Mosunetuzumab and Polatuzumab Vedotin Demonstrates Preliminary Efficacy in Elderly Unfit/Frail Patients with Previously Untreated Diffuse Large B-Cell Lymphoma

Background: Treatment options for elderly unfit/frail (U/F) patients (pts) with diffuse large B-cell lymphoma (DLBCL) are often limited due to comorbidities or functional decline. Less toxic, efficacious alternatives to full-dose chemoimmunotherapy (CIT) are needed. Mosunetuzumab (Mosun) is a first-in-class CD20xCD3 T-cell engaging bispecific antibody that redirects T cells to eliminate B cells. Mosun monotherapy has demonstrated efficacy, durable complete responses (CR), and manageable safety in U/F pts with untreated DLBCL (NCT03677154; Olszewski et al. ASH 2022). Subgroup analysis from an ongoing Phase Ib/II study (NCT03671018) of Mosun plus polatuzumab vedotin (Pola; M-Pola) in pts with relapsed/refractory DLBCL demonstrated efficacy and a manageable safety profile in pts ≥65 years (yrs) (Olszewski et al. ASH 2022). We report preliminary efficacy and safety data from the M-Pola cohort of study NCT03677154 in elderly U/F pts with newly diagnosed DLBCL.