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REGN5459

Phase 1

Relapsed Multiple Myeloma | Small molecule | Oncology |Regeneron Pharmaceuticals, Inc.|Trials Updated: Sep 14, 2026

REGN5459 development status

Highest phase Phase 1
Registered trials 7 across 2 sponsors since Sep 2019

REGN5459 target and mechanism

Molecular targetBCMA
Target classProtein
ModalitySmall molecule

Also known as Vonsetamig, Noninterventional, BCMAxCD3

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials3
Total Enrollment176

FDA Designations

No designations recorded

REGN5459 clinical trials

REGN5459 · 3 trials · 4 indications

Phase 1 3
NCT06975787Dose Escalation Study With Bispecific Antibodies in Adult Participants With Lupus NephritisLupus Nephritis (LN)
RECRUITING90 Analytics
NCT05092347A Study to Learn How Safe and Tolerable Vonsetamig is in Adult Patients With Chronic Kidney Disease (CKD) Who Need Kidney Transplantation and Are Highly Sensitized to Human Leukocyte Antigen (HLA)Chronic Kidney Disease (CKD)
ACTIVE NOT_RECRUITING43 Analytics
NCT04083534First In Human (FIH) Study of REGN5459 in Adult Patients With Relapsed or Refractory Multiple Myeloma (MM)Relapsed Multiple Myeloma
COMPLETED43 Analytics
PHASE1RECRUITING
Dose Escalation Study With Bispecific Antibodies in Adult Participants With Lupus Nephritis
Lupus Nephritis (LN)Unlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
A Study to Learn How Safe and Tolerable Vonsetamig is in Adult Patients With Chronic Kidney Disease (CKD) Who Need Kidney Transplantation and Are Highly Sensitized to Human Leukocyte Antigen (HLA)
Chronic Kidney Disease (CKD)Unlock trial analytics
PHASE1COMPLETED
First In Human (FIH) Study of REGN5459 in Adult Patients With Relapsed or Refractory Multiple Myeloma (MM)
Relapsed Multiple MyelomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Occurrence of Dose Limiting Toxicities (DLT)
Up to 56 days
Occurrence of Treatment Emergent Adverse Events (TEAEs)
Through week 76
Severity of TEAEs
Through week 76
Incidence of adverse event(s) of interest (AEI) from the first dose through end of the safety observation period
Up to approximately 6 weeks
Incidence and severity of treatment-emergent adverse events (TEAE)s from the first study drug dose up to the end of the study
Up to 78 weeks

TEAEs include adverse events of special interest (AESI) and serious adverse events (SAEs)

Incidence of dose-limiting toxicities (DLTs) from the first dose through the end of the DLT observation period
Up to 35 Days

Phase 1

Incidence and severity of treatment-emergent adverse events (TEAEs) during REGN5459 treatment period
Up to 12 Weeks After the Last Dose

Phase 1

Incidence and severity of adverse events of special interest (AESI) with REGN5459 treatment period
Up to 12 Weeks After the Last Dose

Phase 1

Objective response rate (ORR) as measured using the International Myeloma Working Group (IMWG) criteria
Up to Approximately 104 Weeks

Phase 2

Secondary Endpoints

Proportion of participants no longer receiving a corticosteroid
At 6 months
Cumulative total exposure to corticosteroids
At 76 weeks
Absolute values of urine Protein-Creatinine Ratio (uPCR)
Through week 76
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Experimental Arm 1: VonsetamigEXPERIMENTAL -
Experimental Arm 2: OdronextamabEXPERIMENTAL -
VonsetamigEXPERIMENTAL -
REGN5459EXPERIMENTALCohorts of multiple REGN5459 dose levels

Interventions

NameTypeDescription
VonsetamigDRUGAdministered as per the protocol
OdronextamabDRUGAdministered as per the protocol
REGN5459DRUGAdministered by intravenous (IV) infusion
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Eligibility Criteria

Age Range18 Years to 60 Years
SexALL
Healthy VolunteersNo
Study Sites19

Key General Inclusion Criteria: 1. Diagnosis of Systemic Lupus Erythematosus (SLE) and LN, as described in the protocol 2. Participant must have refractory or relapsed disease, as described in the protocol Key General Exclusion Criteria: 1. History of or active severe or unstable lupus-associated...

Countries:United StatesFranceGermanySouth KoreaSpainTaiwan
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Competitive Landscape -Multiple Myeloma 338 trials (matched to "Relapsed Multiple Myeloma")

Recent Changes (Last 90 Days)

LOWSep 15, 2026NCT06975787lastUpdatePostDate: changed
LOWSep 15, 2026NCT06975787lastUpdatePostDate: changed
LOWSep 15, 2026NCT06975787lastUpdatePostDate: changed
LOWAug 14, 2026NCT06975787primaryCompletionDate: changed
LOWAug 14, 2026NCT06975787primaryCompletionDate: changed
LOWAug 14, 2026NCT06975787primaryCompletionDate: changed

Frequently asked questions about REGN5459

What is REGN5459?

REGN5459 is an investigational small molecule being developed by Regeneron Pharmaceuticals for relapsed or refractory multiple myeloma, a cancer of plasma cells in the bone marrow. It is a Phase 1 clinical-stage asset and has not been approved by the FDA. It was studied in a single first-in-human trial that has completed.

What is REGN5459 used for in relapsed multiple myeloma?

REGN5459 is being studied for the treatment of relapsed or refractory multiple myeloma in adults. The clinical program enrolled patients 18 years and older with relapsed or refractory disease. It remains investigational, and no approved use has been established for REGN5459 in multiple myeloma or any other indication.

What does REGN5459 target?

REGN5459 targets BCMA, or B-cell maturation antigen, a protein expressed on the surface of plasma cells. BCMA is a recognized target in multiple myeloma because it is highly expressed on malignant plasma cells. REGN5459 is described as a small molecule directed against this protein target.

Who is developing REGN5459?

Regeneron Pharmaceuticals, Inc. is developing REGN5459. Regeneron trades on the Nasdaq under the ticker REGN. The company sponsored the first-in-human Phase 1 study of REGN5459 in adult patients with relapsed or refractory multiple myeloma, which was conducted in the United States.

What phase is REGN5459 in?

REGN5459 is in Phase 1 development. Its only listed clinical trial, a first-in-human study in relapsed or refractory multiple myeloma, has completed. The program enrolled 43 patients. REGN5459 is investigational and has not received FDA approval for any indication.

What clinical trials is REGN5459 in?

REGN5459 has been evaluated in one clinical trial, NCT04083534, titled a First In Human Study of REGN5459 in Adult Patients With Relapsed or Refractory Multiple Myeloma. That Phase 1 trial is completed, enrolled 43 participants, was conducted in the United States, and was an uncontrolled study without randomization or blinding.