Clinical trial Recruiting at 1 site Phase 1 Interventional Ages 18 to 65

First human trial of S-4321 for safety and tolerability

Official title: A Phase 1, Randomized, Placebo-Controlled, Double-Blind, Single and Multiple Ascending Dose Trial of S-4321 in Healthy Volunteers

Run by Seismic Therapeutic AU Pty Ltd · NCT06877611 · Data updated 2026-11-12

This study is testing a new drug called S-4321 to see if it's safe and how well it works in healthy adults.

More Healthy Volunteer Study trials

Quick facts

PhasePhase 1
Study typeInterventional
Ages18 Years to 65 Years
SexAll
Enrollment96 (estimated)
SponsorSeismic Therapeutic AU Pty Ltd
Industry-sponsored
Locations1 site (Bayswater, Victoria)
StatusRecruiting
StartedApril 3, 2025
Main results expectedApril 2026
Study endsApril 2026
Registry record updatedApril 15, 2025
Trial IDNCT06877611 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are healthy adults aged 18 to 65 with a BMI between 18 and 32 kg/m2.

Probably not a fit

Patients with a history of severe allergies, immunodeficiency disorders, or certain medical conditions may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial is a Phase 1, randomized, placebo-controlled, double-blind study designed to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamics of S-4321 in healthy adult volunteers. The study consists of two parts: Part 1 involves single ascending doses (SAD), while Part 2 focuses on multiple ascending doses (MAD). Participants will receive either the investigational drug or a placebo, and their responses will be closely monitored throughout the trial.

Why it matters

Potential benefit: If successful, this trial could provide critical safety and efficacy data for S-4321, paving the way for its use in future treatments.

How similar studies have gone: While this is a first-in-human trial for S-4321, similar Phase 1 studies have successfully established safety profiles for other investigational drugs.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Is available for the entire duration of the study and follow up.
2. Is willing and able to comply with all study assessments and adhere to the protocol schedule and restrictions.
3. Voluntarily consents to participation in the trial as documented by signing the study informed consent form (ICF).
4. Has a body mass index (BMI) within 18 to 32 kg/m2, inclusive, and weighs ≥45 kg.
5. Is in good physical and mental health in the opinion of the Investigator or delegate.

Major Exclusion Criteria:

1. Has a history of severe allergic or anaphylactic reaction as determined by the Investigator or delegate.
2. Is pregnant, nursing, or is planning to become pregnant or breastfeed during the trial.
3. Has a known immunodeficiency disorder.
4. Has a history of malignancy or confirmed cervical dysplasia.
5. Has a history of human immunodeficiency virus (HIV) or positive serology for HIV at Screening.
6. Has positive laboratory evidence for active hepatitis at screening.
7. Has any other condition or prior therapy that, in the opinion of the Investigator or delegate, may potentially compromise the safety or compliance of the participant, or may preclude the participant from successfully completing the study.

Other inclusion/exclusion eligibility criteria apply.

Where it's running

  • Veritus Research
    Bayswater, Victoria, Australia
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.