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PROPEL

CompletedPhase 1

Single and Multiple Ascending Dose Study of Aducanumab (BIIB037) in Japanese Participants With Alzheimer's Disease

A Randomized, Double-Blind, Placebo-Controlled, Single and Multiple Ascending Dose Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Immunogenicity of Aducanumab (BIIB037) in Japanese Subjects With Mild to Moderate Alzheimer's Disease

Lead sponsor

Biogen

Asset

Aducanumab

Listed sites

7

Recruiting sites

-

Enrollment

21

actual

Study population

Alzheimer’s disease

Key I/E criteria

mild-to-moderate ADStudy partner/caregiver required

Primary endpoints

Incidence and nature of adverse events (AE) / serious adverse events(SAE)Clinically significant changes in vital signsBrain magnetic resonance imaging (MRI) findings to assess amyloid-related

Footprint

Where this trial recruits

Site locations as reported to ClinicalTrials.gov. Site count is not enrollment count; per-site enrollment is not available from source.

Identifiers

Registered as

Org study ID221AD104
NCT IDNCT02434718

Timeline

Milestones

Study first posted2015-05-05estimated
Study start2015-06-24actual
Primary completion2016-12-09actual
Study completion2016-12-09actual
Last update posted2020-08-21actual

Assets

Drug assets

Study populations

Who this study enrolls

Alzheimer’s disease

Eligibility

Who can enroll

Minimum age55 Years
Maximum age85 Years
SexAll
Healthy volunteersNot accepted

Inclusion criteria

Key Inclusion Criteria:

Must be ambulatory
Must have a clinical diagnosis of mild to moderate AD
Must be in good health as determined by the Investigator, based on medical history and Screening assessments
Must have a caregiver who, understands the study and assents to accompany the subject to all study site visits, provide information to the Investigator/study site staff, specifically about cognitive abilities and AEs/SAEs and return for per-protocol follow-up visits and procedures
Must consent to blood sample collection for deoxyribonucleic acid (DNA; genotyping) and ribonucleic acid (RNA; for potential future analysis)

Exclusion criteria

Any medical or neurological condition (other than AD) that in the opinion of the Investigator could be a contributing cause of the subject's dementia
Transient ischemic attack or stroke or any unexplained loss of consciousness within 1 year prior to Screening
Poorly controlled diabetes mellitus, as defined by having dosage adjustment of diabetic medication within the 3 months prior to Day 1
History of unstable angina, myocardial infarction, chronic heart failure
Chronic, uncontrolled hypertension
History of seizure within 3 years prior to Screening
History within the past 6 months or evidence of clinically significant psychiatric illness
History of severe allergic or anaphylactic reactions, or history of hypersensitivity to any of the inactive ingredients in the drug product

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply

Endpoints (11)

What's being measured

Protocol endpoints and posted registry outcome measures, grouped into outcome categories. Composite endpoints show their component event types. Standard codes (LOINC, SNOMED CT) are shown where available.

Coverage by outcome category

Safety / tolerability / PK
7
Other (unclassified)
3
Amyloid biomarkers
1

Amyloid biomarkers

1 endpoint
Primary/protocol endpoint

Brain magnetic resonance imaging (MRI) findings to assess amyloid-related imaging abnormalities (ARIA), including incidence of ARIA-E (edema) or ARIA-H (hemosiderosis)

Time frame:Up to week 42

event count, event

Safety / tolerability / PK

7 endpoints
Primary/protocol endpoint

Incidence and nature of adverse events (AE) / serious adverse events(SAE)

Time frame:Up to week 42

event count, event

Primary/protocol endpoint

Clinically significant changes in vital signs and 12-lead electrocardiogram (ECG) data; abnormalities in neurological and physical examinations

Time frame:Up to week 42

descriptive

Secondary/protocol endpoint

Area under the concentration-time curve (AUC) from time zero extrapolated to infinity (AUC0-∞)

Time frame:Up to 8 weeks post dosing

concentration, descriptive

Secondary/protocol endpoint

AUC from time zero to time of the last measurable concentration (AUC0-last)

Time frame:Up to 8 weeks post dosing

concentration, descriptive

Secondary/protocol endpoint

Maximum observed concentration (Cmax)

Time frame:Up to 8 weeks post dosing

concentration, descriptive

Secondary/protocol endpoint

Time to Cmax (Tmax)

Time frame:Up to 8 weeks post dosing

time to event, event

Secondary/protocol endpoint

Elimination half-life (t1/2)

Time frame:Up to 8 weeks post dosing

concentration, descriptive

Other (unclassified)

3 endpoints
Secondary/protocol endpoint/low confidence

Volume of distribution at steady state (Vss)

Time frame:Up to 8 weeks post dosing

descriptive

Secondary/protocol endpoint/low confidence

Clearance (CL) after a single IV infusion of aducanumab

Time frame:Up to 8 weeks post dosing

descriptive

Secondary/protocol endpoint/low confidence

Incidence of anti-aducanumab antibodies in serum

Time frame:Up to week 42

event count, event

Provenance

Sources

Trial identity, design, statusClinicalTrials.gov API v2
Snapshot dateJuly 21, 2026
Endpoint classificationDelfa ADRD endpoint taxonomy
Results tableno registry results posted yet

Trial facts come from public ClinicalTrials.gov records. Endpoint categories are Delfa's classification of those records, not a ClinicalTrials.gov field. All figures reflect the July 21, 2026 snapshot.