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Phase 2 Study of AV-1959R in Individuals With Preclinical Alzheimer's Disease

14. september 2026 oppdatert av: Institute for Molecular Medicine

A Phase II, Randomized, Double-Blind Study to Evaluate Safety, Tolerability, Immunogenicity, and Amyloid-Lowering Effect of Amyloid-β Vaccine, AV-1959R, in Individuals With Preclinical Alzheimer's Disease.

This Phase 2 study will evaluate the safety, tolerability, immunogenicity, and amyloid-lowering effect of AV-1959R in cognitively unimpaired adults with preclinical Alzheimer's disease. Approximately 160 participants will be randomized to receive AV-1959R or placebo and will be followed for 78 weeks. The study will assess safety, immune responses, brain amyloid, and Alzheimer's disease-related biomarkers.

Studieoversikt

Status

Har ikke rekruttert ennå

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

This Phase 2 study is designed to further evaluate AV-1959R in cognitively unimpaired individuals with preclinical Alzheimer's disease, with emphasis on safety, tolerability, immunogenicity, and surrogate efficacy based on changes in Alzheimer's disease-related biomarkers and amyloid pathology

Studietype

Intervensjonell

Registrering (Antatt)

160

Fase

  • Fase 2

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

  • Voksen
  • Eldre voksen

Tar imot friske frivillige

Nei

Beskrivelse

Inclusion Criteria:

Male or female participants 55 to 80 years of age, inclusive, at screening. Signed informed consent before initiation of study-related procedures.

Cognitively unimpaired participants with preclinical Alzheimer's disease meeting all of the following:

CDR global score = 0 at screening. MMSE score ≥26 at screening, with education adjustment. Plasma p-tau217/Aβ1-42 ratio ≥0.00738. Vision and hearing sufficient to comply with study procedures, in the investigator's judgment.

Stable concomitant medications for management of existing medical conditions, as appropriate.

Women must be of non-childbearing potential as defined in the protocol. Men must meet protocol-defined contraception and sperm donation requirements. Ability, in the investigator's opinion, to understand the study and comply with study requirements.

Exclusion Criteria:

Screening MRI showing clinically significant abnormalities, including protocol-defined infarcts, excessive microbleeds, leptomeningeal hemosiderosis, superficial siderosis, or ARIA-E.

Contraindication to MRI. Serious illness requiring systemic treatment and/or hospitalization within 4 weeks before study entry.

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

Insulin-dependent diabetes. Clinically significant ECG abnormalities, including protocol-defined conduction abnormalities or QTc abnormalities.

Pre-existing autoimmune disease. History of seizure disorder, except protocol-permitted use of certain antiepileptic medications for chronic pain.

Any medical, psychological, or social condition that may interfere with participation, compliance, or 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 amyloid-beta or tau immunotherapy, including vaccine or monoclonal antibody, within 1 year before screening.

Recent use of protocol-defined immunomodulatory or growth-stimulating agents. Chronic use of protocol-defined anticoagulants or antiplatelet agents; aspirin is permitted.

Parenteral use of immunoglobulin preparations, blood products, or plasma derivatives.

History of severe local or systemic vaccine reactions or significant allergic reactions.

Clinically significant laboratory abnormalities at screening. Positive testing for HIV-1/2, hepatitis B surface antigen, or hepatitis C virus.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Forebygging
  • Tildeling: Randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Dobbelt

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: AV-1959R
Participants will receive AV-1959R 100 micrograms with adjuvant by intramuscular injection at Weeks 0, 4, and 44.
Investigational amyloid-beta vaccine, AV-1959R, 100 micrograms, administered intramuscularly with adjuvant at Weeks 0, 4, and 44.
Placebo komparator: Placebo
Participants will receive placebo with adjuvant by intramuscular injection at Weeks 0, 4, and 44.
Placebo administered by intramuscular injection with adjuvant at Weeks 0, 4, and 44.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Incidence of Treatment-Emergent Adverse Events (TEAEs)
Tidsramme: From first study intervention through Week 78
Number and percentage of participants with treatment-emergent adverse events.
From first study intervention through Week 78
Incidence of ARIA-E and ARIA-H
Tidsramme: Through Week 78
Number and percentage of participants with MRI-detected amyloid-related imaging abnormalities, including ARIA-E and ARIA-H.
Through Week 78
Clinically Significant Changes in Safety Assessments
Tidsramme: Through Week 78
Number and percentage of participants with clinically significant changes in vital signs, ECG, laboratory assessments, physical examinations, or neurological examinations.
Through Week 78
Change From Baseline in C-SSRS Score
Tidsramme: Baseline through Week 78
Change from baseline in Columbia-Suicide Severity Rating Scale score comparing AV-1959R and placebo groups.
Baseline through Week 78
Serum Anti-Amyloid-Beta Antibody Levels
Tidsramme: Baseline through Week 78
Serum anti-amyloid-beta antibody levels following vaccination, comparing AV-1959R and placebo groups.
Baseline through Week 78

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
T-cell responses to MultiTEP and amyloid-beta
Tidsramme: Baseline through Week 78
Assessment of MultiTEP-specific T-cell responses and autoreactive anti-amyloid-beta T-cell responses, comparing AV-1959R and placebo groups.
Baseline through Week 78
Change From Baseline in Global Brain Amyloid Burden
Tidsramme: Baseline to Week 78
Change from baseline in global brain amyloid burden measured by amyloid PET using the Centiloid scale, comparing the AV-1959R and placebo groups.
Baseline to Week 78
Change From Baseline in Plasma p-tau217/Aβ1-42 Ratio
Tidsramme: Baseline through Week 78
Change from baseline in plasma Lumipulse p-tau217/Aβ1-42 ratio, comparing the AV-1959R and placebo groups.
Baseline through Week 78

Andre resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Change From Baseline in CDR-SB Score
Tidsramme: Baseline to Week 78
Change from baseline in Clinical Dementia Rating-Sum of Boxes (CDR-SB) score, comparing the AV-1959R and placebo groups.
Baseline to Week 78
Change From Baseline in Plasma Amyloid Biomarkers
Tidsramme: Baseline through Week 78
Change from baseline in plasma Aβ42, Aβ40, and Aβ42/Aβ40 ratio, comparing the AV-1959R and placebo groups.
Baseline through Week 78
Change From Baseline in Plasma Tau Biomarkers
Tidsramme: Baseline through Week 78
Change from baseline in plasma BD-tau, MTBR-tau243, total tau, p-tau181, p-tau231, and p-tau217.
Baseline through Week 78
Change From Baseline in Plasma Neurofilament Light Chain
Tidsramme: Baseline through Week 78
Change from baseline in plasma neurofilament light chain (NfL).
Baseline through Week 78
Change From Baseline in Plasma GFAP
Tidsramme: Baseline through Week 78
Change from baseline in plasma glial fibrillary acidic protein (GFAP).
Baseline through Week 78
Change From Baseline in Brain Tau Burden
Tidsramme: Baseline to Week 78
Change from baseline in pathological tau accumulation measured by quantitative tau PET imaging, comparing the AV-1959R and placebo groups.
Baseline to Week 78
Changes in T-Cell and B-Cell Receptor Repertoires and Lineages
Tidsramme: Baseline through Week 78
Exploratory analysis of changes in T-cell receptor and B-cell receptor repertoires and T-cell and B-cell lineages in response to vaccination.
Baseline through Week 78

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Samarbeidspartnere

Etterforskere

  • Hovedetterforsker: Michael Agadjanyan, Institute for Molecular Medicine

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Antatt)

1. mars 2027

Primær fullføring (Antatt)

15. juni 2029

Studiet fullført (Antatt)

15. juni 2029

Datoer for studieregistrering

Først innsendt

14. september 2026

Først innsendt som oppfylte QC-kriteriene

14. september 2026

Først lagt ut (Faktiske)

18. september 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

18. september 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

14. september 2026

Sist bekreftet

1. september 2026

Mer informasjon

Begreper knyttet til denne studien

Andre studie-ID-numre

  • US-AV1959R-201

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

NEI

IPD-planbeskrivelse

Individual participant data are not planned to be shared.

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Ja

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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