AV-1980R (Tau Vaccine) in Preclinical Alzheimer's Disease (TAURUS-1980)

Summary

This is a Phase 1, multicenter, randomized, double-blind, placebo-controlled, multiple-dose-escalation study evaluating the safety, tolerability, and immunogenicity of AV-1980R, an investigational vaccine targeting pathological tau, in participants with preclinical Alzheimer's disease. Up to 48 cognitively unimpaired adults aged 65 to 80 years with biomarker evidence of preclinical Alzheimer's disease will be enrolled into three ascending-dose cohorts.

Interventions

• AV-1980R 20 µg · BIOLOGICAL

  AV-1980R is an investigational recombinant protein tau vaccine based on the MultiTEP platform. Participants receive 20 µg of AV-1980R formulated with Advax-CpG55.2, consisting of Advax and CpG55.2, by intramuscular injection at Weeks 0, 4, and 38.

• AV-1980R 60 µg · BIOLOGICAL

  AV-1980R is an investigational recombinant protein tau vaccine based on the MultiTEP platform. Participants receive 60 µg of AV-1980R formulated with Advax-CpG55.2, consisting of Advax and CpG55.2, by intramuscular injection at Weeks 0, 4, and 38.

• AV-1980R 180 µg · BIOLOGICAL

  AV-1980R is an investigational recombinant protein tau vaccine based on the MultiTEP platform. Participants receive 180 µg of AV-1980R formulated with Advax-CpG55.2, consisting of Advax and CpG55.2, by intramuscular injection at Weeks 0, 4, and 38.

• Placebo · OTHER

  The placebo consists of 10 mM phosphate buffer without active AV-1980R, formulated with Advax-CpG55.2, consisting of Advax and CpG55.2. It is administered by intramuscular injection at Weeks 0, 4, and 38.

Published eligibility criteria

Verbatim from the registry. Only the site can decide how these apply to a specific patient.

Inclusion Criteria:

Male or postmenopausal or surgically sterile female, 65 to 80 years of age, inclusive.

Cognitively unimpaired participant with preclinical Alzheimer's disease who meets all of the following:

Clinical Dementia Rating global score of 0 at Screening. Mini-Mental State Examination score ≥26, with education adjustment at Screening.

Plasma p-tau217/Aβ42 ratio ≥0.00738 measured using Lumipulse (Fujirebio). A prior positive result obtained within 12 months before Screening may be accepted but must be confirmed by the central laboratory.

Sight and hearing, including use of a hearing aid, sufficient to comply with study procedures.

Stable concomitant medications. Participants receiving fluctuating medication or treatment may be considered if the underlying condition is controlled.

Signed informed consent before any study-related procedure. Ability, in the Investigator's opinion, to understand the study and comply with protocol requirements.

Exclusion Criteria:

Screening MRI showing any of the following:

More than one noncortical lacunar infarct greater than 1.5 cm. Any territorial infarct greater than 1.5 cm. Combined microbleeds and areas of leptomeningeal hemosiderosis greater than 5, or disseminated leptomeningeal hemosiderosis.

Any other significant cerebral abnormality, including ARIA-E. Contraindication to MRI, including non-MRI-safe implanted metallic devices or clinically significant claustrophobia.

Serious illness requiring systemic treatment or hospitalization within 4 weeks before study entry.

Clinically relevant cardiovascular, respiratory, gastrointestinal, endocrine, immunologic, hematologic, systemic disease, or major surgery that could interfere with participation or follow-up.

Insulin-dependent diabetes. Clinically relevant cardiac arrhythmia, palpitation, conduction abnormality, prolonged QT interval, or bundle branch block.

Pre-existing autoimmune disease. C-SSRS score of 3 or higher. History of seizure disorder, except permitted stable use of certain antiepileptic medications for chronic pain.

Any medical, psychological, or social condition that could interfere with participation, compliance, or participant safety.

Participation in another investigational drug study or use of an investigational drug within 30 days or 5 half-lives, whichever is longer, before dosing.

Prior tau or amyloid-beta immunotherapy within 1 year before Screening. Use of specified immunomodulatory or growth-stimulating treatments within 30 days before study entry.

Chronic use for more than 3 months of warfarin, other coumarin derivatives, anticoagulants, or an antiplatelet agent such as clopidogrel.

Parenteral immunoglobulin preparations, blood products, or plasma derivatives. History of severe local or systemic vaccination reactions or significant allergic reactions.

Clinically significant laboratory abnormalities at Screening, including ALT or AST greater than 1.5 times the upper limit of normal.

Positive testing for HIV-1 or HIV-2, hepatitis B surface antigen, or hepatitis C.

Sites (6)

• Comprehensive Center for Brain Health, Boca Raton, Florida · RECRUITING
• Palm Springs Community Health Center, Miami Lakes, Florida · RECRUITING
• Alzheimer's Research and Treatment Center (Stuart), Stuart, Florida · RECRUITING
• University of South Florida, Tampa, Florida · RECRUITING
• Alzheimer's Research and Treatment Center (Wellington), Wellington, Florida · RECRUITING
• Alzheimer's Research and Treatment Center (Columbus), Columbus, Georgia · RECRUITING