A Phase II Randomized Study Comparing BTK Inhibitors (Ibrutinib Plus Rituximab or Zanubrutinib Alone) vs. BCL-2 Inhibitor (Venetoclax) and Rituximab in Previously Untreated Waldenström's Macroglobulinemia (WM) / Lymphoplasmacytic Lymphoma (LPL)
National Cancer Institute (NCI)
Summary
This phase II trial studies the effects of venetoclax and rituximab in comparison to ibrutinib and rituximab or zanubrutinib in treating patients with previously untreated Waldenstrom's macroglobulinemia/lymphoplasmacytic lymphoma. Ibrutinib may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Rituximab is a monoclonal antibody. It binds to a protein called CD20, which is found on B cells (a type of white blood cell) and some types of cancer cells. This may help the immune system kill cancer cells. Venetoclax is in a class of medications called B-cell lymphoma-2 (BCL-2) inhibitors. It may stop the growth of cancer cells by blocking Bcl-2, a protein needed for cancer cell survival. Zanubrutinib, a type of tyrosine kinase inhibitor, blocks a protein called BTK, which may help keep cancer cells from growing. Giving venetoclax and rituximab may work better in treating patients with previously untreated Waldenstrom's macroglobulinemia than ibrutinib with rituximab or zanubrutinib alone.
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 + rituximab (IR) or zanubrutinib alone (Z) versus (vs.) venetoclax +/- rituximab (VR) regimen. SECONDARY OBJECTIVES: I. To compare overall response rates (ORR) in WM participants treated upfront with ibrutinib + rituximab or zanubrutinib alone vs. venetoclax + rituximab. II. To compare progression-free survival (PFS), time to next treatment, du…