CompletedPhase 1ACTRN12625000744459

A clinical study to compare the safety and tolerability of two formulations of a new Systemic Sclerosis drug in Healthy Participants - Part B

A 2-Part, Single-Dose, Multiple Period Crossover Relative Bioavailability Study of Asengeprast Ethanolamine (MEA) Salt Formulation vs Asengeprast Free Acid Formulation in Adult Healthy Volunteers - Part B


Sponsor

Certa Therapeutics Pty Ltd

Enrollment

33 participants

Start Date

Oct 27, 2025

Study Type

Interventional

Conditions

Summary

The purpose of this research is to compare 2 different formulations of a study drug called asengeprast. The study will compare the safety, side effects, pharmacokinetics (the amount of study drug or any of its breakdown products in your body), of these two different formulations of a single oral dose (taken up to 3 times). This study will allow Certa to determine the doses and the type of formulation to take into future clinical trials in patients with Systemic Sclerosis. You may be eligible for this study if you are a healthy male or female volunteer aged 18 to 65 years of age who has met all inclusion criteria and do not meet any exclusion criteria. Part B involves participants receiving a single dose of the original form of asengeprast and then a single dose of asengeprast new formulation before and after a high fat meal. Therefore, participants in Part B will receive a total of 3 single doses of the study drug. Participants will be screened and if eligible (i.e. they meet all of the inclusion criteria and none of the exclusion criteria) participants will be enrolled into the study. Being enrolled means being admitted into the study centre on three occasions for a 3-night inpatient stay. You will also be required to attend the study centre on three occasions, following your discharge. All participants will have their vital signs (heart rate, blood pressure, oxygen saturation, temperature and respiratory rate) and ECGs checked, and will provide blood and urine samples for testing to ensure asengeprast is safe and well tolerated.


Eligibility

Sex: Both males and femalesMin Age: 18 YearssMax Age: 65 Yearss

Inclusion Criteria9

  • Participants must meet all the following criteria:
  • Must be capable of giving signed informed consent
  • Male or female participants between greater than or equal to 18 and less than or equal to 65 years of age (inclusive) at the screening visit.
  • In good general health without clinically significant medical history as determined by the investigator.
  • Body weight greater than or equal to 50 kg for males and greater than or equal to 47 kg for females and body mass index (BMI) within the range of 18.0 – 32.0 kg/m2 (inclusive)
  • Contraceptive Methods
  • a. Female subjects of child-bearing potential must agree to use highly effective contraceptive methods from the screening period to 90 days after the last dose of the study drug. In addition, they must abstain from egg collection or donation during the same period. The male partner of a female subject also needs to agree to use condoms during this period.
  • b. Male subjects considered fertile must agree to not plan to father a child, not donate sperm, and take effective contraceptive methods from the screening period to 90 days after the last dose of the study drug. The female partner of male subjects also needs to agree to use a highly effective method of female contraception during this period
  • Ability to follow study instructions and likely to complete all visits as assessed by the investigator.

Exclusion Criteria28

  • Participants are excluded from the study if any of the following criteria apply:
  • Any participant that has been enrolled and given IMP into Part A of the study are excluded from participating in Part B.
  • Have received any Investigational medicinal product (IMP) within 30 days or 5 half-lives prior to Screening, whichever is longer.
  • Have received a live attenuated vaccine within 60 days or a registered vaccine within 30 days prior to the first dose of the IMP or plans to receive such vaccines during the study.
  • Have used any prescription medications within the 14 days (or 5 half-lives, whichever is longer) prior to Day 1, and/or non-prescription drugs and herbal remedies (such as St. John's Wort [Hypericum perforatum]), within the 7 days prior to Day 1, or anticipate needing to take medications during the study period. Over-the-counter multivitamins will be permitted. If needed, paracetamol (less than or equal to 2 grams/day) may be used. Any questions regarding concomitant medications should be directed to the Sponsor.
  • Have a known allergy or sensitivity or contraindication to the IMP or its excipients.
  • Have any clinically significant abnormality at Screening determined by medical history, vital signs, physical examination, blood chemistry, haematology, urinalysis or a 12-lead electrocardiogram (ECG), including but not limited to:
  • a. Repeated measurement of systolic blood pressure 140 mmHg, diastolic blood pressure < 40 or >90 mmHg (inclusive), or pulse rate 100 bpm, pulse oximetry 1.5 × upper limit of normal (ULN). A single repeat of ALT is allowed within a single screening period to determine eligibility.
  • c. Bilirubin >1.5 × ULN (isolated bilirubin >1.5 × ULN is acceptable if bilirubin is fractionated and direct bilirubin 30 mg/g at screening. Note: eGFR calculated using CKD-EPI equation.
  • Have received blood products within 1 month prior to Screening.
  • Have a history of thyroidectomy or thyroid disease that required medication within the past 12 months.
  • Have had serious angioedema episodes within the previous 3 years or requiring angioedema medication in the previous two years.
  • Have a bleeding disorder diagnosed by a doctor (e.g. factor deficiency, coagulopathy, or platelet disorder requiring special precautions) or significant bruising or bleeding difficulties with blood draws in the opinion of the investigator, contraindicate blood draws.
  • Altered absorption and/or excretion of orally administered drugs e.g. Crohn’s disease, Gilbert’s syndrome, stomach or intestinal surgery etc.
  • Have a history of or current clinically significant gastrointestinal, hepatic, renal, cardiovascular, respiratory, endocrine, oncological, immunodeficiency, neurological, metabolic, haematological or autoimmune disorder; or a history of or current tuberculosis, epilepsy, diabetes or glaucoma as determined by the investigator.
  • Evidence of active or latent tuberculosis (TB) as documented by medical history and examination, and TB testing: a positive (not indeterminate) QuantiFERON-TB Gold test. NOTE: The QuantiFERON-TB Gold test is dependent on previous treatment(s). This test may not be suitable if previous treatment(s) produced significant immunosuppression.
  • Major surgery within 3 months prior to Day 1 or planned during the study period.
  • Presence of hepatitis B surface antigen or positive hepatitis C antibody or RNA test result at Screening. NOTE: participants with positive hepatitis C antibody due to prior resolved disease can be enrolled if a confirmatory negative hepatitis C RNA test result is obtained. NOTE: The RNA test is optional and participants with negative hepatitis C antibody test are not required to also undergo hepatitis C RNA testing.
  • Positive human immunodeficiency virus (HIV) antibody test.
  • Have a positive alcohol breath test or urine screen for drugs of abuse at Screening or Day -1, or evidence of drug or alcohol abuse in the investigator’s opinion.
  • History of drug/chemical or alcohol abuse within 6 months prior to Day -1. As a general rule, alcohol intake should not exceed 14 units per week (1 unit = 150 mL of wine, 360 mL of beer, or 45 mL of 40% alcohol/spirits) or positive alcohol breath test at screening and Day -1.
  • Use of tobacco or nicotine-containing products in excess of the equivalent of 5 cigarettes per day.
  • Consumption of red wine, grapefruit, or grapefruit -related citrus fruits (e.g., Seville oranges, pomelos, fruit juices) within 7 days prior to the first dose of asengeprast.
  • Are unable to provide a blood sample without undue trauma or distress.
  • Have a history of or current clinically relevant social, clinical, or psychiatric condition which, in the opinion of the investigator, makes the participant unsuitable for participation in the study.
  • Are pregnant, breastfeeding, or plan to become pregnant during the study period.
  • Lymphoma, leukemia, or any malignancy within the past 5 years except for basal cell or squamous epithelial carcinomas of the skin that have been resected with no evidence of metastatic disease for 3 years.
  • Have any other medical condition or significant co-morbidities, or any finding during Screening or Day -1, in the opinion of the investigator, may interfere with the study objectives or put the participants at risk.

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Interventions

This is Part B, a randomised sequence, single-dose, three -sequence, five-period, crossover study to assess the relative bioavailability of asengeprast MEA salt formulation vs asengeprast free acid fo

This is Part B, a randomised sequence, single-dose, three -sequence, five-period, crossover study to assess the relative bioavailability of asengeprast MEA salt formulation vs asengeprast free acid formulation in adult healthy volunteers. Approximately thirty-three (33) participants will be enrolled in a 3 sequence, 3 treatment period crossover with a single dose of asengeprast 400 mg free acid in a fasted state, and a single dose of MEA salt in both a fed and fasted state. It is anticipated that the selected MEA salt dose will be no more than 500 mg with the exact dose determined in part A of this study (ACTRN12625000733471). - This study consists of a 28-day screening period before proceeding to 3 treatment periods with follow-up visits. - In each of the treatment periods, participants will be confined to the clinic and will be discharged following completion of the last study procedure on Day 3. Participants will return to the clinic for an outpatient follow-up visit 7 days after the last dose of study drug. Participants will be randomised to receive a single oral dose of asengeprast (as free acid in a fasted state, and MEA salt in a fed and fasted state) within a 3 sequence, 3 period crossover study with at least a 7-day washout period between periods.. The treatment arms included in each sequence are; • 400 mg asengeprast free acid formulation (reference formulation), in a fasted state • Asengeprast MEA salt (test formulation), in a fasted state. • Asengeprast MEA salt (test formulation), in a fed state (after high fat high calorie meal). The Asengeprast MEA salt dose will be the same for fed and fasted treatment arms and will be determined in part A of this study (ACTRN12625000733471). Fasted state requires participants to fast overnight for at least 10 hours prior to dosing and until 4 hours after dosing. According to FDA guidance, a high fat meal consists of 800-1000 calories in which approximately 50% of calories from fat. An example of a high fat breakfast is two eggs fried in butter, two strips of bacon, two slices of toast with butter, four ounces (115 grams) of hash brown potatoes, eight ounces (240 mLs) of whole milk. Fasted and fed state and dose administration adherence will be monitored by the trial site during the confinement period at the Phase I unit. Pharmacokinetic (PK) blood samples for the analysis of asengeprast concentrations will be collected prior to dosing (0 hour) on Day 1 and up to 192 hours post-dose in each period. Therefore, plasma PK samples will be collected at 1 hour prior to pre-dose, then at 1, 2, 3, 4, 6, 8, 12, 24, 48 and Day 8: 144 - 192 hours post Day 1 dose in order to characterise the absorption phase. Adverse events (AEs) and concomitant medications will be assessed and recorded from the time of consent to the completion of the study follow-up visit. Safety and tolerability will be assessed by monitoring and recording of adverse events (AEs) and serious AEs (SAE), clinical laboratory test results, vital sign measurements, 12-lead electrocardiogram (ECG) results, and physical examination findings. Individual doses in the form of oral capsules will be provided for participants by phase I-unit staff on the day of administration in a suitable container. All participants will receive asengeprast formulations at the study site under the supervision of appropriate study personnel.


Locations(1)

Nucleus Network - Melbourne

VIC, Australia

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ACTRN12625000744459