NCT07003295

Testing the Anti-cancer Drug, Glofitamab, in Patients With Mantle Cell Lymphoma (A Type of Blood Cancer) Whose Disease Returned After CAR-T Cell Therapy

A Phase II Study of Glofitamab for Relapsed/Refractory Mantle Cell Lymphoma in Patients Previously Treated With CD19-Directed CAR T-Cell Therapy

• Status: Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 20 (estimated)
• Sponsor: National Cancer Institute (NCI) · NIH
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

This phase II trial tests the safety and side effects of glofitamab and obinutuzumab and how well they work in treating patients with mantle cell lymphoma that has come back after a period of improvement (relapsed) or that has not responded to previous treatment (refractory) after receiving CD19-directed chimeric antigen receptor (CAR) T-cell therapy. CAR T-cell therapy is a form of immunotherapy where the immune system cell, T-cell, is changed to attack cancer cells. Glofitamab is a bispecific antibody that can bind to two different antigens at the same time. Glofitamab binds to CD3, a protein found on T cells (a type of white blood cell), and CD20 a protein found on B cells (another type of white blood cell) and some lymphoma cells. This may help the immune system kill cancer cells. Obinutuzumab is a monoclonal antibody that may interfere with the ability of cancer cells to grow and spread. A monoclonal antibody is a type of protein that can bind to certain targets in the body, such as molecules that cause the body to make an immune response (antigens). Giving glofitamab and obinutuzumab may be safe, tolerable, and/or effective in treating patients with relapsed or refractory mantle cell lymphoma after receiving CD19-directed CAR T-cell therapy.

Detailed description

PRIMARY OBJECTIVE: I. To determine the proportion of relapsed/refractory (R/R) mantle cell lymphoma (MCL) patients with an objective response (OR) to glofitamab after prior treatment with chimeric antigen receptor (CAR)-T. SECONDARY OBJECTIVES: I. To describe the proportion of patients with a complete response (CR). II. To describe the progression-free survival (PFS) and overall survival (OS) at 24 months. III. To describe the incidence of grade 3-4 cytokine release syndrome (CRS). IV. To describe the incidence of grade 3-4 neurologic toxicity. V. To describe the relationship between glofitamab clearance at baseline, changes in clearance over time, treatment response, and duration of response. EXPLORATORY OBJECTIVES: I. To evaluate the relationship between circulating tumor deoxyribonucleic acid (DNA) (ctDNA) detection in plasma, treatment response, and duration of response. II. To evaluate the relationship between CAR T-cell levels in plasma, immunophenotype, treatment response, and duration of response. III. To evaluate the relationship between fluorodeoxyglucose positron emission tomography/ computed tomography (FDG PET/CT) interlesional treatment response heterogeneity and survival outcomes. IV. To evaluate the relationship between organ-specific changes in standardized uptake value (SUV) metrics and immune-related adverse events (AEs). OUTLINE: Patients receive obinutuzumab intravenously (IV) on day 1 or on days 1 and 2 of cycle 1 and glofitamab IV over 8 hours on days 8 and 15 of cycle 1 then over 2-8 hours on day 1 of cycles 2-12. Cycles repeat every 21 days for up to 12 cycles in the absence of disease progression or unacceptable toxicity. Additionally, patients undergo blood sample collection and PET/CT throughout the study. After completion of study treatment, patients are followed every 3 months for up to 2 years.

Conditions

• Recurrent Mantle Cell Lymphoma
• Refractory Mantle Cell Lymphoma

Interventions

Type	Name	Description
PROCEDURE	Biospecimen Collection	Undergo blood sample collection
PROCEDURE	Computed Tomography	Undergo PET/CT
BIOLOGICAL	Glofitamab	Given IV
BIOLOGICAL	Obinutuzumab	Given IV
PROCEDURE	Positron Emission Tomography	Undergo PET/CT

Timeline

• Start date: 2026-08-14
• Primary completion: 2027-08-31
• Completion: 2027-08-31
• First posted: 2025-06-04
• Last updated: 2026-04-16

Locations

5 sites across 1 country: United States

Regulatory

• FDA-regulated drug study