ADvance II Study: DBS-f in Patients With Mild Alzheimer's Disease

Not Applicable

Completed

• Conditions: Alzheimer Disease
• Interventions: Device: DBS Off; Device: DBS-f On

• Registration Number: NCT03622905
• Lead Sponsor: Functional Neuromodulation Ltd

Brief Summary

The primary efficacy objective of this study is to test the hypothesis that DBS-f stimulation (ON) will slow cognitive and functional progression of AD, as compared to no stimulation (OFF), by measuring baseline (pre-implantation) to 12-month change in the integrated Alzheimer's disease rating scale (iADRS).

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2018-08-01
• Study First Submitted QC: 2018-08-08
• Study First Posted: 2018-08-09
• Study Start: 2019-08-01
• Primary Completion: 2024-02-19
• Study Completion: 2024-02-19
• Status Verified: 2024-11
• Last Update Submitted: 2024-11-03
• Last Update Posted: 2024-11-05

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 74

Inclusion Criteria

1. Informed consent signed by the subject and caregiver.

2. At least 65 years old

3. Probable Alzheimer's disease according to the National Institute of Aging Alzheimer's disease Association criteria.

4. Mild dementia according to the Clinical Dementia Rating (CDR) global rating of 0.5 or 1 at screening.

5. ADAS-cog-11 score of 10-24 inclusive at screening AND baseline (with a score ≥ 4 on ADAS-cog item 1).

6. Confirmation of Alzheimer's disease based on CSF biomarkers.

7. The patient has an available caregiver or other appropriate knowledgeable informant who can reliably report on daily activities and function and signs the informed consent for participation as such.

8. Patient must be a good surgical candidate for placement of a deep brain stimulator as judged by the DBS surgical team.

9. Fluency (oral and written) in the language in which standardized tests will be administered.

10. The patient is either

    1. taking a stable dose of cholinesterase inhibitor (AChEI) medication (donepezil, galantamine, or rivastigmine) for at least 60 days prior to signing the informed consent form OR

    2. the patient has previously had an intolerance/failure to cholinesterase inhibitor medications that can be documented AND there is no intention to modify the dose over the course of the study (NOTE: These medications may NOT be initiated, discontinued or modified during the 12-month control period).

       OR

    3. c) a physician has fully discussed the possibility of prescribing cholinesterase inhibitors and the physician in collaboration with the patient/caregiver have declined trying cholinesterase inhibitors and this discussion and decision are fully documented in the patient's medical records. This discussion occurred during the course of the patient's care, and not as a component of enrollment or discussion of participation in this clinical trial.

AND there is no intention to modify the dose over the course of the study (NOTE: These medications may NOT be initiated, discontinued or modified after study initiation for the 12-months control period).

Exclusion Criteria

1. NPI total score ≥ 10 or score ≥ 4 in any NPI domain (clinically significant neuropsychiatric symptoms). Apathy score ≥ 4 acceptable.
2. Modified Hachinski ischemia scale score > 4 at screening.
3. At risk for suicide in the opinion of the investigator or the subject answers "yes" to "Suicidal Ideation" Item 4 or 5 on the C-SSRS (at the time of evaluation) at the screening visit or attempted suicide within the last 2 years.
4. Suffers from a major psychiatric disorder such as schizophrenia, bipolar disorder or major depressive disorder, or has current alcohol or substance abuse based on psychiatric consultation at screening visit.
5. History of moderate or more severe traumatic brain injury in the 2 years prior to signing the consent to participate in the study.
6. History of brain tumor, subdural hematoma, or other clinically significant (in the judgment of the investigator) space-occupying lesion on CT or MRI.
7. History of seizure disorder.
8. Contraindications for MRI scanning, including implanted metallic devices (e.g. non-MRI-safe cardiac pacemaker or neurostimulator; some artificial joints metal pins; surgical clips; or other implanted metal parts), or claustrophobia or discomfort in confined spaces.
9. Radiation exposure in the 1 year prior to signing the informed consent form that, in combination with the radiation exposure from this study, would exceed 5 rem.
10. Abnormal cardiovascular or neurovascular disorder that, in the opinion of the investigator would preclude participation in the study.
11. Currently prescribed or planning to start any amyloid-beta directed antibody drug (e.g. aducanumab or similar) within the first year following implantation in this study. Prior use of amyloid-beta directed antibody drugs must be stopped at least 6 months prior to signing consent.
12. Currently prescribed any non-AD medications that, in the opinion of the investigator would preclude participation in the study.
13. Is unable or unwilling to comply with protocol follow-up requirements.
14. Has a life expectancy of < 1 year.
15. Is actively enrolled in another concurrent clinical trial.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
DBS Off	DBS Off	DBS System Off
DBS On	DBS-f On	DBS system On

Primary Outcome Measures

Name	Time	Method
Change From Baseline Over Time at 12 months on the Ingegrated Alzheimer's Disease Rating Scale (iADRS) [ Time Frame: From Baseline to month 12 ]	12 months	The iADRS is a composite tool that combines scores from the Alzheimer's Disease Assessment Scale-Cognitive subscale (ADAS-Cog) and the Alzheimer's Disease Cooperative Study - instrumental Activities of Daily Living (ADCS-iADL). It measures both cognition and function and demonstrates acceptable psychometric properties, and is effective in capturing both disease progression and separation of placebo and active treatment effect. The iADRS score ranges from 0 to 146 with lower scores indicating worse performance.

Secondary Outcome Measures

Name	Time	Method
Change From Baseline Over Time at 12 months on the Clinical Dementia Rating Scale - Sum of Boxes (CDR-SB) [ Time Frame: From Baseline to month 12 ]	12 months	The CDR-SB is a validated clinical assessment of global function in patients with AD. Impairment is scored in each of 6 cognitive categories on a scale in which none = 0, questionable = 0.5, mild = 1, moderate = 2, and severe = 3. The 6 individual category ratings, or "box scores", can be added together to give the CDR-SB which ranges from 0 to 18 (severe impairment).

Trial Locations

Locations (21)

University of Florida; 🇺🇸 Gainesville, Florida, United States

Wake Forest Baptist Health; 🇺🇸 Winston-Salem, North Carolina, United States

Allegheny Health Network; 🇺🇸 Pittsburgh, Pennsylvania, United States

University of Texas; 🇺🇸 Austin, Texas, United States

University of Southern California; 🇺🇸 Los Angeles, California, United States

Universitätmedizin Charité Berlin; 🇩🇪 Berlin, Germany

Universitätklinikum Köln; 🇩🇪 Cologne, Germany

Technische Universität München; 🇩🇪 Munich, Germany

Universität Magdeburg; 🇩🇪 Magdeburg, Germany

Universitätsklinikum München: Klinik und Poliklinik für Psychiatrie und Psychotherapie Alzheimer Therapie- und Forschungszentrum; 🇩🇪 München, Germany

Barrow Neurological Institute; 🇺🇸 Phoenix, Arizona, United States

Saint Louis University; 🇺🇸 Saint Louis, Missouri, United States

Stanford University; 🇺🇸 Stanford, California, United States

Johns Hopkins University; 🇺🇸 Baltimore, Maryland, United States

University of South Florida; 🇺🇸 Tampa, Florida, United States

University of Nebraska Medical Center; 🇺🇸 Omaha, Nebraska, United States

University of Texas Health Sciences Center at San Antonio; 🇺🇸 San Antonio, Texas, United States

Toronto Western Hospital; 🇨🇦 Toronto, Ontario, Canada

Universitätsklinikum Schleswig Holstein Campus; 🇩🇪 Kiel, Germany

Universitätklinikum Würzburg; 🇩🇪 Würzburg, Germany

Rhode Island Hospital; 🇺🇸 Providence, Rhode Island, United States