Multiple Dose Study of Aducanumab (BIIB037) (Recombinant, Fully Human Anti-Aβ IgG1 mAb) in Participants With Prodromal or Mild Alzheimer's Disease (PRIME)
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ClinicalTrials.gov Identifier: NCT01677572 |
Recruitment Status :
Terminated
(Study was discontinued based on futility analysis conducted on Phase 3 trials (NCT02477800 and NCT02484547) and not based on safety concerns.)
First Posted : September 3, 2012
Last Update Posted : August 3, 2020
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Condition or disease | Intervention/treatment | Phase |
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Alzheimer's Disease | Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb) Drug: Placebo | Phase 1 |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 197 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Triple (Participant, Care Provider, Investigator) |
Primary Purpose: | Treatment |
Official Title: | A Randomized, Double-Blinded, Placebo-Controlled Multiple Dose Study to Assess the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of BIIB037 in Subjects With Prodromal or Mild Alzheimer's Disease |
Actual Study Start Date : | October 5, 2012 |
Actual Primary Completion Date : | July 31, 2019 |
Actual Study Completion Date : | July 31, 2019 |

Arm | Intervention/treatment |
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Experimental: Low-dose #1 Aducanumab
Intravenous doses of low-dose level #1 Aducanumab administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose administered approximately 4 weeks apart for up to an additional 112 doses.
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Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
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Experimental: Low-dose #2 Aducanumab
Intravenous doses of low-dose level #2 Aducanumab administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose administered approximately 4 weeks apart for up to an additional 112 doses.
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Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
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Placebo Comparator: Placebo (low dose group)
Intravenous doses of placebo administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
Drug: Placebo Placebo to mimic the low dose, mid-dose and high-dose treatment arms of the experimental intervention; administered by intravenous (IV) infusion on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses. |
Experimental: Mid-dose Aducanumab
Intravenous doses of mid-dose Aducanumab administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose administered approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
|
Placebo Comparator: Placebo (mid dose group)
Intravenous doses of placebo administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose administered approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
Drug: Placebo Placebo to mimic the low dose, mid-dose and high-dose treatment arms of the experimental intervention; administered by intravenous (IV) infusion on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses. |
Experimental: High-dose Aducanumab
Intravenous doses of high-dose Aducanumab administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose administered approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
|
Placebo Comparator: Placebo (high dose group)
Intravenous doses of placebo administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose administered approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
Drug: Placebo Placebo to mimic the low dose, mid-dose and high-dose treatment arms of the experimental intervention; administered by intravenous (IV) infusion on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses. |
Experimental: Aducanumab Titration
Intravenous doses of Aducanumab administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Aducanumab (recombinant, fully human anti-Aβ IgG1 mAb)
Participants will receive an infusion of Aducanumab on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic and assigned does levels. The infusion will be administered for approximately 1 hour. The study is conducted with a staggered, parallel group design, with the first 3 treatment arms conducted in parallel, 2 further treatment arms subsequently beginning in parallel and the 2 last treatment arms subsequently beginning in parallel. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses.
Other Names:
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Placebo Comparator: Placebo (Titration Group)
Intravenous doses of placebo administered approximately 4 weeks apart over approximately 52 weeks (a total of 14 doses). Qualifying participants can continue into the long-term extension at a dose approximately 4 weeks apart for up to an additional 112 doses.
|
Drug: Placebo
Placebo to mimic the low dose, mid-dose and high-dose treatment arms of the experimental intervention; administered by intravenous (IV) infusion on Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, and 365 (±2 days) at the study clinic. Qualifying participants can enter the long-term extension period at doses described in the treatment arms for up to an additional 112 doses. |
- Number of Participants with Adverse Events [ Time Frame: Baseline to week 518 ]
- Change from baseline in florbetapir-fluorine-18 (18F-AV-45F-AV-45) positron emission tomography (PET) imaging in certain brain areas. [ Time Frame: Day 1, Weeks 26, 54, End of year 2, 3, and 4 ]
- Multiple dose pharmacokinetic (PK) serum concentrations of Aducanumab [ Time Frame: Up to week 518 ]
- Change from Baseline in Incidence of Anti-Aducanumab Antibodies in Serum. [ Time Frame: Up to week 518 ]

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 50 Years to 90 Years (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Key Inclusion Criteria:
- Participants must be ambulatory.
- Participants must meet the following core clinical criteria as determined by the Investigator:
Prodromal Alzheimer's Disease (AD) (all of the criteria must apply):
- Mini Mental State Examination (MMSE) scores between 24-30 (inclusive)
- a spontaneous memory complaint
- objective memory loss defined as a free recall score of ≤27 on the Free and Cued Selective Reminding Test (FCSRT)
- a global Clinical Dementia Rating Scale (CDR) score of 0.5
- absence of significant levels of impairment in other cognitive domains
- essentially preserved activities of daily living, and an absence of dementia. OR
Mild Alzheimer's Disease (AD) criteria (all criteria must apply):
- Mini Mental State Examination (MMSE) scores between 20-26 (inclusive)
- a global Clinical Dementia Rating Scale (CDR) of 0.5 or 1.0
- meeting the National Institute on Aging-Alzheimer's Association core clinical criteria for probable AD.
- Participants must have a positive florbetapir positron emission tomography (PET) amyloid scan.
- Participants must consent to apolipoprotein E (ApoE) genotyping.
- Apart from clinical diagnosis of Alzheimer's Disease (AD), participant must be in good health.
- Must have a reliable informant or caregiver.
Key Exclusion Criteria:
- Any medical or neurological condition (other than Alzheimer's Disease) that might be a contributing cause of the participant's cognitive impairment.
- Have had a stroke or Transient Ischemic Attack (TIA) or unexplained loss of consciousness in the past 1 year.
- Clinically significant psychiatric illness in past 6 months.
- Seizure in the past 3 years.
- Poorly controlled diabetes mellitus.
- History of unstable angina, myocardial infarction, chronic heart failure, or clinical significant conduction abnormalities within 1 year prior to Screening.
- Indication of impaired renal or liver function.
- Have human immunodeficiency virus (HIV) infection.
- Have a significant systematic illness or infection in past 30 days.
- Brain MRI showing evidence of acute or sub-acute micro or macrohemorrhage, greater than 4 microhemorrhages, cortical infarct or greater than one 1 lunar infarct.
- Any contraindications to brain MRI or positron emission tomography (PET) scans.
- Negative positron emission tomography (PET) scan with any amyloid-targeting ligand within 48 weeks of Screening.
- Clinically significant 12-lead electrocardiogram (ECG) abnormalities.
- Alcohol or substance abuse in past 1 year.
- Taking blood thinners (except for aspirin at a prophylactic dose or less)
- Have changes in medications or doses of medication in past 4 weeks.
NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

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): NCT01677572

Study Director: | Medical Director | Biogen |
Responsible Party: | Biogen |
ClinicalTrials.gov Identifier: | NCT01677572 |
Other Study ID Numbers: |
221AD103 2012-000349-10 ( EudraCT Number ) |
First Posted: | September 3, 2012 Key Record Dates |
Last Update Posted: | August 3, 2020 |
Last Verified: | July 2020 |
Aducanumab BIIB037 |
Alzheimer Disease Dementia Brain Diseases Central Nervous System Diseases Nervous System Diseases Tauopathies |
Neurodegenerative Diseases Neurocognitive Disorders Mental Disorders Immunoglobulin G Immunologic Factors Physiological Effects of Drugs |