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A Proof-of-Concept Study to Learn Whether Linvoseltamab Can Eliminate Abnormal Plasma Cells That May Lead to Multiple Myeloma in Adult Patients With High-Risk Monoclonal Gammopathy of Undetermined Significance or Non-High-Risk Smoldering Multiple Myeloma

Phase 2 Dose-Ranging and Interception Study of Linvoseltamab in Patients With High-Risk Monoclonal Gammopathy of Undetermined Significance or Non-High-Risk Smoldering Multiple Myeloma

Who can join

Ages 18 and older · All sexes

Key Inclusion Criteria:

1. HR-MGUS or NHR-SMM as defined in the protocol
2. Eastern Cooperative Oncology Group (ECOG) performance status ≤1
3. Adequate hematologic and hepatic function, as described in the protocol
4. Estimated glomerular filtration rate (GFR) ≥30 mL/min/1.73 m\^2 by the Modification of Diet in Renal Disease (MDRD) equation

Key Exclusion Criteria:

1. High-risk SMM, as defined in the protocol
2. Evidence of any of myeloma-defining events, as described in the protocol
3. Diagnosis of systemic light-chain amyloidosis, Waldenström macroglobulinemia (lymphoplasmacytic lymphoma), solitary plasmacytoma, or symptomatic MM
4. Clinically significant cardiac or vascular disease within 3 months of study enrollment, as described in the protocol
5. Any infection requiring hospitalization or treatment with intravenous (IV) anti-infectives within 28 days of the first dose of linvoseltamab
6. Uncontrolled Human Immunodeficiency Virus (HIV), Hepatitis B Virus (HBV), or Hepatitis C Virus (HCV) infection; or other uncontrolled infection or unexplained signs of infection, as described in the protocol

NOTE: Other protocol defined inclusion/exclusion criteria apply

About the study

This study is researching an investigational drug called linvoseltamab ("study drug") in participants at moderate risk of developing multiple myeloma (about 3 to 10% average annual risk), a group that consists of patients with precancerous conditions called High-Risk Monoclonal Gammopathy of Undetermined Significance (HR-MGUS) and Non-High-Risk Smoldering Multiple Myeloma (NHR-SMM).

The primary purpose of the study is to understand how well the study drug can eliminate abnormal plasma cells and laboratory signs of HR-MGUS and NHR-SMM.

The study is looking at several other research questions, including:

* How many participants treated with linvoseltamab have improvement of their HR-MGUS or NHR-SMM? * What side effects may happen from taking the study drug? * How much study drug is in the blood at different times? * Whether the body makes antibodies against the study drug (which could make the drug less effective or could lead to side effects).

What is being tested

• Linvoseltamab (drug)

Sponsor: Regeneron Pharmaceuticals · Participants: 116 · Started: Sep 16, 2024

Contact the study team

• Clinical Trials Administrator · Phone: 844-734-6643

Official record on ClinicalTrials.gov — NCT06140524

Locations in the U.S.

Conditions

• Monoclonal Gammopathy of Undetermined Significance
• Smoldering Multiple Myeloma

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.