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REGN4461

Phase 3

Generalized Lipodystrophy | Monoclonal antibody | Metabolic |Regeneron Pharmaceuticals, Inc.|Trials Updated: Oct 13, 2026

REGN4461 development status

Highest phase Phase 3 (NCT06548100)
Phase scored for REGNPhase 2
Registered trials 8 across 2 sponsors since May 2018

REGN4461 target and mechanism

Molecular targetLEPR
Target classReceptor
ModalityMonoclonal antibody

Also known as Low-Dose REGN4461, Mibavademab

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials5
Total Enrollment91

FDA Designations

No designations recorded

REGN4461 clinical trials

REGN4461 · 5 trials · 4 indications

Phase 3 3Phase 2 2
NCT07220785Efficacy and Safety of Mibavademab in Adult and Pediatric Patients With Generalized LipodystrophyGeneralized Lipodystrophy
RECRUITING28 Analytics
NCT07220772A Study Evaluating Mibavademab Treatment of Obesity Due to Leptin (LEP) Gene Mutations in Children, Adolescents and AdultsMonogenic Obesity
RECRUITING4 Analytics
NCT06548100A Study of the Safety of Mibavademab in Pediatric and Adult Participants Switching From Metreleptin to Mibavademab for the Treatment of Generalized Lipodystrophy (GLD)Generalized Lipodystrophy
COMPLETED9 Analytics
PHASE3RECRUITING
Efficacy and Safety of Mibavademab in Adult and Pediatric Patients With Generalized Lipodystrophy
Generalized LipodystrophyUnlock trial analytics
PHASE3RECRUITING
A Study Evaluating Mibavademab Treatment of Obesity Due to Leptin (LEP) Gene Mutations in Children, Adolescents and Adults
Monogenic ObesityUnlock trial analytics
PHASE3COMPLETED
A Study of the Safety of Mibavademab in Pediatric and Adult Participants Switching From Metreleptin to Mibavademab for the Treatment of Generalized Lipodystrophy (GLD)
Generalized LipodystrophyUnlock trial analytics

Study Endpoints

Primary Endpoints

Change in Hemoglobin A1c (HbA1c)
Through 36 weeks of exposure to mibavademab

Part A

Percent change in fasting Triglycerides (TG)
Through 36 weeks of exposure to mibavademab

Part A

Occurrence of Treatment Emergent Adverse Events (TEAEs)
Up to 15 months

Part B

Severity of TEAEs
Up to 15 months

Part B

Concentrations of total mibavademab in serum
Up to 15 months

Part B

Percent change in Body Mass Index (BMI)
Baseline to Week 24
Incidence of treatment-emergent adverse events (TEAEs)
Up to week 68
Change from the highest serum estradiol observed during a 28-day period
Baseline to month 6
Absolute Change From Baseline in Participants With Elevated Baseline Hemoglobin A1c (HbA1c ≥7%) at Week 8
Baseline, Week 8

Absolute change from baseline in HbA1c for subgroup of participants with baseline HbA1c ≥7% reported

Absolute Change From Baseline in Fasting Glucose at Week 8
Baseline, Week 8

Absolute change from baseline in fasting glucose for subgroup of participants with baseline HbA1c ≥7% reported

Absolute Change From Baseline in Weighted Mean Glucose (WMG) at Week 8
Baseline, Week 8

Absolute change from baseline in WMG for subgroup of participants with baseline HbA1c ≥7% reported

Percent Change From Baseline in Fasting Triglycerides (TG) at Week 8
Baseline, Week 8

Percent change from baseline in participants with elevated baseline fasting TG (fasting TG ≥250 mg/dL) reported

Secondary Endpoints

Change in HbA1c compared to placebo
From baseline to week 20
Change in HbA1c
From baseline to week 52
Percent change in fasting TG compared to placebo
From baseline to week 20
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A: Arm AEXPERIMENTAL -
Part A: Arm BEXPERIMENTAL -
Part A: Arm CEXPERIMENTAL -
Part A: Arm DPLACEBO_COMPARATOR -
Part BEXPERIMENTAL -
MibavademabEXPERIMENTAL -
PlaceboPLACEBO_COMPARATOR -
Treatment AEXPERIMENTAL -
Treatment BEXPERIMENTAL -

Interventions

NameTypeDescription
MibavademabDRUGAdministered as per the protocol
PlaceboDRUGAdministered as per the protocol
Low-Dose REGN4461DRUGIV infusion loading dose or SC injection QW.
High-dose REGN4461DRUGIV infusion loading dose or SC injection QW.
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Eligibility Criteria

Age Range2 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites7

Key Inclusion Criteria: 1\. Diagnosis of congenital or acquired GLD as defined by Multi-Society Practice Guidelines For Part A only: 1. Participants ≥2 years of age at screening 2. At least one of the below criteria are fulfilled during screening (measurements can be repeated once during screenin...

Countries:United StatesBrazilFranceGermanyTurkey (Türkiye)PeruRussia
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Recent Changes (Last 90 Days)

LOWOct 13, 2026NCT07220772lastUpdatePostDate: changed
LOWOct 13, 2026NCT07220772lastUpdatePostDate: changed
MEDIUMOct 1, 2026NCT07235917primaryCompletionDate: changed
MEDIUMOct 1, 2026NCT07235917primaryCompletionDate: changed
LOWSep 11, 2026NCT07220785lastUpdatePostDate: changed
LOWSep 11, 2026NCT07220785lastUpdatePostDate: changed
MEDIUMAug 29, 2026NCT06548100TRIAL_REMOVED: changed
MEDIUMAug 29, 2026NCT06548100TRIAL_REMOVED: changed
MEDIUMAug 29, 2026NCT06548100TRIAL_REMOVED: changed
LOWAug 18, 2026NCT07220785lastUpdatePostDate: changed
LOWAug 18, 2026NCT07220785lastUpdatePostDate: changed
LOWAug 5, 2026NCT07220785lastUpdatePostDate: changed
HIGHJul 29, 2026NCT06548100Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJul 29, 2026NCT06548100Status: ACTIVE_NOT_RECRUITING → COMPLETED

Frequently asked questions about REGN4461

What is REGN4461 used for?

REGN4461 is being developed for the treatment of generalized lipodystrophy, a rare metabolic disorder. It is an investigational monoclonal antibody studied in a Phase 2 clinical trial that enrolled 16 patients with the condition. It has not been approved by the FDA and remains in clinical development.

What does REGN4461 target?

REGN4461 targets LEPR, the leptin receptor. It is a leptin receptor agonist antibody designed to activate LEPR signaling. By targeting this receptor, the drug aims to address metabolic abnormalities associated with generalized lipodystrophy, where leptin signaling is impaired.

Who is developing REGN4461?

REGN4461 is being developed by Regeneron Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker REGN. Regeneron is the sponsor of the clinical program evaluating the antibody in generalized lipodystrophy.

What phase is REGN4461 in?

REGN4461 is in Phase 2 development. A Phase 2 trial in generalized lipodystrophy has been completed. The drug is investigational and has not received FDA approval.

What clinical trials is REGN4461 in?

REGN4461 has been studied in one clinical trial, NCT04159415, titled "Study of REGN4461, a Leptin Receptor Agonist Antibody, in Patients With Generalized Lipodystrophy." This completed Phase 2 trial enrolled 16 patients across the United States, Peru, Russia, and Turkey, and was randomized, double-blind, and controlled.

Is REGN4461 the same as Low-Dose REGN4461?

Yes, Low-Dose REGN4461 is an alternative name for REGN4461. Both refer to the same monoclonal antibody developed by Regeneron Pharmaceuticals for generalized lipodystrophy.