Testing Treatments After CAR T-cell Therapy for Lymphoma
This study is testing if additional treatments, mosunetuzumab and/or polatuzumab vedotin, can help patients with diffuse large B-cell lymphoma (DLBCL), grade 3b follicular lymphoma, or primary mediastinal large B-cell lymphoma (PMBCL) after they have received CAR T-cell therapy. These lymphomas have either come back or did not respond to previous treatments. Mosunetuzumab is a monoclonal antibody, which is a type of targeted therapy that may stop cancer cells from growing. Polatuzumab vedotin combines a monoclonal antibody with a drug to deliver it directly to cancer cells. You may be eligible if you are 18 or older and have one of these types of lymphoma. The main goal is to see if these treatments can prevent the cancer from growing or spreading (progression-free survival) for up to two years.
- Study design
- This is an interventional study with a planned enrollment of 396 participants. It compares different consolidation therapies to no consolidation therapy.
- What's involved
- You would undergo blood and tissue sample collections, as well as PET-CT or CT scans. You would also receive intravenous (IV) infusions of axicabtagene ciloleucel, cyclophosphamide, and fludarabine.
- Compensation
- Not stated in the trial record.
- Follow-up
- Your progression-free survival will be assessed for up to two years after randomization.
AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.
NCT05633615
Testing Drug Treatments After CAR T-cell Therapy in Patients With Relapsed/Refractory Diffuse Large B-cell Lymphoma
Recruiting
PHASE2Ages 18+InterventionalTreatmentSWOG Cancer Research NetworkGovernment-funded
~396 participants
Updated 2026-02-02 on ClinicalTrials.gov
What's tested:Axicabtagene CiloleucelBiospecimen CollectionComputed TomographyCyclophosphamideFludarabineLisocabtagene Maraleucel
At a glance
Recruiting sites
83 of 87 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Progression free survival (PFS)
Measured over From date of randomization to date of first observation of progressive disease or death due to any cause, assessed up to 2 years
Conditions
NCT05633615
Where you'd take part
This study runs at 87 sites. They're the same protocol — you choose where, and that choice sets who your contact draft is addressed to.
Atrium Health Cabarrus/LCI-Concord
Concord, North Carolinastudy coordinator listed
Recruiting
Banner University Medical Center - Tucson
Tucson, Arizonastudy coordinator listed
Recruiting
Baptist Memorial Hospital and Cancer Center-Memphis
Memphis, Tennesseestudy coordinator listed
Recruiting
Beacon Kalamazoo Cancer Center
Kalamazoo, Michiganstudy coordinator listed
Recruiting
Bronson Battle Creek
Battle Creek, Michiganstudy coordinator listed
Recruiting
Bronson Methodist Hospital
Kalamazoo, Michiganstudy coordinator listed
Recruiting
Cancer and Hematology Centers of Western Michigan - Norton Shores
Norton Shores, Michiganstudy coordinator listed
Recruiting
Carolinas Medical Center/Levine Cancer Institute
Charlotte, North Carolinastudy coordinator listed
Recruiting
Sites open and close at different times, so the status above is per site — it can differ from the study's overall status.
Study leadership
- Brian T Hess · PRINCIPAL_INVESTIGATOR · SWOG Cancer Research Network
Who to contact
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Eligibility criteria
Inclusion
STEP 1: REGISTRATION: Participants must have a histologically confirmed diagnosis of diffuse large B-cell lymphoma or follicular lymphoma grade 3b or primary mediastinal large B-cell lymphoma (PMBCL)
STEP 1: REGISTRATION: Participants with transformed DLBCL must have transformed DLBCL from follicular or marginal zone lymphoma
STEP 1: REGISTRATION: Participant must have bi-dimensionally measurable systemic disease (at least one lesion with longest diameter \> 1.5 cm)
STEP 1: REGISTRATION: Participants with secondary central nervous system (CNS) lymphoma (parenchymal, spinal cord, meningeal, cerebrospinal fluid involvement) must be asymptomatic from their CNS disease
STEP 1: REGISTRATION: Participants must be registered for step 1 after they have signed institutional consent for CAR T-cell leukapheresis but prior to the start of lymphodepleting (LD) chemotherapy for commercial CAR T-cell product
STEP 1: REGISTRATION: In the opinion of the enrolling physician, participants must be felt to be a candidate for CAR T-cell therapy with plans to be treated with Food and Drug Administration (FDA) approved commercially available CD19 CAR T-cell construct.
Participants must qualify for commercially approved CD19 CAR T-cell therapy per FDA package insert.
If the CAR T-cell product does not meet parameters to be given as an FDA approved product (i.e. does not meet specification criteria mandated by FDA and is infused under an expanded access protocol \[EAP\] or single participant investigational new drug \[IND\]) the participant will be taken off of study and no longer be eligible for step 2 randomization
STEP 1: REGISTRATION: Participants are permitted to receive or have received 'bridging therapy' after CAR T-cell leukapheresis. However, participants must not receive polatuzumab vedotin, and/or mosunetuzumab as part of bridging therapy.
Bridging therapy is defined as lymphoma directed therapy administered between leukapheresis and the start of LD chemotherapy. This includes cytotoxic chemotherapy (e.g.: bendamustine and rituximab \[BR\], rituximab, gemcitabine and oxaliplatin \[R-gem/ox\]), radiation, corticosteroids, as well as novel therapies such as BTK inhibitors (e.g.: Ibrutinib), immunomodulators (e.g.: lenalidomide), monoclonal antibodies (e.g.: rituximab, obinutuzumab, tafasitamab) antibody drug conjugates (e.g: loncastuximab), checkpoint inhibitors (e.g.: pembrolizumab, nivolumab), clinical trial treatments, etc.
If a participant receives polatuzumab vedotin or mosunetuzumab as bridging they will ineligible to continue on step 1 registration portion of the study and be ineligible for step 2 randomization
STEP 1: REGISTRATION: PET-CT scan must be planned for completion within 60 days prior to the start of LD chemotherapy.
All pre-CAR T-cell therapy disease must be assessed and documented on the baseline/pre-registration tumor assessment form.
If receiving bridging therapy, participants must have a PET-CT scan upon completion of all planned bridging therapy. If the PET-CT scan after completion of bridging therapy is consistent with complete remission per Lugano criteria as determined by enrolling physician, that participant will be ineligible for step 2 randomization.
Participants are permitted to receive corticosteroids after leukapheresis without the need to repeat a PET-CT scan. If steroids are used, they must be planned to stop no later than 3 days before CAR -T cell infusion.
If response assessment by central review cannot be completed (I.e., poor quality of PET-CT scan, PET-CT performed out of window, etc.) this would be recorded as 'inadequate assessment' and patient would not be eligible for randomization
STEP 1: REGISTRATION: Participants that have previously been treated with polatuzumab vedotin or mosunetuzumab prior to CAR T-cell leukapheresis for either indolent or aggressive NHL are eligible as long as the participant did not have refractory disease or progression/relapse within 6 months of the last infusion with either agent
STEP 1: REGISTRATION: Participants must be planning to receive CAR T-cell infusion no earlier than 2 days and no later than 14 days after completion of the last day of lymphodepleting chemotherapy. Any participant receiving CAR T-cell infusion outside of this window will be ineligible for step 2 randomization
STEP 1: REGISTRATION: LD chemotherapy prior to CAR T-cell infusion must be planned to start within 60 days after step 1 registration
STEP 1: REGISTRATION: Participants must be \>= 18 years of age at the time of registration
STEP 1: REGISTRATION: Participants must have Zubrod performance score (PS) of 0, 1, or 2
STEP 1: REGISTRATION: Total bilirubin =\< 2 x institutional upper limit of normal (ULN) (within 14 days prior to registration)
Unless due to Gilbert's disease or lymphomatous involvement of liver
STEP 1: REGISTRATION: Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) =\< 3 x institutional ULN (within 14 days prior to registration)
STEP 1: REGISTRATION: Creatinine clearance \>= 40 mL/min, as estimated by the Cockcroft and Gault formula. The creatinine value used in the calculation must have been obtained within 14 days prior to registration. Estimated creatinine clearance is based on actual body weight
STEP 1: REGISTRATION: Participants must have an echocardiogram (ECHO) or multigated acquisition scan (MUGA) within 60 days prior to registration with a cardiac ejection fraction \>= 40%.
Participants with current symptoms of cardiac disease must have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, participants must be class 2B or better.
Participants must not have documented myocardial infarction and percutaneous coronary intervention (PCI) within 6 months prior to registration or myocardial infarction without PCI within 3 months of registration, or unstable angina
STEP 1: REGISTRATION: Participants with peripheral neuropathy must have \< grade 2
STEP 1: REGISTRATION: Participants with hepatitis B virus infection must have undetectable viral load within 14 days prior to registration, be on suppressive therapy and have no evidence of hepatitis B virus (HBV) related hepatic damage
STEP 1: REGISTRATION: Participants with hepatitis C infection must have eradication therapy completed, have no evidence of hepatitis C infection (HCV) related damage and have undetectable viral load within 14 days prior to registration
STEP 1: REGISTRATION: Participants with known human immunodeficiency virus (HIV)-infection must be on effective anti-retroviral therapy at time of registration and have undetectable viral load test on the most recent test results obtained within 6 months prior to registration
STEP 1: REGISTRATION: Participants must be offered the opportunity to participate in banking for planned translational medicine and future research. With participant consent, any residuals from the mandatory tissue submission will also be banked for future research.
Note: Streck tubes must be ordered in advance. Please allow 5-7 days for shipment of the collection kits
STEP 1: REGISTRATION: NOTE: As a part of the OPEN registration process the treating institution's identity is provided in order to ensure that the current (within 365 days) date of institutional review board approval for this study has been entered in the system.
Participants must be informed of the investigational nature of this study and must sign and give informed consent in accordance with institutional and federal guidelines.
For participants with impaired decision-making capabilities, legally authorized representatives may sign and give informed consent on behalf of study participants in accordance with applicable federal, local, and Central Institutional Review Board (CIRB) regulations
STEP 2: RANDOMIZATION: Participants must have met all eligibility criteria for step 1 registration
STEP 2: RANDOMIZATION: Participant's CAR T-cell product must have met specification parameters to be given as an FDA approved commercial product
STEP 2: RANDOMIZATION: Participants must have a PET-CT scan between days 25-40 after CAR T-cell infusion and determined to have a response consistent with stable disease or partial remission by central review compared to most recent pre-LD chemo/CAR T-cell PET-CT scan.
Note: Patients with delayed enrollment \> 21 days after 'day +30' PET-CT scan will necessitate a repeat PET-CT scan if concerning signs or symptoms of lymphoma progression develop.
Note: If response assessment by central review cannot be completed (I.e., poor quality of PET-CT scan, PET-CT performed out of window, etc.) this would be recorded as 'inadequate assessment' and patient would not be eligible for randomization
STEP 2: RANDOMIZATION: Eligible participants must be randomized no later than 60 days after CAR -T infusion
STEP 2: RANDOMIZATION: Participants must have started LD chemotherapy within 60 days of signing consent for step 1 registration
STEP 2: RANDOMIZATION: Participants must have S2114 CAR T-cell therapy form submitted to Southwest Oncology Group (SWOG) prior to step 2 randomization
STEP 2: RANDOMIZATION: Participants must have had a PET-CT scan upon completion of all planned bridging therapy if received, with the exception of up to 7 days of corticosteroids. If the PET-CT scan after completion of bridging therapy was consistent with complete remission per Lugano criteria as determined by enrolling physician, that participant will be ineligible for step 2 randomization.
If response assessment by central review cannot be completed (I.e., poor quality of PET-CT scan, PET-CT performed out of window, etc.) this would be recorded as 'inadequate assessment' and patient would not be eligible for randomization
STEP 2: RANDOMIZATION: Participants must have Zubrod PS of 0, 1, or 2
STEP 2: RANDOMIZATION: Absolute neutrophil count (ANC) \>= 1.0 x 10\^3/uL and participants must not have received myeloid growth factor within 72 hours prior to this lab being drawn (within 7 days prior to step 2 randomization)
STEP 2: RANDOMIZATION: Platelets \>= 75 x 10\^3/uL and participants must not have received platelet transfusion within 72 hours prior to this lab being drawn (within 7 days prior to step 2 randomization)
STEP 2: RANDOMIZATION: Total bilirubin =\< 2 x institutional ULN (within 7 days prior to step 2 randomization)
Unless due to Gilbert's disease or lymphomatous involvement of liver
STEP 2: RANDOMIZATION: AST and ALT =\< 3 x institutional ULN (within 7 days prior to step 2 randomization)
STEP 2: RANDOMIZATION: Creatinine clearance \>= 40 mL/min, as estimated by the Cockcroft and Gault formula. The creatinine value used in the calculation must have been obtained within 7 days prior to step 2 randomization. Estimated creatinine clearance is based on actual body weight (within 7 days prior to step 2 randomization)
STEP 2: RANDOMIZATION: Participants with peripheral neuropathy must have \< grade 2
STEP 2: RANDOMIZATION: Participants with current symptoms of cardiac disease must have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, participants must be class 2B or better
STEP 2: RANDOMIZATION: Participants with history of hepatitis B viral infection must have undetectable viral load within 14 days prior to step 2 randomization and on suppressive therapy
STEP 2: RANDOMIZATION: Participants with history of hepatitis C viral infection must have undetectable viral load within 14 days prior to step 2 randomization
STEP 2: RANDOMIZATION: Participants with known human immunodeficiency virus (HIV)-infection must be continuing to receive anti-retroviral therapy and have an undetectable viral load test within 14 days prior to step 2 randomization
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants must have documented disease progression while on Arm 4 (observation) on this protocol. The follow-up tumor assessment form documenting disease progression must be submitted to SWOG prior to step 3 crossover registration
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants must be registered within 28 days of the date of progression
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants must have imaging that clearly demonstrates progression compared to day +30 PET-CT scan
Note: These scans should be performed as standard of care and only performed between scheduled response assessments required for study if symptoms arise that are concerning for progression
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants must have Zubrod PS of 0, 1, or 2
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): ANC \>= 1.0 x 10\^3/uL and participants must not have received myeloid growth factor within 72 hours prior to this lab being drawn (within 14 days prior to step 3 crossover registration)
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Platelets \>= 75 x 10\^3/uL and participants must not have received platelet transfusion within 72 hours prior to this lab being drawn (within 14 days prior to step 3 crossover registration)
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Total bilirubin =\< 2 x institutional ULN (within 14 days prior to step 3 crossover registration)
Unless due to Gilbert's disease or lymphomatous involvement of liver
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): AST and ALT =\< 3 x institutional ULN
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Creatinine clearance \>= 40 mL/min, as estimated by the Cockcroft and Gault formula. The creatinine value used in the calculation must have been obtained within days prior to step 3 crossover registration. Estimated creatinine clearance is based on actual body weight (within 14 days prior to step 3 crossover registration)
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants with peripheral neuropathy must have \< grade 2
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants with current symptoms of cardiac disease must have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, participants must be class 2B or better
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants with history of hepatitis B viral infection must have undetectable viral load within 14 days prior to step 3 crossover registration and on suppressive therapy
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants with history of hepatitis C viral infection must have undetectable viral load within 14 days prior to step 3 crossover registration
STEP 3: CROSSOVER REGISTRATION (ARM 4 ONLY): Participants with known human immunodefici
What this trial measures
- Progression free survival (PFS)From date of randomization to date of first observation of progressive disease or death due to any cause, assessed up to 2 years
Will compare PFS in participants with relapsed/refractory large B-cell lymphoma or follicular lymphoma grade 3B with stable disease (SD) or partial remission (PR) on first imaging response (day +30 positron emission tomography \[PET\]/computed tomography \[CT\] scan) after commercial CD19 chimeric antigen receptor (CAR) T-cell therapy who are randomized to receive each consolidation therapy versus those that receive no consolidation therapy (i.e. control). Specifically, will compare the PFS of 1) mosunetuzumab consolidation to no consolidation, 2) polatuzumab vedotin consolidation to no consolidation, 3) mosunetuzumab + polatuzumab vedotin to no consolidation. Will analyze results by arm rather than assuming no-interactions in some factorial analyses. Will follow multi-step hypothesis testing procedure of Freidlin and Korn to compare the arms within this randomized Phase II study. Each of the primary comparisons has 81% power using a stratified logrank test at one-sided alpha of 0.05.