The Progressive Supranuclear Palsy Clinical Trial Platform - Regimen A: AADvac1

NCT ID: NCT07217665

Last Updated: 2025-10-16

Basic Information

• Recruitment Status: NOT_YET_RECRUITING
• Clinical Phase: PHASE2
• Total Enrollment: 146 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-12-01
• Study Completion Date: 2029-07-31

Brief Summary

The Progressive Supranuclear Palsy Clinical Trial Platform (PTP) is a multi-center, multi-regimen clinical trial evaluating the safety and efficacy of investigational products for the treatment of PSP.

Regimen A will evaluate the safety and efficacy of a single study drug, AADvac1, in participants with PSP.

Detailed Description

The Progressive Supranuclear Palsy Clinical Trial Platform (PTP) is designed as a perpetual platform trial. This means that there is a single Master Protocol dictating the conduct of the trial. The PTP Master Protocol is registered as NCT07173803. Once a participant enrolls into the Master Protocol and meets all eligibility criteria, the participant will be eligible to be randomized into any currently enrolling regimen. All participants will have an equal chance to be randomized to all regimens that are active at the time of screening. If a participant is randomized to Regimen A: AADvac1, participants will complete a baseline assessment and be randomized in a 3:1 ratio to either active AADvac1 or matching placebo.

Participants must first enroll into the Master Protocol and be eligible to participate in the Master Protocol before being able to be randomly assigned to Regimen A.

For a list of enrolling sites, please see the PTP Master Protocol under NCT07173803.

Conditions

PSP - Progressive Supranuclear Palsy

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: QUADRUPLE

Study Groups

AADvac1

Group Type: EXPERIMENTAL

AADvac1

Intervention Type: BIOLOGICAL

AADvac1 administration: subcutaneous injection.

Matching Placebo

Group Type: PLACEBO_COMPARATOR

Matching Placebo

Intervention Type: BIOLOGICAL

Matching placebo administration: subcutaneous injection.

Interventions

AADvac1

AADvac1 administration: subcutaneous injection.

Intervention Type: BIOLOGICAL

Matching Placebo

Matching placebo administration: subcutaneous injection.

Intervention Type: BIOLOGICAL

Eligibility Criteria

Inclusion Criteria

1. Clinical diagnosis of possible or probable PSP Richardson's Syndrome as defined by the 2017 Movement Disorder Society (MDS) criteria.

2. Presence of PSP symptoms for ≤5 years at screening (based on the best judgment of the site PI).

3. Mini-Mental State Examination (MMSE) score at screening of ≥25.

4. Able to walk at least 10 steps with minimal assistance (e.g., one arm for safety, but not postural support).

5. Stable doses of permitted medications as described per protocol for 30 days prior to screening.

6. Resides at home or in the community (assisted living is acceptable).

7. As assessed by the site PI, participant is likely to be able to comply with the protocol for the duration of the study, and has adequate vision, hearing (hearing aid permitted), and literacy (English or Spanish) sufficient for compliance with the required testing procedures.

Exclusion Criteria

1. Females who are breastfeeding or pregnant (as documented by a urine pregnancy test) during screening, or plan to become pregnant during the study.

2. Females of childbearing potential who did not use a highly effective method of contraception within 28 days of screening and/or are not willing to use a highly effective method of contraception for the duration of their participation in the study.

3. Lacks good venous access such that multiple blood draws would be precluded.

4. Weighs less than 40kg, or more than 136kg at screening.

5. Blood transfusion within 4 weeks of screening.

6. Contraindications to MRI studies, including metal (ferromagnetic) implants, a cardiac pacemaker that is not compatible with MRI, and/or severe claustrophobia.

7. Screening MRI scan showing structural evidence of alternative pathology not consistent with PSP that could explain a substantial portion of the participant's symptoms as indicated by the central MRI read.

8. Any unstable and/or clinically significant medical condition likely to hamper the evaluation of safety and/or efficacy of study drug (e.g., clinically significant reduction in serum B12 or folate levels, clinically significant abnormalities of thyroid function, stroke, or other cerebrovascular or cardiovascular conditions), as per the site PI's judgment.

9. History of severe allergic reaction (e.g., anaphylaxis) including but not limited to: severe allergic reaction to previous vaccines, foods, and/or medications.

10. Hospitalization within 30 days prior to screening or baseline.

11. Infections or major surgical procedures within 3 months prior to screening, judged to be clinically significant by the site PI.

12. Myocardial infarction within 1 year prior to baseline, unstable angina pectoris, symptomatic congestive heart failure.

13. History of cancer within the past 5 years other than treated skin squamous cell carcinoma, basal cell carcinoma, and melanoma in-situ, localized prostate cancer not requiring treatment, or prostate or breast cancer, which have been fully removed and are considered cured.

14. History or presence of immunological or inflammatory conditions, including neurological disorders, meningitis or meningoencephalitis.

15. History or presence of epilepsy requiring ongoing use of antiepileptic medications. Antiepileptic medications are permitted for pain or psychiatric use per the protocol.

16. DSM-5 criteria for drug or alcohol abuse or dependence currently met within the past 5 years.

17. Clinically significant abnormal vital signs including sustained sitting blood pressure >160/100 mm Hg.

18. Diabetes mellitus with hemoglobin A1c (HbA1c) levels of ≥8.0%.

19. Known history of human immunodeficiency virus (HIV-1 or 2).

20. Known history of acute/chronic hepatitis B or C unless treated curatively.

• Minimum Eligible Age: 41 Years
• Maximum Eligible Age: 86 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Institute on Aging (NIA)

NIH

Sponsor Role: collaborator

Alzheimer's Therapeutic Research Institute

OTHER

Sponsor Role: collaborator

University of Southern California

OTHER

Sponsor Role: collaborator

Massachusetts General Hospital

OTHER

Sponsor Role: collaborator

University of California, San Diego

OTHER

Sponsor Role: collaborator

Alzheimer's Clinical Trials Consortium

OTHER

Sponsor Role: collaborator

Axon Neuroscience SE

INDUSTRY

Sponsor Role: collaborator

Adam Boxer

OTHER

Sponsor Role: lead

Responsible Party

Adam Boxer

Endowed Professor in Memory and Aging

Responsibility Role: SPONSOR_INVESTIGATOR

Principal Investigators

Adam Boxer, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

University of California, San Francisco

Irene Litvan, MD

Role: PRINCIPAL_INVESTIGATOR

University of California, San Diego

Julio Rojas-Martinez, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

University of California, San Francisco

Anne-Marie Wills, MD

Role: PRINCIPAL_INVESTIGATOR

Massachusetts General Hospital

Central Contacts

PTP Recruitment and Retention (RER) Team

Role: CONTACT

psp-participate@usc.edu

213-821-0569

Other Identifiers

R01AG085029

Identifier Type: NIH

Identifier Source: secondary_id

View Link

ATRI-015-A

Identifier Type: -

Identifier Source: org_study_id