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Mivelsiran

Phase 2

Down Syndrome-Associated Alzheimer's Disease (DS-AD) | Small molecule | Neurology |Alnylam Pharmaceuticals, Inc.|Last Updated: Sep 4, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment58

FDA Designations

No designations recorded

Clinical trial landscape

Mivelsiran · 1 trial · 1 indication

Phase 2 1
NCT07636811A Study to Evaluate Mivelsiran in Adult Participants With Early-Stage Down Syndrome-Associated Alzheimer's Disease (DS-AD)Down Syndrome-Associated Alzheimer's Disease (DS-AD)
RECRUITING58 Analytics
PHASE2RECRUITING
A Study to Evaluate Mivelsiran in Adult Participants With Early-Stage Down Syndrome-Associated Alzheimer's Disease (DS-AD)
Down Syndrome-Associated Alzheimer's Disease (DS-AD)Unlock trial analytics

Study Endpoints

Primary Endpoints

Double-Blind Period: Change from baseline in brain amyloid burden measured in centiloids (CLs)
Up to 24 months

Secondary Endpoints

Double-Blind Period: Change from baseline in APP protein concentration in cerebrospinal fluid (CSF)
Up to 24 months
Double-Blind Period: Change from baseline in the concentration of amyloid beta proteins in CSF
Up to 24 months
Double-Blind Period: Change from baseline in the concentration of tau proteins in plasma
Up to 24 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Mivelsiran (Treatment Group A)EXPERIMENTALParticipants will be administered multiple low doses of mivelsiran.
Mivelsiran (Treatment Group B)EXPERIMENTALParticipants will be administered multiple high doses of mivelsiran.
Placebo (Treatment Group C)PLACEBO_COMPARATORParticipants will be administered multiple doses of placebo.

Interventions

NameTypeDescription
MivelsiranDRUGMivelsiran will be administered intrathecally
PlaceboDRUGPlacebo will be administered intrathecally
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Eligibility Criteria

Age Range40 Years to 55 Years
SexALL
Healthy VolunteersNo
Study Sites3

Inclusion Criteria: * Clinical diagnosis of Down-Syndrome (DS) associated with trisomy 21 * Positive amyloid PET scan * Cognitively stable in the opinion of the investigator * Seizures must be well controlled with no occurrence of seizures in the 6 months prior to screening Exclusion Criteria: * ...

Countries:United StatesSpain
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Recent Changes (Last 90 Days)

LOWSep 4, 2026NCT07636811startDate: changed
LOWAug 12, 2026NCT07636811Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 12, 2026NCT07636811Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 15, 2026NCT07636811startDate: changed
LOWJul 15, 2026NCT07636811startDate: changed
LOWJun 9, 2026NCT07636811NEW_TRIAL: changed
LOWJun 9, 2026NCT07636811NEW_TRIAL: changed
LOWJun 9, 2026NCT07636811NEW_TRIAL: changed
LOWJun 9, 2026NCT07636811NEW_TRIAL: changed

Frequently asked questions about Mivelsiran

What is Mivelsiran used for?

Mivelsiran is an investigational small molecule being studied for the treatment of Down Syndrome-Associated Alzheimer's Disease (DS-AD) in adults. It is currently in Phase 2 clinical development and has not been approved by regulatory authorities.

How does Mivelsiran work?

Mivelsiran is a small interfering RNA (siRNA) therapeutic, as indicated by its '-siran' suffix. It is designed to target and silence specific genes involved in the pathology of Down Syndrome-Associated Alzheimer's Disease, though the exact molecular target has not been disclosed.

Who is developing Mivelsiran?

Mivelsiran is being developed by Alnylam Pharmaceuticals, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ALNY. Alnylam is a leader in RNA interference therapeutics and is conducting the clinical development program for this asset.

What phase is Mivelsiran in?

Mivelsiran is currently in Phase 2 clinical development. It is being evaluated in a randomized, double-blind, placebo-controlled study in adult participants with early-stage Down Syndrome-Associated Alzheimer's Disease. The drug is investigational and has not received FDA approval.

What clinical trials is Mivelsiran in?

Mivelsiran is being studied in a Phase 2 clinical trial with the identifier NCT07636811. This trial is actively recruiting participants in the United States and aims to enroll 58 adults aged 40 years and older with early-stage Down Syndrome-Associated Alzheimer's Disease.

Is Mivelsiran the same as other drugs?

Mivelsiran is a distinct investigational drug developed by Alnylam Pharmaceuticals. No alternative names have been reported for this asset, and it is not known to be identical to any other approved or investigational medication.