings from physical examinations, vital sign measurements, laboratory analyses and 12-lead ECG tracings are compared against each participant's baseline values to support the overall safety and tolerability assessment of HL40626S in Part 1 (SAD) and Part 2 (MAD).
Time frame: From signed informed consent through Day 15 for SAD and Day 29 for MAD.
Part 1 (SAD): Maximum observed plasma concentration (Cmax)
Calculate peak plasma HL40626S concentration following a single fasting oral administration
Time frame: Predose up to 5 days post single dose.
Part 1 (SAD): Time to maximum observed plasma concentration (Tmax)
Record the time point corresponding to the observed Cmax after single fasting oral administration.
Time frame: Predose up to 5 days post single dose.
Part 1 (SAD): Area under the plasma concentration-time curve from time zero to last measurable concentration (AUClast)
Calculate AUClast via plasma concentration data collected over the sampling period following single-dose administration.
Time frame: Predose up to 5 days post single dose.
Part 1 (SAD): Area under the plasma concentration-time curve extrapolated to infinite time (AUCinf)
Assess the area under the plasma concentration-time curve extrapolated to infinite time (AUCinf) following single dose of HL40626S.
Time frame: Predose up to 5 days post single dose.
Part 1 (SAD): Terminal elimination rate constant (Kel)
Calculate terminal elimination rate constant following single dose of HL40626S tablets.
Time frame: Predose up to 5 days post single dose.
Plan to share: No
No publications or documents are linked to this record.
Started Aug 2026 (actual). Primary completion is estimated for Feb 2027, 6 months after the start.
Of 137 industry-sponsored phase 1 interventional studies under Psoriasis, half reached primary completion within 10 months of starting (the median), counting those still running; a quarter within 4 and three quarters within 16. This study's planned 6 months is below that.
Counting every sponsor, half of 155 studies reached it within 10 months; a quarter within 5 and three quarters within 17.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet 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.