Fixed-duration subcutaneous (SC) mosunetuzumab, with maintenance therapy, in patients (pts) with previously untreated high-tumor burden follicular lymphoma (HTB FL): Longer follow-up and exploratory circulating tumor (ct)DNA analysis of the Phase II MorningSun study

作者：John M. Burke, Jeff P. Sharman, Bertrand Anz, Richard Zuniga, Aung M. Tun, David Wright, Prachi Jani, Juliana M.L. Biondo, Mei Wu, Yong Mun, Vivek S. Chopra, Rona Farighi, José C. Villasboas, Elizabeth Budde, Ian W. Flinn · 发表于：Blood · 年份：2025 · DOI：10.1182/blood-2025-228 · 被引用次数：2 · 研究领域：HER2/EGFR in Cancer Research、Lymphoma Diagnosis and Treatment、Monoclonal and Polyclonal Antibodies Research

Abstract Background: Mosunetuzumab, a CD20xCD3 bispecific antibody, can be administered in the outpatient setting for a fixed duration. Mosunetuzumab by intravenous (IV) administration is FDA- and EMA-approved in relapsed/refractory (R/R) FL after ≥2 prior lines of therapy. Interim results from the Phase II MorningSun study (NCT05207670) demonstrated promising efficacy and manageable safety of mosunetuzumab SC in pts with previously untreated HTB FL (Flinn et al. ASCO 2025). We report 12-month follow-up efficacy and safety data of mosunetuzumab SC in pts with previously untreated HTB FL in the MorningSun study, including pts who received optional maintenance therapy. Methods: Pts with previously untreated HTB FL, per Groupe D'Etude des Lymphomes Folliculaires criteria, and Eastern Cooperative Oncology Group performance status of 0–2 were enrolled, primarily from United States (US) community sites. Mosunetuzumab SC was administered as step-up dosing in Cycle (C)1 (Day [D]1, 5mg; D8, 45mg; D15, 45mg) followed by 45mg on D1 of each 21-day cycle, for up to 17 cycles (1 year). Pts with a partial or complete metabolic response (CMR) after C17 could receive optional mosunetuzumab maintenance treatment (45mg every 8 weeks for up to 1 year). The primary endpoint was progression-free survival (PFS) rate at 1 year. Key secondary endpoints included objective response rate (ORR), duration of response (DOR), duration of complete response (DOCR) and safety. Exploratory analysis of ctDNA lev...