First-in-Human Study for the Safety and Evaluation of Two 4R Tau Ligands as Potential PET Radioligands for Imaging Tau Protein in the Brain
First-in-Human Study for the Safety and Evaluation of Two 4R Tau Ligands ([18F]ABBV964i and [ 18F]ABBV-965i) as Potential PET Radioligands for Imaging Tau Protein in the Brain of Patients With Probable PSP and Healthy Volunteers
Invicro
24 participants
Nov 17, 2025
INTERVENTIONAL
Conditions
Summary
This clinical study is being conducted to learn more about two new imaging drugs, called \[18F\]ABBV-964i and \[18F\]ABBV-965i, which are designed to help doctors see changes in the brain related to a condition called Progressive Supranuclear Palsy (PSP). PSP is a rare disease that affects movement, balance, and thinking. These drugs are used with a type of scan called PET (Positron Emission Tomography) to show areas of the brain where a protein called tau builds up. Tau buildup is linked to PSP and other brain diseases. The main goal of this study is to find out if these imaging drugs are safe for people and if they work well to show tau in the brain. The study will also look at how the drugs move through the body and how much radiation they give off. Researchers hope this information will help develop better tools for diagnosing PSP and tracking how it changes over time. Who can join? Adults who are healthy or who have PSP may be able to take part. Participants will have screening tests to make sure they qualify. What does participation involve? People in the study will have PET scans, blood tests, and other safety checks. Some participants will also have an MRI scan. The study is divided into three parts: Part A checks radiation levels in healthy volunteers, Part B looks at how the drugs work in the brain of PSP patients and healthy volunteers, and Part C (optional) repeats scans to see if results are consistent. Why is this important? There is currently no cure for PSP, and better imaging tools could help researchers develop new treatments. By joining this study, participants will help advance research that may improve care for people with PSP and similar conditions in the future.
Eligibility
Inclusion Criteria8
- Males or females: PSP 40-80 years; HV 18-80 years
- Body weight: 43-120 kg (95-265 lb)
- Women of childbearing potential: abstinent or use 2 contraception methods (one barrier) during study and 30 days post last injection
- Men: use 2 contraception methods and refrain from sperm donation during study and 90 days post last injection
- Adequate circulation and normal clotting for arterial cannulation
- Sufficient mobility and ability to lie still for imaging
- Healthy Volunteers: informed consent, no clinically relevant findings, no cognitive impairment
- PSP Participants: informed consent or assent with LAR consent, clinical diagnosis per NINDS-SPSP criteria, MRI consistent with PSP, able to ambulate, tolerate MRI, comply with study procedures, caregiver available if needed
Exclusion Criteria13
- History of drug or alcohol abuse in past 12 months
- Clinically significant lab abnormalities or unstable illness
- Investigational drug/device use within 30 days
- Pregnant, lactating, or breastfeeding
- Significant comorbid conditions (GI, CV, hepatic, renal, etc.)
- Abnormal clotting parameters (if arterial sampling)
- MRI contraindications (implants, claustrophobia) for PSP participants
- Use of OTC meds or supplements within 2 weeks (healthy volunteers)
- Use of anti-hemostasis meds within 2 weeks of arterial line placement for PSP participants
- Unable to lie still for 90 minutes
- Major surgery or significant blood loss within 4 weeks
- Positive for Hepatitis B, Hepatitis C, or HIV
- Deemed unsuitable by Investigator
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Interventions
PET radiopharmaceuticals selective for tau, administered intravenously at doses up to 10 mCi.
PET radiopharmaceuticals selective for tau, administered intravenously at doses up to 10 mCi.
Preferred PET radiopharmaceuticals (between \[18F\]ABBV-964i and \[18F\]ABBV-965i) selective for tau, administered intravenously at doses up to 10 mCi.
Locations(1)
View Full Details on ClinicalTrials.gov
For the most up-to-date information, visit the official listing.
NCT07348276