Testing the Combination of Venetoclax and Rituximab, in Comparison to the Usual Treatment (Ibrutinib and Rituximab) for Waldenstrom’s Macroglobulinemia/Lymphoplasmacytic Lymphoma

Description

PRIMARY OBJECTIVE:

I. To compare the rate of very good partial response or better (VGPR or better) in previously untreated participants with Waldenström’s macroglobulinemia (WM)/lymphoplasmacytic lymphoma (LPL) who are treated upfront with ibrutinib plus rituximab (IR) versus (vs.) venetoclax plus rituximab (VR) regimen.

SECONDARY OBJECTIVES:

I. To compare overall response rates (ORR) in WM participants treated upfront with IR vs. those treated with VR.

II. To compare progression-free survival (PFS), time to next treatment, duration of response in WM participants treated upfront with IR vs. those treated with VR.

III. To compare the rate of complete response (CR) in WM participants treated upfront with IR vs. those treated with VR.

IV. To evaluate the safety of the IR regimen as compared to VR regimen in participants with WM.

V. To evaluate the time to VGPR in WM participants treated upfront with IR and those treated with VR.

VI. To evaluate the ORR in participants who progress on treatment with IR and VR and are crossed over to the other respective arm.

VII. To compare overall survival (OS) in WM participants treated upfront with IR vs. those treated with VR.

BANKING OBJECTIVE:

I. To bank specimens for future correlative studies.

OUTLINE: Patients are randomized to 1 of 2 arms.

ARM I: Patients receive ibrutinib orally (PO) once daily (QD) on days 1-28 of cycles 1-24 and rituximab intravenously (IV) on days 1, 8, 15, and 22 of cycles 1 and 5. Treatment repeats every 28 days for up to 24 cycles in the absence of disease progression or unacceptable toxicity. Patients with progressive disease during Arm I may receive rituximab and venetoclax as in Arm II for up to an additional 24 cycles. Patients undergo computed tomography (CT) or positron emission tomography (PET)/CT and bone marrow biopsy and aspiration as well as blood sample collection during screening and on the trial.

ARM II: Patients receive venetoclax PO QD on days 1-28 of each cycle and rituximab IV on days 1, 8, 15, and 22 of cycles 1 and 5. Treatment repeats every 28 days for up to 24 cycles in the absence of disease progression or unacceptable toxicity. Patients with progressive disease during Arm II may receive ibrutinib and rituximab as in Arm I for up to an additional 24 cycles. Patients undergo CT or PET/CT and bone marrow biopsy and aspiration as well as blood sample collection during screening and on the trial.

After completion of study treatment, patients removed from protocol prior to progression are followed every 3 months until progression, death or 5 years after initial registration, whichever occurs first. Patients followed after progression of disease are followed every 6 months until death or 5 years after initial registration.