Mosunetuzumab With or Without Polatuzumab Vedotin and Obinutuzumab for the Treatment of Untreated Indolent B-Cell Non-Hodgkin Lymphoma

This phase II trial tests the effects of mosunetuzumab with or without polatuzumab vedotin and obinutuzumab for the treatment of patients with indolent B-cell non-Hodgkin lymphoma. Mosunetuzumab and obinutuzumab are monoclonal antibodies that may interfere with the ability of cancer cells to grow and spread. Polatuzumab vedotin is a monoclonal antibody, called polatuzumab, linked to a chemotherapy drug, called vedotin. Polatuzumab is a form of targeted therapy because it attaches to specific molecules (receptors) on the surface of cancer cells, known as CD79b receptors, and delivers vedotin to kill them. Giving mosunetuzumab with polatuzumab vedotin and obinutuzumab may work better in treating patients with untreated indolent B-cell non-Hodgkin lymphoma.