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LY3884961

Phase 1/2

Gaucher Disease | Gene Therapies | Rare Disease |Eli Lilly and Company|Trials Updated: Oct 22, 2026

LY3884961 development status

Highest phase Phase 1/2 (NCT05487599)
Phase scored for LLYPhase 1
Registered trials 3 across 1 sponsor since Oct 2019

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDBiomarker
Total Trials3
Total Enrollment47

FDA Designations

No designations recorded

LY3884961 clinical trials

LY3884961 · 3 trials · 4 indications

Phase 1/2 3
NCT05487599A Clinical Trial of PR001 (LY3884961) in Patients With Peripheral Manifestations of Gaucher Disease (PROCEED)Gaucher Disease
ACTIVE NOT_RECRUITING8 Analytics
NCT04411654Phase 1/2 Clinical Trial of PR001 in Infants With Type 2 Gaucher Disease (PROVIDE)Gaucher Disease, Type 2
ACTIVE NOT_RECRUITING7 Analytics
NCT04127578Phase 1/2a Clinical Trial of PR001 (LY3884961) in Patients With Parkinson's Disease With at Least One GBA1 Mutation (PROPEL)Parkinson Disease
ACTIVE NOT_RECRUITING32 Analytics
PHASE1/PHASE2ACTIVE NOT_RECRUITING
A Clinical Trial of PR001 (LY3884961) in Patients With Peripheral Manifestations of Gaucher Disease (PROCEED)
Gaucher DiseaseUnlock trial analytics
PHASE1/PHASE2ACTIVE NOT_RECRUITING
Phase 1/2 Clinical Trial of PR001 in Infants With Type 2 Gaucher Disease (PROVIDE)
Gaucher Disease, Type 2Unlock trial analytics
PHASE1/PHASE2ACTIVE NOT_RECRUITING
Phase 1/2a Clinical Trial of PR001 (LY3884961) in Patients With Parkinson's Disease With at Least One GBA1 Mutation (PROPEL)
Parkinson DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence and severity of Treatment-emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs)
5 years

Treatment-emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs) with AE's graded as mild, moderate, or severe.

Number of Adverse Events (AEs), Serious Adverse Events (SAEs), and Adverse Events leading to discontinuation
Year 5
Immunogenicity of AAV9 and GCase in blood
Up to Year 2
Immunogenicity of AAV9 and GCase in CSF
Up to Year 1
Cumulative number of Treatment-Emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs)
5 years
Incidence of procedure or treatment-emergent AEs measured by brain MRI, spine MRI and nerve conduction study (NCS)
5 years
Treatment emergent immunogenicity of AAV9 in blood
Thru month 24
Change from baseline in immunogenicity of AAV9 in blood
Baseline and Month 24
Treatment emergent immunogenicity of GCase in blood
Thru Month 24

GCase (glucocerebrosidase)

Change from baseline in immunogenicity of GCase in blood
Baseline and Months 24

GCase (glucocerebrosidase)

Treatment emergent immunogenicity of Nfl in blood
Thru Month 24

GCase (glucocerebrosidase)

Change from baseline in immunogenicity of Nfl in blood
Baseline and Month 24

GCase (glucocerebrosidase)

Treatment emergent immunogenicity of AAV9 in CSF
Thru Month 24
Change in immunogenicity of AAV9 in CSF
Baseline and Month 12
Treatment emergent immunogenicity of GCase in CSF
Thru Month 24
Change in immunogenicity of GCase in CSF
Baseline, and Months 12

Secondary Endpoints

Spleen volume
5 years
Platelet count
5 years
GCase levels
5 years
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
LY3884961EXPERIMENTALLY3884961 is an advanced therapy investigational medicinal product administered as a single intravenous infusion.
Low DoseEXPERIMENTAL -
High DoseEXPERIMENTAL -
Dose Level 1EXPERIMENTAL -
Dose Level 2EXPERIMENTAL -

Interventions

NameTypeDescription
LY3884961GENETIC• LY3884961 is a replication-incompetent recombinant adeno-associated virus (AAV) vector. The vector is composed of a ss DNA genome packaged in an AAV-derived protein capsid.
MethylprednisoloneDRUGSingle IV pulse administered as concomitant medication.
SirolimusDRUGLoading dose, followed by maintenance doses, followed by dose tapering; administered as concomitant medication.
PrednisoneDRUGAdministered orally as concomitant medication, followed by dose tapering.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites5

Inclusion Criteria: 1. Age greater or equal to 18 years at the time of informed consent. 2. Bi-allelic pathogenic GBA1 variants must be centrally confirmed. 3. On ERT or SRT for at least 2 years and on a stable, maximum tolerated dose, for at least 3 months prior to screening. 4. Capable of giving ...

Countries:United StatesAustraliaGermanySpainUnited KingdomIsrael
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Recent Changes (Last 90 Days)

LOWOct 22, 2026NCT04411654lastUpdatePostDate: changed
LOWOct 22, 2026NCT04411654lastUpdatePostDate: changed
LOWOct 13, 2026NCT04127578lastUpdatePostDate: changed
LOWOct 13, 2026NCT04127578lastUpdatePostDate: changed
MEDIUMSep 19, 2026NCT04127578primaryCompletionDate: changed
MEDIUMSep 19, 2026NCT04127578primaryCompletionDate: changed
MEDIUMSep 19, 2026NCT04127578primaryCompletionDate: changed
LOWAug 20, 2026NCT04411654primaryCompletionDate: changed
LOWAug 20, 2026NCT04411654primaryCompletionDate: changed
LOWAug 20, 2026NCT04411654primaryCompletionDate: changed
LOWAug 20, 2026NCT04411654primaryCompletionDate: changed
HIGHAug 17, 2026NCT05487599Status: RECRUITING → ACTIVE_NOT_RECRUITING
HIGHAug 17, 2026NCT05487599Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about LY3884961

What is LY3884961?

LY3884961 is an investigational gene therapy being developed by Eli Lilly and Company for Gaucher disease and Parkinson disease. It is designed to deliver a functional copy of the GBA1 gene to address the underlying genetic cause of these conditions. It is currently in Phase 1 clinical development.

What is LY3884961 used for?

LY3884961 is being studied for the treatment of Gaucher disease, including type 2 Gaucher disease, and Parkinson disease. Clinical trials are evaluating it in patients with peripheral manifestations of Gaucher disease, infants with type 2 Gaucher disease, and Parkinson disease patients with at least one GBA1 mutation.

Who is developing LY3884961?

LY3884961 is being developed by Eli Lilly and Company, which trades on the New York Stock Exchange under the ticker symbol LLY. Lilly is conducting clinical trials of the gene therapy in the United States, Australia, Germany, Spain, the United Kingdom, and Israel.

What phase is LY3884961 in?

LY3884961 is in Phase 1 clinical development. It has not been approved by the FDA and remains an investigational therapy. The Phase 1 trials are currently active but not recruiting participants.

What clinical trials is LY3884961 in?

LY3884961 is being evaluated in three clinical trials: NCT05487599 (PROCEED) in patients with peripheral manifestations of Gaucher disease, NCT04411654 (PROVIDE) in infants with type 2 Gaucher disease, and NCT04127578 (PROPEL) in Parkinson disease patients with at least one GBA1 mutation. All are active but not recruiting.