A Phase 1 interventional study of QX-4533 and Placebo in Healthy, sponsored by QuantX Biosciences, Inc.. Recruiting at 1 site in Australia. Open to participants aged 18 Years to 55 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-07-15.
Sponsored by QuantX Biosciences, Inc. · Phase 1, Interventional, and Basic science
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The primary purpose of this study is to evaluate the safety and tolerability of QX-4533 following oral administration of single and multiple ascending doses in healthy participants.
This study will consist of 3 parts: Part 1: A randomized, double-blind, placebo-controlled single ascending dose (SAD) evaluation, including an open-label crossover food effect (FE) assessment in 1 cohort.
Part 2: A 14-day randomized, double-blind, placebo-controlled multiple ascending dose (MAD) evaluation.
Part 3: An open-label, 2-period crossover FE assessment.
QuantX Biosciences, Inc. is the lead sponsor of 2 studies on the registry; 2 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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Participants will receive a single oral dose of QX-4533 or placebo on Day 1, under fasting conditions.
Drug: QX-4533 · Drug: Placebo
Participants will receive multiple oral doses of QX-4533 or placebo, once daily for 14 days under fasting conditions.
Drug: QX-4533 · Drug: Placebo
Participants will receive single oral dose of QX-4533 on Day 1 of Period 1 under fasted condition (A) followed by single oral dose of QX-4533 on Day 1 of Period 2 under fed (high fat meal) condition (B).
Drug: QX-4533
Participants will receive a single oral dose of QX-4533 on Day 1 of Period 1 under fed (high fat meal) condition (B) followed by single oral dose of QX-4533 on Day 1 of Period 2 under fasted condition (A).
Drug: QX-4533
QX-4533 tablets
QX-4533 matched-placebo tablets
Number of Participants with Treatment-emergent Adverse Events (TEAEs)
Time frame: From enrollment through the safety follow-up visit (up to Day 9 [Part 1] and Day 23 [Part 2])
Number of Participants with Clinically Significant Change from Baseline in Clinical Laboratory Parameters
Time frame: From enrollment through the safety follow-up visit (up to Day 9 [Part 1] and Day 23 [Part 2])
Maximum Observed Plasma Concentration (Cmax)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Time of the Maximum Measured Concentration (Tmax)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Area Under the Concentration-Time Curve from Time Zero to the Last Quantifiable concentration-time point (AUClast)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Area Under the Concentration-Time Curve from Time Zero Extrapolated to Infinity (AUCinf)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Apparent Volume of Distribution at Steady State (Vz/F)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Apparent Clearance (CL/F)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Terminal Elimination Half-Life (t½el)
Time frame: Day 1 (Part 1); Day 1, Day 7, and Day 14 (Part 2)
Number of Participants with Clinically Significant Changes in Electrocardiogram (ECG) Findings
Time frame: From enrollment through the safety follow-up visit (up to Day 9 [Part 1] and Day 23 [Part 2])
Plan to share: No
No publications or documents are linked to this record.
Started Jul 2026 (actual). Primary completion is estimated for Dec 2026, 5 months after the start.
How these figures are worked out, and which studies are left out of them.
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QuantX Biosciences, Inc.