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Adult Outpatient Linvoseltamab With Tocilizumab Prophylaxis to Mitigate the Risk of Cytokine Release Syndrome (CRS)

A Phase 4, Single-Arm, Multicenter Study of Prophylactic Tocilizumab in Participants With Relapsed/Refractory Multiple Myeloma Treated With Linvoseltamab in the Outpatient Setting

Status
Recruiting
Phases
Phase 4
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07609940
Acronym
POPLIN
Enrollment
30
Registered
2026-05-27
Start date
2026-07-15
Completion date
2028-12-06
Last updated
2026-09-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Relapsed/Refractory Multiple Myeloma (RRMM)

Keywords

Cytokine Release Syndrome (CRS), Linvoseltamab, Tocilizumab, Bispecific antibodies

Brief summary

This study is researching whether the use of tocilizumab before the first dose of linvoseltamab will decrease the risk of Cytokine Release Syndrome (CRS) in participants who have Relapsed or Refractory Multiple Myeloma (RRMM) who have already been treated with at least four lines of treatment for their multiple myeloma, including medicines called a proteasome inhibitor, an immunomodulatory drug, and an anti-Cluster of Differentiation (CD) 38 antibody. The aim of the study is to see how safe, tolerable and effective linvoseltamab is when given after tocilizumab. The study is looking at several other research questions, including: * What side effects may happen from taking tocilizumab before the first dose of linvoseltamab * Whether tocilizumab has an impact on CRS, including whether participants require hospital care and, if so, how many hospital visits occur and how long they last * How frequently other medications (for example, corticosteroids or additional doses of tocilizumab) are used to support participants' care if needed

Interventions

DRUGLinvoseltamab

Administered per the protocol

DRUGTocilizumab

Administered per the protocol

Sponsors

Regeneron Pharmaceuticals
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

Key Inclusion Criteria: 1. Disease progression on or after at least 4 prior lines of therapy including a(n) Protease Inhibitor (PI), Immunomodulatory imide Drug (IMiD), and anti-CD 38 antibody 2. Eastern Cooperative Oncology Group (ECOG) performance status score ≤2 3. Confirmed progressive disease according to IMWG criteria during or after the most recent line of therapy Key

Exclusion criteria

1. Diagnosis of plasma cell leukemia, symptomatic amyloidosis (including myeloma-associated amyloidosis), Waldenström macroglobulinemia (lymphoplasmacytic lymphoma), or Polyneuropathy, Organomegaly, Endocrinopathy, Monoclonal protein, Skin changes (POEMS) syndrome 2. Known myeloma brain lesions or meningeal involvement 3. History of neurodegenerative condition, Progressive Multifocal Leukoencephalopathy \[PML\], or Central Nervous System (CNS) movement disorder NOTE: Other protocol defined inclusion/

Design outcomes

Primary

MeasureTime frame
Occurrence of any grade CRS per American Society for Transplantation and Cellular Therapy (ASTCT) gradingUp to 28 days
Severity of any grade CRS per ASTCT gradingUp to 28 days

Secondary

MeasureTime frameDescription
Occurrence of CRS of any gradeUp to 12 months
Occurrence of recurrent CRS of any gradeUp to 12 months
Occurrence of grade ≥2 CRS per ASTCT gradingUp to 12 months
Occurrence of recurrent grade ≥2 CRS per ASTCT gradingUp to 12 months
Occurrence of any grade infections per National Cancer Institute-Common Terminology Criteria for Adverse Events (NCI-CTCAE) version 5.0Up to 12 monthsNCI CTCAE grade 1 to 5 version 5.0
Occurrence of grade ≥3 infections per NCI-CTCAE version 5.0Up to 12 months
Occurrence of any grade Immune effector Cell-Associated Neurotoxicity Syndrome (ICANS) per ASTCT gradingUp to 12 months
Occurrence of grade ≥3 ICANS per ASTCT gradingUp to 12 months
Occurrence of any grade neurotoxicity per NCI-CTCAE version 5.0 gradingUp to 12 months
Occurrence of any grade neurotoxicity per ASTCT gradingUp to 12 months
Occurrence of grade ≥3 neurotoxicity per NCI-CTCAE version 5.0 gradingUp to 12 months
Occurrence of grade ≥3 neurotoxicity per ASTCT gradingUp to 12 months
Occurrence of any grade neutropenia per NCI-CTCAE version 5.0 gradingUp to 12 months
Occurrence of grade ≥3 neutropenia per NCI-CTCAE version 5.0 gradingUp to 12 months
Number of treatment doses of tocilizumab following at least 1 dose of linvoseltamab for the management CRSUp to 12 months
Number of treatment doses of corticosteroid following at least 1 dose of linvoseltamab for the management CRSUp to 12 months
Total duration of corticosteroid treatment following at least 1 dose of linvoseltamab for the management CRSUp to 12 months
Number of hospitalizations per participant treated with at least 1 dose of linvoseltamabUp to 12 months
Total length of each Adverse Event (AE)-related hospital stayUp to 12 months
Occurrence of Treatment-Emergent Adverse Events (TEAEs) in participants treated with at least 1 dose of linvoseltamabUp to 12 months
Severity of TEAEs in participants treated with at least 1 dose of linvoseltamabUp to 12 months
Occurrence of Adverse Events of Special Interest (AESI) in participants treated with at least 1 dose of linvoseltamabUp to 12 months
Severity of AESI in participants treated with at least 1 dose of linvoseltamabUp to 12 months
Occurrence of Serious Adverse Events (SAEs) in participants treated with at least 1 dose of linvoseltamabUp to 12 months
Severity of SAEs in participants treated with at least 1 dose of linvoseltamabUp to 12 months
Achievement of Partial Response or better (≥PR) per International Myeloma Working Group (IMWG) criteriaUp to 12 months
Duration Of Response (DOR)Up to 12 months
Progression-Free Survival (PFS)Up to 12 months
Overall SurvivalUp to 12 months
Time To Response (TTR)Up to 12 months

Countries

United States

Contacts

CONTACTClinical Trials Administrator
clinicaltrials@regeneron.com844-734-6643
STUDY_DIRECTORClinical Trial Management

Regeneron Pharmaceuticals

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Sep 12, 2026