Phase 1
Completed N=3
Positron Emission Tomography Study in Healthy Subjects to Determine the Relationship Between Plasma Concentration and Brain Target Occupancy of ASN51
Healthy Participants
Source: ClinicalTrials.gov NCT06390098 ↗
Enrolled (actual)
3
Serious AEs
0.0%
Results posted
May 2025
Primary outcomePrimary: Regional Total Volume of Distribution (VT) of [18F]-IMA601 in Frontal Lobe at Each Brain Scan — 14.09; 1.82; 4.76; 16.08 milliliters/cubic centimeter (mL/cm^3)
Summary
This is a phase 1, open-label, positron emission tomography (PET) study in healthy adult participants to determine the relationship between plasma concentration and brain target occupancy of ASN51 following a single oral dose.
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Regional Total Volume of Distribution (VT) of [18F]-IMA601 in Frontal Lobe at Each Brain Scan |
14.09; 1.82; 4.76; 16.08; 3.90; 4.55 | — |
| PRIMARY Regional VT of [18F]-IMA601 in Anterior Cingulate at Each Brain Scan |
16.35; 1.85; 5.41; 19.34; 4.28; 5.13 | — |
| PRIMARY Regional VT of [18F]-IMA601 in Caudate at Each Brain Scan |
10.20; 1.23; 3.21; 13.74; 3.19; 3.89 | — |
| PRIMARY Regional VT of [18F]-IMA601 in Putamen at Each Brain Scan |
15.38; 1.98; 5.41; 19.07; 4.37; 5.22 | — |
| PRIMARY Regional VT of [18F]-IMA601 in Accumbens at Each Brain Scan |
15.82; 1.69; 5.43; 21.14; 4.42; 5.36 | — |
| PRIMARY Regional VT of [18F]-IMA601 in Amygdala at Each Brain Scan |
16.40; 1.90; 6.36; 22.30; 4.76; 6.00 | — |
| PRIMARY Regional VT of [18F]-IMA601 in Cerebral White Matter at Each Brain Scan |
10.87; 1.72; 3.86; 12.72; 3.32; 3.80 | — |
| SECONDARY Number of Participants With Treatment-Emergent Adverse Events (TEAEs) and Serious TEAEs |
2; 0; 1; 0; 0; 0 | — |
| SECONDARY Number of Participants With Serious TEAEs up to 4 Weeks After Last Administration |
0; 0; 0; 0 | — |
| SECONDARY Number of Participants With Clinically Significant Abnormalities in Laboratory Parameters |
0; 0; 0; 0 | — |
| SECONDARY Number of Participants With Clinically Significant Changes in Vital Signs |
0; 0; 0; 0 | — |
| SECONDARY Number of Participants With Clinically Significant Abnormal Electrocardiogram (ECG) Findings |
0; 0; 0; 0 | — |
| SECONDARY Number of Participants With Clinically Significant Abnormal Physical Examinations |
0; 0; 0; 0 | — |
| SECONDARY Plasma Concentration of ASN51 at Each Post-dose PET Scan |
37.0; 192.0; 43.5; 93.0; 181.0; 189.0 | — |
| SECONDARY Estimated O-GlcNAcase Receptor Occupancy (RO) by Plasma Concentration of ASN51 and PET Scan |
92.2; 68.2; 84.5; 79.4; 89.7; 75.9 | — |
| SECONDARY Receptor Occupancy as Assessed by Plasma Concentration That Corresponds to 50% Occupancy (EC50) |
9.4 | — |
Eligibility Criteria
Inclusion Criteria
- Healthy as determined by the Investigator, based on a medical evaluation including medical history physical examination, neurological examination, laboratory tests and cardiac monitoring. A participant with a clinical abnormality or laboratory parameters outside the reference range for the population being studied may be included only if, in the opinion of the Investigator, the finding is (a) unlikely to introduce additional risk to the participant, (b) will not interfere with study procedures or confound study results, and (c) is not otherwise exclusionary
- Men or women aged 25-55 years, inclusive (age range was selected on grounds of radiation burden).
- Women of child-bearing potential (WOCBP) with partners of child-bearing potential must agree to use highly effective contraception from at least 28 days before first tracer dosing through 30 days after last dose of study medication. All WOCBP must have a negative pregnancy test result before administration of test article. Vasectomized partner is also an accepted a highly effective birth control method provided that partner is the sole sexual partner of the WOCBP trial participant and that the vasectomized partner has received medical assessment of the surgical success.
- WOCBP must be postmenopausal (the last menstrual period was at least 12 months ago, and follicle-stimulating hormone at screening confirms postmenopausal status, or have no uterus, ovaries, or fallopian tubes). Women who are surgically sterile must provide documentation of the procedure by an operative report or by ultrasound.
- Non-sterilized male participants who are not abstinent and intend to be sexually active with a female partner of childbearing potential must use a male condom plus spermicide from 1 day prior to the first tracer administration throughout the total duration of the treatment period and 90 days after the last dose of study drug. Periodic abstinence, the rhythm method, and the withdrawal method are not acceptable methods of contraception. Male participants should refrain from sperm donation throughout this period.
- Body weight > 50.0 kilograms (kg) for men and > 45.0 kg for women and Body Mass Index within the range 18.5-30.0 kilograms per square meter (kg/m^2) (inclusive).
- Participants must understand the nature of the study and must provide signed and dated written informed consent in accordance with local regulations before the conduct of any study-related procedures.
- Participants must be, in the opinion of the Investigator, able to participate in all scheduled evaluations, likely to complete all required tests, and likely to be compliant.
- Participants must be fluent in the local language.
- Participants must agree not to post any personal medical data related to the study or information related to the study on any website or social media site (e.g., Facebook, Twitter, etc.) until the trial has completed.
Exclusion Criteria
- A positive urine drug screen/alcohol test at Screening or Day -1.
- Any history of psychiatric disorders, including substance use disorders, according to the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) criteria.
- A diagnosis of intellectual disability (intellectual developmental disorder) or mental retardation.
- Significant suicide risk as assessed by the Columbia Suicide severity Rating Scale (C-SSRS)
- A positive Hepatitis B surface antigen or positive Hepatitis C antibody result at Screening.
- A positive test for human immunodeficiency virus (HIV) antibody at Screening.
- Alanine aminotransferase or aspartate aminotransferase levels greater than 1.5 times the upper limit of normal (ULN) at Screening or between Screening and first dose of tracer.
- Frequently used any tobacco-containing (e.g., cigar, cigarette, or snuff) or nicotine-containing product (e.g., nicotine chewing gum, nicotine plasters, or other product used for smoking cessation) within 3 months prior to first dose of tracer. Freq
Data sourced from ClinicalTrials.gov (NCT06390098). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication. Informational only — not medical advice.