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Relapsed Multiple MyelomaPhase 1/2NCT04083534

First In Human (FIH) Study of REGN5459 in Adult Patients With Relapsed or Refractory Multiple Myeloma (MM)

A Phase 1/2 study testing REGN5459 in people with Relapsed Multiple Myeloma and Refractory Multiple Myeloma, run by Regeneron Pharmaceuticals at 7 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

In the phase 1 portion of the study, the primary objectives are to assess the safety, tolerability, and dose-limiting toxicities (DLTs) and to determine a recommended phase 2 dose regimen (RP2DR) of REGN5459 as monotherapy in patients with relapsed or refractory multiple myeloma (MM) who have exhausted all therapeutic… Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
REGN5459
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
43 participants
Where
7 sitesUnited States
Study dates
26 Sep 2019to 1 May 2025
Phase
Phase 1/2
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Eastern Cooperative Oncology Group (ECOG) performance status ≤1
  • Patients must have myeloma that is response-evaluable according to the 2016 International Myeloma Working Group (IMWG) response criteria
  • Measurable disease is defined as 1 or more of the following:
  • Serum M-protein ≥1 g/dL,
  • Urine M-protein ≥200 mg/24-hour, and/or
  • Free light chain (FLC) assay with involved FLC level ≥10 mg/dL with an abnormal serum FLC ratio
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  • A patient with Immunoglobulin A (IgA) myeloma but without measurable M-protein may be enrolled if quantitative IgA levels are ≥400 mg/dL and can be followed longitudinally
  • A patient with non-secretory MM may be considered for enrollment after discussion with the sponsor that includes the feasibility of an individualized plan for response assessment
  • Patients with MM who have exhausted all therapeutic options that are expected to provide meaningful clinical benefit, either through disease relapse, treatment refractory disease, or intolerance of the therapy, and including either:
  • Progression on or after at least 3 lines of therapy, or intolerance of therapy, including a proteasome inhibitor, an Immunomodulatory imide drug (IMiD), and an anti-CD38 antibody, OR
  • Progression on or after an anti-CD38 antibody and having disease that is "double refractory" to a proteasome inhibitor and an IMiD, or intolerance of therapy. The anti-CD38 antibody may have been administered alone or in combination with another agent such as a proteasome inhibitor. Refractory disease is defined as lack of response or relapse within 60 days of last treatment.
  • Adequate hematologic function as measured by:
  • Platelet count > 50 x 109/L. A patient may not have received a platelet transfusion within 7 days to meet this platelet eligibility requirement.
  • ANC > 1.0 x 109/L. A patient may not have received granulocyte colony stimulating factor (G-CSF) within 2 days to meet this absolute neutrophil count eligibility requirement.
  • Hemoglobin > 8.0 g/dL
  • Adequate hepatic function, defined as:
  • Total bilirubin ≤1.5 x ULN
  • Transaminase (ALT, AST) ≤2.5 x ULN
  • Alkaline phosphatase ≤2.5 x ULN
  • Patients with Gilbert syndrome do not need to meet this total bilirubin requirement provided that the total bilirubin is unchanged from the baseline value.
  • Serum creatinine clearance by Cockcroft-Gault >30 mL/min
  • A patient with a creatinine clearance by Cockcroft-Gault who does not meet eligibility criteria may be considered for enrollment if a measured creatinine clearance (based on 24-hour urine collection or other reliable method) is >30 mL/min
  • Life expectancy of at least 6 months

Who cannot join

  • Patients with known MM brain lesions or meningeal involvement
  • History of neurodegenerative condition or central nervous system (CNS) movement disorder, or patients with a history of seizure within 12 months before study enrollment are excluded
  • Cardiac ejection fraction <40% by echocardiogram or multi-gated acquisition scan (MUGA)
  • Prior treatment with any anti-BCMA antibody (including antibody-drug conjugate or bispecific antibody) or BCMA-directed CAR T therapy
  • Uncontrolled infection with human immunodeficiency virus (HIV), hepatitis B virus (HBV) or hepatitis C virus (HCV) infection; or other uncontrolled infection
  • Patients with HIV who have controlled infection (undetectable viral load and CD4 count above 350 cells/microliter either spontaneously or on a stable antiviral regimen) are permitted.
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  • Patients with hepatitis B (Hepatitis B Surface Antigen Test positive [HepBsAg+]) who have controlled infection (serum HBV DNA polymerase chain reaction [PCR] that is below the limit of detection AND receiving anti-viral therapy for hepatitis B) are permitted.
  • Patients who are HCV antibody-positive (HCV Ab+) who have controlled infection (undetectable HCV RNA by polymerase chain reaction (PCR) either spontaneously or in response to a successful prior course of anti-HCV therapy) are permitted.
  • History of allogeneic stem cell transplantation at any time, or autologous stem cell transplantation within 12 weeks of the start of study treatment
  • NOTE: Other protocol defined Inclusion/Exclusion Criteria apply.

Trial locations and contacts

7 sites in 1 country.

7 sites in 1 country

United States7 sites
  • Regeneron Study Site

    Ann Arbor, Michigan, 48109

  • Regeneron Study Site

    Dallas, Texas, 75390

  • Regeneron Study Site

    Houston, Texas, 77030

  • Regeneron Study Site

    Indianapolis, Indiana, 46202

  • Regeneron Study Site

    Milwaukee, Wisconsin, 53226

  • Regeneron Study Site

    New York, New York, 10029

  • Regeneron Study Site

    Rochester, Minnesota, 55905

Other trials in United States

About this study

Official title: Phase 1/2 FIH Study of REGN5459 (Anti-BCMA x Anti-CD3 Bispecific Antibody) in Patients With Relapsed or Refractory Multiple Myeloma

In the phase 1 portion of the study, the primary objectives are to assess the safety, tolerability, and dose-limiting toxicities (DLTs) and to determine a recommended phase 2 dose regimen (RP2DR) of REGN5459 as monotherapy in patients with relapsed or refractory multiple myeloma (MM) who have exhausted all therapeutic options that are expected to provide meaningful clinical benefit.

In the phase 2 portion of the study, the primary objective is to assess the preliminary anti-tumor activity of REGN5459 as measured by objective response rate (ORR).

Read more

In the phase 1 and phase 2 portion, the secondary objectives of the study are:

  • To assess the preliminary anti-tumor activity of REGN5459 as measured by duration of response (DOR), progression-free survival (PFS), rate of minimal residual disease (MRD) negative status, and overall survival (OS)
  • To evaluate the pharmacokinetic (PK) properties of REGN5459
  • To characterize the immunogenicity of REGN5459
  • To evaluate the effects of REGN5459 on patient-reported quality of life (QoL), symptoms, functioning and general health status

In the phase 1 portion of the study only, the secondary objective of the study is to assess the preliminary anti-tumor activity of REGN5459 as measured by ORR.

In the phase 2 portion of the study only, the secondary objective of the study is to evaluate the safety and tolerability of REGN5459.

Being tested
REGN5459
Medical subject headings
Multiple Myeloma

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • REGN5459Drug

    Administered by intravenous (IV) infusion

Study groups in NCT04083534
Study groupRoleWhat they receive
REGN5459ExperimentalCohorts of multiple REGN5459 dose levels
Receives: Drug: REGN5459

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Incidence of dose-limiting toxicities (DLTs) from the first dose through the end of the DLT observation period

    Phase 1

    Measured: Up to 35 Days

  2. Incidence and severity of treatment-emergent adverse events (TEAEs) during REGN5459 treatment period

    Phase 1

    Measured: Up to 12 Weeks After the Last Dose

  3. Incidence and severity of adverse events of special interest (AESI) with REGN5459 treatment period

    Phase 1

    Measured: Up to 12 Weeks After the Last Dose

  4. Objective response rate (ORR) as measured using the International Myeloma Working Group (IMWG) criteria

    Phase 2

    Measured: Up to Approximately 104 Weeks

Secondary outcomes (15)
  1. Concentrations of REGN5459 in the serum over time

    Phase 1 and phase 2

    Measured: Up to 12 Weeks After the Last Dose

  2. Incidence over time of anti-drug antibodies (ADAs) to REGN5459

    Phase 1 and phase 2

    Measured: Up to 12 Weeks After the Last Dose

  3. Duration of response (DOR) using the IMWG criteria

    Phase 1 and phase 2

    Measured: Up to Approximately 104 Weeks

  4. Progression-free survival (PFS) as measured using the IMWG criteria

    Phase 1 and phase 2

    Measured: Up to Approximately 104 Weeks

  5. Rate of minimal residual disease (MRD) negative status using the IMWG criteria

    Phase 1 and phase 2

    Measured: Up to Approximately 104 Weeks

  6. Overall survival (OS)

    Phase 1 and phase 2

    Measured: Up to Approximately 104 Weeks

  7. Patient-reported Quality of Life (QOL) per European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30)

    Phase 1 and phase 2

    The EORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including global health status/quality of life, functional Scales (physical, role, emotional, cognitive, and social) , symptom scales (fatigue, nausea and vomiting, and pain), and 6 single items (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial difficulties). Participants rate items on a 4-point scale, with 1 as "not at all" and 4 as "very much."

    Measured: Up to 12 Weeks After the Last Dose

  8. Patient-reported QOL per EORTC Quality of Life Questionnaire-Multiple Myeloma module 20 (EORTC QLQ-MY20)

    Phase 1 and phase 2

    The EORTC QLQ-MY20 is a self-administered instrument to assess QoL in persons with MM. This 20-item questionnaire measures the following domains: symptom scales, including disease symptoms (6 items) and symptoms related to side effects of treatment (10 items); function scale and future perspective (3 items); and body image (1 item). A high score represents a high level of symptoms or problems.

    Measured: Up to 12 Weeks After the Last Dose

  9. Patient-reported QOL per EuroQoL-5 Dimension-3 Level Scale (EQ-5D-3L)

    Phase 1 and phase 2

    The EQ-5D-3L is a self-administered generic standardized health status measure, consisting of an EQ-5D descriptive system and an EQ visual analog scale. The EQ-5D-3L descriptive system assesses 5 dimensions of health: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each dimension is rated on a 3-level scale: no problems, some problems, and extreme problems. The EQ visual analog scale component is a vertical visual analog scale used by patients to rate their health.

    Measured: Up to 12 Weeks After the Last Dose

  10. Change in patient-reported global health status/QOL per EORTC QLQ-C30

    Phase 1 and phase 2

    The EORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including global health status/quality of life, functional Scales (physical, role, emotional, cognitive, and social) , symptom scales (fatigue, nausea and vomiting, and pain), and 6 single items (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial difficulties). Participants rate items on a 4-point scale, with 1 as "not at all" and 4 as "very much."

    Measured: Baseline up to 12 Weeks After the Last Dose

  11. Time to definitive deterioration in patient-reported global health status/QOL per EORTC QLQ-C30

    Phase 1 and phase 2

    The EORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including global health status/quality of life, functional Scales (physical, role, emotional, cognitive, and social) , symptom scales (fatigue, nausea and vomiting, and pain), and 6 single items (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial difficulties). Participants rate items on a 4-point scale, with 1 as "not at all" and 4 as "very much."

    Measured: Up to 12 Weeks After the Last Dose

  12. Change in patient-reported general health status per EQ-5D-3L

    Phase 1 and phase 2

    The EQ-5D-3L is a self-administered generic standardized health status measure, consisting of an EQ-5D descriptive system and an EQ visual analog scale. The EQ-5D-3L descriptive system assesses 5 dimensions of health: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each dimension is rated on a 3-level scale: no problems, some problems, and extreme problems. The EQ visual analog scale component is a vertical visual analog scale used by patients to rate their health.

    Measured: Baseline up to 12 Weeks After the Last Dose

  13. ORR as measured using the IMWG criteria

    Phase 1 Only

    Measured: Up to Approximately 104 Weeks

  14. Incidence and severity of TEAEs during REGN5459 treatment period

    Phase 2 Only

    Measured: Up to 12 Weeks After the Last Dose

  15. Incidence and severity of AESI during REGN5459 treatment period

    Phase 2 Only

    Measured: Up to 12 Weeks After the Last Dose

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted10 Sep 2019
  2. Study start26 Sep 2019
  3. Primary completion1 May 2025
  4. Study completion1 May 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Sequential
Masking
None (open label)
Enrolment
43 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04083534
Sponsor's protocol ID
R5459-ONC-1888
Other IDs
2019-001108-39, 2019
Status last verified
Feb 2026
First submitted
29 Aug 2019
Last updated
4 May 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: All individual patient data (IPD) that underlie publicly available results will be considered for sharing

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing REGN5459 in people with Relapsed Multiple Myeloma and Refractory Multiple Myeloma, run by Regeneron Pharmaceuticals at 7 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 23 inclusion and 10 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 4 May 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 7 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Incidence of dose-limiting toxicities (DLTs) from the first dose through the end of the DLT observation period (time frame: Up to 35 Days). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 May 2026.

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