Phase 2 Study of Mosunetuzumab and Polatuzumab Vedotin as Consolidation After CD19 CAR T-Cell Therapy for Relapsed or Refractory Diffuse Large B-Cell and Grade 3B Follicular Lymphoma

What this Trial Is About

Researchers are evaluating whether the drugs mosunetuzumab and polatuzumab vedotin can provide benefits for patients with diffuse large B-cell lymphoma or grade 3b follicular lymphoma that has returned or not responded to treatment. This study focuses on patients who have already received chemotherapy with fludarabine and cyclophosphamide, followed by CAR T-cell therapy. The goal is to determine if adding these drugs after previous treatments may better control or shrink the cancer. Participants first receive lymphodepleting chemotherapy with fludarabine and cyclophosphamide, followed by one of three CAR T-cell therapies given by infusion tisagenlecleucel, axicabtagene ciloleucel, or lisocabtagene maraleucel. After this, participants are randomly assigned to one of four groups receiving mosunetuzumab alone, polatuzumab vedotin alone, both drugs together, or observation without further drug treatment. Those in the observation group who experience disease progression within 12 months may switch to receive both drugs. Throughout the study, patients undergo PET-CT or CT scans and provide blood and tissue samples for research. Participants will be monitored regularly with imaging scans and laboratory tests to assess disease status and treatment effects. Researchers will measure progression-free survival, overall survival, remission rates, and treatment side effects up to two years. The study also includes collecting and banking tissue samples and PET-CT images for future research. The total length of involvement depends on individual timelines but includes treatment and follow-up periods extending up to two years or more.

Testing Drug Treatments After CAR T-cell Therapy in Patients With Relapsed/Refractory Diffuse Large B-cell Lymphoma