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ALN-APP

Phase 2

Cerebral Amyloid Angiopathy | Small molecule | Neurology |Alnylam Pharmaceuticals, Inc.|Last Updated: Sep 3, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment200

FDA Designations

No designations recorded

Clinical trial landscape

ALN-APP · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT06393712A Phase 2 Trial of ALN-APP in Patients With Cerebral Amyloid AngiopathyCerebral Amyloid Angiopathy
ACTIVE NOT_RECRUITING210 Analytics
PHASE2ACTIVE NOT_RECRUITING
A Phase 2 Trial of ALN-APP in Patients With Cerebral Amyloid Angiopathy
Cerebral Amyloid AngiopathyUnlock trial analytics

Study Endpoints

Primary Endpoints

Double-blind Treatment Period: Annualized Rate of New Lobar Cerebral Microbleeds (CMBs) Assessed on Magnetic Resonance Imaging (MRI) of Brain in Patients with Sporadic Cerebral Amyloid Angiopathy (sCAA)
Up to 24 months
Part A: Frequency of Adverse Events
Up to 12 months
Part B: Frequency of Adverse Events
Up to 42 months

Secondary Endpoints

Double-blind Treatment Period: Global Rank Based on Severity, Count, Symptom Burden, and Timing of New Clinical Hemorrhagic Events and Hemorrhagic Lesions Assessed on MRI of Brain
Up to 24 months
Double-blind Treatment Period: Change from Baseline Over Time in Cerebrovascular Vasoreactivity Measured by Blood Oxygenation Level Dependent (BOLD) Parameters with Visual-evoked Functional MRI
Up to 24 months
Double-blind Treatment Period: Incidence of New Cerebral Hemorrhagic Lesions and White Matter Hyperintensities Assessed on MRI of Brain
Up to 24 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ALN-APPEXPERIMENTALParticipants will be administered multiple doses of ALN-APP during the double-blind treatment period and optional open-label extension period.
Placebo/ALN-APPPLACEBO_COMPARATORParticipants will be administered multiple doses of placebo during the double-blind treatment period. Participants who continue into the optional open-label extension period will be administered multiple doses of ALN-APP.
Part A: ALN-APPEXPERIMENTALParticipants will be administered a single dose of ALN-APP.
Part A: PlaceboPLACEBO_COMPARATORParticipants will be administered a single dose of placebo.
Part B:EXPERIMENTALParticipants will be administered multiple doses of ALN-APP.

Interventions

NameTypeDescription
PlaceboDRUGPlacebo will be administered intrathecally
ALN-APPDRUGALN-APP will be administered intrathecally
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Eligibility Criteria

Age Range30 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites44

Inclusion Criteria (sporadic CAA patients): * Is 50 years or older * Has probable CAA per the Boston Criteria Version 2.0 Inclusion Criteria (Dutch-type CAA patients): * Is 30 years or older * Has known E693Q amyloid precursor protein (APP) gene mutation for Dutch-type CAA Exclusion Criteria: *...

Countries:United StatesAustraliaCanadaNetherlandsSwitzerlandUnited Kingdom
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Recent Changes (Last 90 Days)

MEDIUMSep 3, 2026NCT06393712Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMSep 3, 2026NCT06393712Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWAug 12, 2026NCT05231785lastUpdatePostDate: changed
LOWAug 12, 2026NCT05231785lastUpdatePostDate: changed
LOWJul 15, 2026NCT06393712lastUpdatePostDate: changed
LOWJul 15, 2026NCT05231785lastUpdatePostDate: changed
LOWJul 15, 2026NCT06393712lastUpdatePostDate: changed
LOWJul 15, 2026NCT05231785lastUpdatePostDate: changed
LOWJun 12, 2026NCT06393712lastUpdatePostDate: changed
LOWJun 12, 2026NCT05231785lastUpdatePostDate: changed
LOWJun 12, 2026NCT06393712lastUpdatePostDate: changed
LOWJun 12, 2026NCT05231785lastUpdatePostDate: changed

Frequently asked questions about ALN-APP

What is ALN-APP used for?

ALN-APP is an investigational small molecule being developed by Alnylam Pharmaceuticals for early-onset Alzheimer disease and cerebral amyloid angiopathy. It is currently in Phase 2 clinical development for cerebral amyloid angiopathy and has been studied in Phase 1 for early-onset Alzheimer disease.

What does ALN-APP target?

ALN-APP is an investigational small molecule designed to treat neurological conditions. While its specific molecular target is not publicly detailed, it is being studied in early-onset Alzheimer disease and cerebral amyloid angiopathy, both of which involve amyloid protein accumulation in the brain.

Who makes ALN-APP?

ALN-APP is developed by Alnylam Pharmaceuticals, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker ALNY. The company is conducting clinical trials of ALN-APP in multiple countries including the United States, Canada, Netherlands, and United Kingdom.

What phase is ALN-APP in?

ALN-APP is in Phase 2 clinical development for cerebral amyloid angiopathy, with an active Phase 2 trial that is not yet recruiting participants. It has also completed Phase 1 development for early-onset Alzheimer disease, and is not yet approved by regulatory authorities.

What clinical trials is ALN-APP in?

ALN-APP has two clinical trials. NCT05231785 is a Phase 1 study in early-onset Alzheimer disease, currently recruiting 60 participants in the US, Canada, Netherlands, and UK. NCT06393712 is a Phase 2 trial in cerebral amyloid angiopathy, enrolling 210 participants across the US, Australia, Canada, Netherlands, Switzerland, and UK.

Is ALN-APP the same as any other drug?

ALN-APP is the investigational name used by Alnylam Pharmaceuticals for this drug candidate. No alternative names have been reported in clinical trial registries, and it is distinct from other amyloid-targeting therapies in development.