Pirtobrutinib and Mosunetuzumab for the Treatment of Relapsed/Refractory Grades 1-3A Follicular Lymphoma, PROMOTE-FL Trial

Recruiting now · Phase 2

Conditions studied: Grade 1 Follicular Lymphoma, Grade 2 Follicular Lymphoma, Grade 3a Follicular Lymphoma, Recurrent Follicular Lymphoma, Refractory Follicular Lymphoma

In brief

This phase II trial tests how well pirtobrutinib and mosunetuzumab work in treating patients with grade 1-3a follicular lymphoma (FL) that has come back after a period of improvement (relapsed) or that has not responded to previous treatment (refractory). Pirtobrutinib, a type of tyrosine kinase inhibitor, works by blocking the action of the Bruton tyrosine kinase (BTK) protein. The BTK protein signals cancer cells to multiply, and blocking it may help keep cancer cells from growing. It could also improve T cell fitness and decrease inflammation, therefore, may improve the efficacy and safety of T cell-based therapies, such as mosunetuzumab. Mosunetuzumab is a bispecific antibody that binds both T cells and the lymphoma cancer cells and harnesses T cells to interfere with the ability of cancer cells to grow and spread. Giving pirtobrutinib and mosunetuzumab together may kill more tumor cells in patients with relapsed or refractory grade 1-3a FL and potentially decreases some side effects of mosunetuzumab which are related to T cells being activated (e.g., cytokine release syndrome).

Key facts

Study ID

NCT06948786

Run by

University of Washington

People needed

22

Starts

2025-11-17

Expected to finish

2031-07-31

Last updated by the study team

2026-06-04

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Ability to understand, willing, and capable of signing a written informed consent document
• Age ≥ 18 years
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
• Histologically confirmed FL, grades 1-3a
• Relapsed after or failed to respond to at least two prior lines of systemic therapy and had received prior treatment with an anti-CD20-directed therapy
• Prior treatment-related adverse events (AEs) must have recovered to grade ≤ 1 with the exception of alopecia and grade 2 peripheral neuropathy
• At least one bi-dimensionally measurable lesion (≥ 1.5 cm in its largest dimension for nodal lesions, or ≥ 1.0 cm in its largest dimension for extranodal lesions within 6 weeks of screening by PET/CT scans with diagnostic computed tomography [CT] scan. PET/magnetic resonance imaging [MRI] scans may be allowed only if they are approved by the principal investigator [PI])
• Aspartate aminotransferase and alanine aminotransferase ≤ 3 x the upper limit of normal (ULN)
• Total bilirubin ≤ 1.5 x ULN; or total bilirubin ≤ 3 x ULN in patients with documented liver involvement or in patients with a documented history of Gilbert syndrome
• Platelet count ≥ 75 000/mm\^3 at any time during the screening window without requiring transfusion within 14 days prior to first dose of pirtobrutinib
• Absolute neutrophil count ≥ 1000/mm\^3 in the absence of growth factor support
• Total hemoglobin ≥ 10 g/dL at any time during the screening window without requiring transfusion within 21 days prior to first dose of pirtobrutinib
• Patients who did not meet criteria for hematologic function because of extensive marrow involvement of non-Hodgkin lymphoma, splenic sequestration, and/or disease-related cytopenia (e.g., immune thrombocytopenia) could be enrolled into the study if they have platelet count ≥ 50,000/mm\^3, absolute neutrophil count ≥ 750/mm\^3, and hemoglobin ≥ 7.5 g/dL after discussion with and confirmation by the PI
• Activated partial thromboplastin time (or partial thromboplastin time) and prothrombin (or international normalized ratio) ≤ 1.5 ULN
• Estimated creatinine clearance (CL) ≥ 30 mL/min by Cockcroft-Gault formula: (140 - age) x body weight (kg) x 0.85 (if female) serum creatinine (mg/dl) x 72 or other institutional standard methods (e.g., based on nuclear medicine renal scan)
• Negative serum pregnancy test at any time during the screening window for women of childbearing potential (WOCBP), defined as following: menarche and who are not postmenopausal (and 2 years of non-therapy-induced amenorrhea) or surgically sterile. Additionally, a negative serum pregnancy test is required within 3 days of initiating pirto
• Fertile male and WOCBP patients must be willing to use highly effective contraceptive methods from the initiation of study treatment, until at least 3 months after the last dose of mosun or at least one month after the last dose of pirto, whichever occurs last

You may not qualify if…

• Prior BTK inhibitor (BTKi) refractory disease defined as disease progression or recurrence during or within 6 months of prior BTKi therapy. If disease progression or recurrence occurs > 6 months after patients are off BTKi (e.g., due to intolerance), it is not considered as BTKi refractoriness. Patients with prior BTKi exposure but not meeting the criteria of BTKi refractoriness can be enrolled in this trial
• Prior exposure to pirtobrutinib
• CD3 T-cell engager exposed disease. However, these patients may be eligible if they stay in remission for at least 24 months after the last treatment with CD3 T-cell engager and have histologically confirmed CD20 expression on lymphoma at relapse or progression of disease
• Prior use of any monoclonal antibody, radioimmunoconjugate or antibody-drug conjugate within 4 weeks before first pirtobrutinib administration
• Prior treatment with systemic immunotherapeutic agents for which the mechanism of action involves T cells, including but not limited to cytokine therapy and anti-CTLA-4, anti-programmed death (PD)-1 and anti-PD-ligand 1 therapeutic antibodies, within 12 weeks or 5 half-lives of the drug, whichever was shorter, before first pirtobrutinib administration
• Treatment with any chemotherapeutic agent, or treatment with any other anti-cancer agent (investigational or otherwise) within 4 weeks or 5 half-lives of the drug, whichever was shorter, prior to first pirtobrutinib administration
• Treatment with radiotherapy within 2 weeks prior to the first pirtobrutinib administration. If patients received radiotherapy within 4 weeks prior to the first pirtobrutinib administration, patients must have had at least one measurable lesion outside of the radiation field. Patients who had only one measurable lesion that was previously irradiated but subsequently progressed are eligible
• History of allogeneic or autologous stem cell transplant (SCT) or chimeric antigen receptor-modified T cell (CAR-T) therapy within 60 days of enrollment or presence of any of the following, regardless of prior SCT and/or CAR-T therapy timing:
• Active graft versus host disease (GVHD);
• Cytopenia from incomplete blood cell count recovery post-transplant;
• Need for anti-cytokine therapy for toxicity from CAR-T therapy; residual symptoms of neurotoxicity > grade 1 from CAR-T therapy;
• Ongoing immunosuppressive therapy (> 20 mg prednisone or equivalent daily) or have been off immunosuppressive agents < 2 months
• Prior solid organ transplantation
• Patients who cannot swallow oral medications
• History of bleeding diathesis
• Patients who experienced a major bleeding event on prior treatment with a BTKi
• Clinically significant active malabsorption syndrome or other condition likely to affect gastrointestinal absorption of the study drug
• History of autoimmune disease, including but not limited to myocarditis, pneumonitis, myasthenia gravis, myositis, autoimmune hepatitis, systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, vascular thrombosis associated with antiphospholipid syndrome, Wegener's granulomatosis, Sjögren's syndrome, Guillain-Barré syndrome, multiple sclerosis, vasculitis, or glomerulonephritis
• Patients with history of macrophage activation syndrome/hemophagocytic lymphohistiocytosis (HLH)
• Patients with history of confirmed progressive multifocal leukoencephalopathy
• History of severe allergic or anaphylactic reactions to monoclonal antibody or BTKi therapy
• History of other malignancy except for the following: history of second malignancy unless in remission for at least 2 years; in-situ carcinomas not requiring treatment intervention, non-melanoma skin cancer curatively treated, nonmetastatic breast, or nonmetastatic prostate cancer where hormonal therapy is being continued as standard of care are allowed
• Current or past history of central nervous system (CNS) lymphoma
• Current or past history of CNS disease, such as stroke, epilepsy, CNS vasculitis, or neurodegenerative disease. Patients with a history of stroke who had not experienced a stroke or transient ischemic attack in the past 2 years and had no residual neurologic deficits as judged by the investigator were allowed. Patients with a history of epilepsy who had no seizures in the past 2 years while not receiving any anti- epileptic medications were allowed
• Significant cardiovascular disease defined as:

Where it is running

• Fred Hutch/University of Washington Cancer Consortium — Seattle, Washington, United States (enrolling)

Full record on ClinicalTrials.gov

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