18-months Safety Follow-up Study of AADvac1, an Active Tau Vaccine for Alzheimer's Disease

Condition(s): Alzheimer's Disease
NCTId: NCT02031198

Official Title

An 18-months Open Label Phase I Follow-up Study on Patients With Alzheimer's Disease Who Have Completed the AADvac1 Phase I Study "AXON CO 18700"


This follow-up study continues to observe patients who have completed the phase 1 trial of AADvac1, for another 18 months.

Long-term safety and behavior of the immune response to AADvac1 over time are the main points of interest.

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.

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). According to need, patients will receive additional immunization doses beyond those administered in the preceding pase 1 trial; 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.


Eligibility Criteria

Gender Minimum Age Maximum Age Healthy Volunteers?
Both 50 Years 86 Years False

Inclusion Criteria:

1. Completion of visit V8 of the AADvac1 phase I study AXON CO 18700 (EUDRACT 2012-003916-29).

2. Informed consent capability (as determined by an independent neurologist/psychiatrist).

3. Written informed consent signed and dated by the patient and the caregiver.

4. Availability of a partner/caregiver knowing the patient and being able to accompany the patient to the visits

5. Adequate visual and auditory abilities and language skills to allow neuropsychological testing.

6. Female patients are only eligible for the study if they are either surgically sterile or at least 2 years postmenopausal.

7. Sexually active males must be using reliable contraception methods (i.e. condoms) or be surgically sterile.

Exclusion Criteria:

1. Pregnant women.

2. Participation in another clinical trial during the course of this study.

3. Contraindication for MRI imaging such as MRI-incompatible metallic endoprosthesis or MRI-incompatible stent implantation

4. History and/or presence of autoimmune disease, if considered relevant by the investigator.

5. Significant systemic illness (e.g., chronic renal failure, chronic liver disease, poorly controlled diabetes, poorly controlled congestive heart failure, congenital long QT syndrome, other deficiencies), if considered relevant by the investigator.

6. Current treatment with immunosuppressive drugs.

Interventions & Outcomes

Study Interventions & Types

Drug Intervention(s)

AADvac1 - Active immunization against pathological Alzheimer's disease tau protein

Study Outcomes

Primary Outcome(s)

Timeframe: Tolerability & safety are assessed over a period of 18+ months
Measure: Tolerability and safety profile of AADvac1 in patients with mild-to-moderate Alzheimer's disease
Description: 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
Safety Issue? Yes

Secondary Outcome(s)

Measure: Immunogenicity of AADvac1
Timeframe: Immune response to the vaccine will be assessed over 18 month
Description: Measurement of: Titres of antibodies reactive with AADvac1 Titres of antibodies reactive with Alzheimer tau protein Antibody isotype profiles
Safety Issue? No

Measure: Patient cognition
Timeframe: 18+ months
Description: Tests used: ADAS-Cog (Alzheimer's Disease Assessment Scale-cognitive subscale) COWAT (Controlled oral word association test) Category fluency
Safety Issue? Yes

Facility Locations

Research Study Facility Map

Map of facility locations for this research study.

Facility is recruiting
Facility is not yet recruiting
Unknown status

Clinical Research Study Facility Locations


Sozialmedizinisches Zentrum Ost (SMZ Ost) /Donauspital, Memory Clinic and Karl Landsteiner Institut for Amnestic disorders
Wien, A-1220 Austria

Medizinische Universitat Wien
Wien, 1090 Austria

Univeristätsklinik für Neurologie, PMU, Christian-Doppler Klinik
Salzburg, 5020 Austria

Medizinische Universitat Graz
Graz, Steiermark 8036 Austria

Related Keywords & Studies

Conditions and Diseases with Related Research Studies

  1. Alzheimer's Disease

Other Related Condition Keywords

  1. Alzheimer Disease

Related Alzheimer's Disease Research

  1. The Eyes Have it " : Ocular Saccade Abnormalities in Prodromal Alzheimer's Disease
  2. [18F]MK-3328 as a Possible Novel PET Tracer for the Detection of Brain Amyloid Plaques (MK-3328-002 AM1)
  3. 16w Interventional Study on Titration and Dose/Efficacy Assessment of Exelon in Chinese Alzheimer's Disease Patients
  4. 3-month Study of MSDC-0160 Effects on Brain Glucose Utilization, Cognition & Safety in Subjects With Alzheimer's Disease
  5. A 12 Week, Multicenter, Open Label Evaluation of Caregiver Preference, Safety and Tolerability of Exelon® Patch (Rivastigmine Transdermal) in Patients With Alzheimer's Disease
  6. A 24 Week Open-Label Extension to Study CENA713DUS44
  7. A 24 Week, Multicenter, Open, Evaluation of the Clinical Effectiveness of the Once-daily 10 cm^2 Rivastigmine Patch Formulation in Patients With Probable Alzheimer's Disease (EXTRA)
  8. A 24-Week Efficacy, Safety and Tolerability of Rivastigmine Patch Study in Patients With Probable Alzheimer's Disease
  9. A 36-Week Safety Extension Study of ELND005 as a Treatment for Agitation and Aggression in Alzheimer's Disease
  10. A Biomarker Study of Solanezumab in Patients With and Without Alzheimer's