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Safety Study of AADvac1, a Tau Peptide-KLH-Conjugate Active Vaccine to Treat Alzheimer's Disease

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT01850238
Recruitment Status : Completed
First Posted : May 9, 2013
Last Update Posted : October 12, 2015
Information provided by (Responsible Party):
Axon Neuroscience SE

Brief Summary:

This first-time-in-man study is mainly designed to assess the safety and tolerability of AADvac1 in the treatment of Alzheimer's disease.

AADvac1 is a vaccine directed against pathologically modified Alzheimer tau protein that is the main constituent of neurofibrillary tangles (NFTs), and is intended to be a disease-modifying treatment for Alzheimer's disease, i.e. to halt its progress.

As this study is a Phase I study focused on tolerability and safety, efficacy will be assessed in an exploratory manner.

Condition or disease Intervention/treatment Phase
Alzheimer Disease Biological: AADvac1 Other: Placebo Phase 1

Detailed Description:

AADvac1 is a candidate therapeutic vaccine for Alzheimer's disease that targets misfolded tau protein, a common denominator of neurofibrillary pathology. Based on preclinical results, the intervention is expected to reduce the number of neurofibrillary tangles, remove hyperphosphorylated tau protein and reduce the amount of oligomerized and insoluble pathological tau in the brain, to halt the spread of neurofibrillary pathology through the brain, and thus prevent associated cognitive decline.

The vaccine's antigenic determinant is a synthetic peptide derived from a tau protein sequence, which is coupled to keyhole limpet hemocyanin (KLH) and uses aluminum hydroxide (Alhydrogel) as an adjuvant.

At present AADvac1 is intended as an active immunotherapy for patients with diagnosed Alzheimer's disease (AD). Patients will receive 3 - 6 immunization doses; the raised titers of therapeutic antibodies and possible benefits of the treatment can extend beyond the duration of the study.

Because of the central role of pathological misfolded tau protein in the etiology of AD, the vaccine is expected to be more effective than active or passive immunotherapies aiming to eliminate the amyloid β plaques that have been clinically investigated so far.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 30 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A 3-months Randomized, Placebo-controlled, Parallel Group, Double-blinded, Multi-centre, Phase I Study to Assess Tolerability & Safety of AADvac1 Applied to Patients With Mild-Moderate Alzheimer's Disease With 3-months Open Label Extension
Study Start Date : May 2013
Actual Primary Completion Date : March 2015
Actual Study Completion Date : March 2015

Arm Intervention/treatment
Placebo Comparator: Placebo (adjuvant in saline solution)

Placebo patients will receive 1 dose of placebo per month over 3 months, for a total of 3 administrations.

Placebo consists of vaccine adjuvant in saline solution. Placebo is administered subcutaneously.

Other: Placebo
The placebo contains the same buffer and adjuvant as AADvac1, but lacks the API.
Other Name: (no other names)

Experimental: AADvac1

AADvac1 patients will receive 1 dose of AADvac1 per month over 3 months, for a total of 3 administrations.

AADvac1 is a vaccine (single-use vials with solution ready for injection) AADvac1 is administered subcutaneously.

Biological: AADvac1
AADvac1 is intended as an active vaccination for disease-modifying treatment of Alzheimer's disease.
Other Name: (no commercial or INN name assigned yet)

Primary Outcome Measures :
  1. Tolerability and safety profile of AADvac1 in patients with mild-to-moderate Alzheimer's disease [ Time Frame: Tolerability & safety are assessed over a period of 3 months / 3 administrations ]

    Safety is assessed via recording of all Adverse Events and Adverse Events

    Patients are observed via:

    • MRI
    • Clinical & neuro-psychiatric observation
    • Cognitive testing
    • ECG
    • Blood biochemistry, hematology, coagulation measurement
    • Urine analysis

Secondary Outcome Measures :
  1. Immunogenicity of AADvac1 [ Time Frame: Immune response to the vaccine will be assessed over 3 months / 3 administrations ]

    Measurement of:

    • Titres of antibodies reactive with AADvac1
    • Titres of antibodies reactive with Alzheimer tau protein
    • Antibody isotype profiles

Other Outcome Measures:
  1. Patient cognition [ Time Frame: 3 months / 3 administrations, with an optional 3 months open label extension phase (3+3 administrations) ]

    Tests used:

    • ADAS-Cog (Alzheimer's Disease Assessment Scale-cognitive subscale)
    • COWAT (Controlled oral word association test)
    • Category fluency

Information from the National Library of Medicine

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Ages Eligible for Study:   50 Years to 85 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Diagnosis of probable Alzheimer's disease based on the NINCDS/ADRDA criteria.
  2. MMSE 15-26.
  3. stable dose of Alzheimer's Disease treatment since 3 months before screening visit or being untreated.
  4. Hachinski Ischemia Scale ≤ 4.
  5. MRI consistent with the diagnosis of AD.
  6. Informed consent capability
  7. Written informed consent signed and dated by the patient & caregiver.
  8. Age between 50 and 85 years.
  9. Availability of partner/caregiver.
  10. Adequate visual and auditory abilities and German language skills for neuropsychological testing.
  11. Females either surgically sterile or 2+ years postmenopausal.
  12. Participant on stable doses of all medications for concomitant illnesses according to medical history for at least 30 days prior to Visit 1 if considered relevant by the investigator.
  13. Sexually active males must be using reliable contraception methods or be surgically sterile.

Exclusion Criteria:

  1. Pregnant women.
  2. Participation in another clinical trial within 3 months before Visit 1.
  3. Patients not expected to complete the clinical trial.
  4. Presence or history of allergy to components of the vaccine, if considered relevant by the investigator.
  5. Contraindication for MRI imaging (e.g. metallic endoprosthesis, stent implantation in the last 6 months).
  6. Any of the following detected by brain MRI:

    • Thromboembolic infarction
    • Other focal lesions which may be responsible for the cognitive status of the patient
    • More than one lacunar infarct with a diameter of less than 1.5 cm in any dimension
    • Any lacunar infarct in a strategically important location such as the thalamus, hippocampus of either hemisphere, head of the left caudate
    • White matter lesions involving more than 25% of the hemispheric white matter
  7. Surgery (under general anaesthesia) within 3 months prior to study entry and scheduled surgery during the whole study period.
  8. History and/or presence of autoimmune disease, if considered relevant by the investigator.
  9. Recent (≤3 years since last specific treatment) history of cancer (Exceptions: basal cell carcinoma, intraepithelial cervical neoplasia).
  10. Active infectious disease (e.g., Hepatitis B, C).
  11. Presence and/or history of Immunodeficiency (e.g., HIV).
  12. Significant systemic illness, if considered relevant by the investigator.
  13. Hypothyroidism (patients with corrected hypothyroidism are eligible for the study if treatment has been stable for 3 months before study entry)
  14. History of significant psychiatric illness such as schizophrenia, bipolar affective disorder or major depression.
  15. Current depressive episode (Geriatric Depression Scale GDS >5 at Visit 1).
  16. Metabolic or toxic encephalopathy or dementia due to a general medical condition.
  17. Alcoholism or substance abuse within the past year (alcohol or drug intoxication).
  18. Wernicke's encephalopathy
  19. History or evidence of any other CNS disorder that could be the cause of dementia (infectious or inflammatory/demyelinating CNS conditions, Creutzfeldt-Jakob disease, Parkinson's disease, Huntington's disease, brain tumour, subdural haematoma, etc.)
  20. History or evidence of cerebrovascular disease (ischemic or haemorrhagic stroke, transient ischemic attack), or diagnosis of possible, probable or definite vascular dementia.
  21. Epilepsy.
  22. Prior and/or current treatment with experimental immunotherapeutics including IVIG or any vaccines for AD.
  23. Current treatment with immunosuppressive drugs.
  24. Change in dose of standard treatments for AD or hypothyroidism within 3 months prior to visit 1.
  25. Change in dose of previous and current medications which the patient is taking because of consisting illnesses according medical history within the last 30 days prior to visit 1, if considered clinically relevant by the investigator.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01850238

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Medizinische Universitat Graz
Graz, Steiermark, Austria, 8036
Univeristätsklinik für Neurologie, PMU, Christian-Doppler Klinik
Salzburg, Austria, 5020
Medizinische Universitat Wien
Wien, Austria, 1090
Sponsors and Collaborators
Axon Neuroscience SE
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Principal Investigator: Reinhold Schmidt, Professor Medizinische Universität Graz
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
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Responsible Party: Axon Neuroscience SE
ClinicalTrials.gov Identifier: NCT01850238    
Other Study ID Numbers: AXON CO 18700
2012-003916-29 ( EudraCT Number )
First Posted: May 9, 2013    Key Record Dates
Last Update Posted: October 12, 2015
Last Verified: October 2015
Keywords provided by Axon Neuroscience SE:
Alzheimer disease
tau protein
neurofibrillary degeneration
Additional relevant MeSH terms:
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Alzheimer Disease
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Neurodegenerative Diseases
Neurocognitive Disorders
Mental Disorders