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ALN-6457

Phase 1/2

Prion Disease | Small Molecules | Neurology |Regeneron Pharmaceuticals, Inc.|Trials Updated: Sep 22, 2026

ALN-6457 development status

Highest phase Phase 1/2
Registered trials 1 across 1 sponsor since Sep 2026

ALN-6457 target and mechanism

ModalitySmall Molecules

Also known as ALN-PRNP

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment60

FDA Designations

No designations recorded

ALN-6457 clinical trials

ALN-6457 · 1 trial · 1 indication

Phase 1/2 1
NCT07832370A Trial of ALN-6457 in Adult Participants With Symptomatic Prion Disease (PrD)Prion Disease
NOT YET_RECRUITING60 Analytics
PHASE1/PHASE2NOT YET_RECRUITING
A Trial of ALN-6457 in Adult Participants With Symptomatic Prion Disease (PrD)
Prion DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Occurrence of Treatment Emergent Adverse Events (TEAEs)
Through Week 156
Severity of TEAEs
Through Week 156
Percentage change in concentration of Neurofilament Light chain (NfL) in plasma from baseline
Through Week 130

Secondary Endpoints

Concentration of Prion Protein (PrP) in CSF
Through Week 130
Change from baseline in concentration of PrP in CSF
Through Week 130
Concentration of ALN-6457 and its major metabolites in plasma
Through Week 130
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Dose EscalationEXPERIMENTAL -
Cohort ExpansionEXPERIMENTAL -

Interventions

NameTypeDescription
ALN-6457DRUGAdministered per the protocol
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo

Key Inclusion Criteria: 1. Participant must meet all of the criteria under either: 1. sporadic CJD as described in the protocol or 2. genetic PrD, as described in the protocol 2. Has a Body Mass Index (BMI) \<35 kg/m2 (inclusive) at the screening visit 3. Able to understand and complete tria...

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Competitive Landscape -Prion Diseases 3 trials (matched to "Prion Disease")

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Recent Changes (Last 90 Days)

LOWSep 22, 2026NCT07832370NEW_TRIAL: changed
LOWSep 22, 2026NCT07832370NEW_TRIAL: changed

Frequently asked questions about ALN-6457

What is ALN-6457?

ALN-6457 is an investigational small molecule being developed by Regeneron Pharmaceuticals, Inc. for the treatment of prion disease, a neurological condition. It is currently in Phase 1 clinical development and has not been approved by the FDA. The drug is designed for adult patients with symptomatic prion disease.

What is ALN-6457 used for?

ALN-6457 is being studied for the treatment of prion disease in adults with symptomatic disease. Prion disease is a rare, progressive neurological disorder. The drug is investigational and has not been approved for any indication. Its only clinical trial enrolls adults aged 18 years and older with symptomatic prion disease.

Who makes ALN-6457?

ALN-6457 is being developed by Regeneron Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker symbol REGN. Regeneron is the sponsor of the Phase 1 trial evaluating the drug in adult patients with symptomatic prion disease.

What phase is ALN-6457 in?

ALN-6457 is in Phase 1 clinical development. It is an investigational small molecule and has not received FDA approval. The single Phase 1 trial is currently not yet recruiting and is designed to enroll 60 adult participants with symptomatic prion disease.

What clinical trials is ALN-6457 in?

ALN-6457 is being evaluated in one Phase 1 trial, NCT07832370, titled A Trial of ALN-6457 in Adult Participants With Symptomatic Prion Disease (PrD). The trial has a controlled design, is not yet recruiting, and plans to enroll 60 participants aged 18 years and older of all sexes.