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Single-Agent Mosunetuzumab Shows Durable Complete Responses in Patients With Relapsed or Refractory B-Cell Lymphomas: Phase I Dose-Escalation Study

Open access
Budde, Lihua E., Assouline, Sarit, Sehn, Laurie H., Schuster, Stephen J., Yoon, Sung-Soo, Yoon, Dok Hyun, Matasar, Matthew J., Bosch, Francesc, Kim, Won Seog, Nastoupil, Loretta J., Flinn, Ian W., Shadman, Mazyar, Diefenbach, Catherine, O'Hear, Carol, Huang, Huang, Kwan, Antonia, Li, Chi-Chung, Piccione, Emily C., Wei, Michael C., Yin, Shen, Bartlett, Nancy L.·2022·Journal of Clinical Oncology

Abstract

PURPOSE: Mosunetuzumab is a bispecific antibody targeting CD20 and CD3 that redirects T cells to engage and eliminate malignant B cells and is being developed for relapsed or refractory (R/R) B-cell non-Hodgkin lymphomas (B-NHLs). METHODS: This first-in-human trial (ClinicalTrials.gov identifier: NCT02500407 ) evaluated the safety and tolerability and efficacy of mosunetuzumab in patients with R/R B-NHL and established the recommended phase II dose. Data from dose escalation are presented. Single-agent mosunetuzumab was administered intravenously in 3-week cycles, at full dose in cycle 1 day 1 (group A) or with ascending (step-up) doses during cycle 1 on days 1, 8, and 15 (group B), for eight or 17 cycles on the basis of tumor response. RESULTS: Two hundred thirty patients were enrolled. Doses up to 2.8 mg and 60 mg were assessed in groups A and B, respectively; maximum tolerated dose was not exceeded. In group B (n = 197), common adverse events (≥ 20% of patients) were neutropenia (28.4%), cytokine release syndrome (27.4%), hypophosphatemia (23.4%), fatigue (22.8%), and diarrhea (21.8%). Cytokine release syndrome was mostly low-grade (grade ≥ 3: 1.0%) and mainly confined to cycle 1. Across the doses investigated (group B), best overall response rates were 34.9% and 66.2% in patients with aggressive and indolent B-NHL, respectively, and complete response rates were 19.4% and 48.5%. Among patients with a complete response, the median duration of response was 22.8 months (95% CI, 7.6 to not estimable) and 20.4 (95% CI, 16 to not estimable) in patients with aggressive and indolent B-NHL, respectively. CONCLUSION: Mosunetuzumab, administered with step-up dosing, has a manageable safety profile and induces durable complete responses in R/R B-NHL. The expansion stage of the study is ongoing at the dose level of 1/2/60/60/30 mg selected for further study.

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Metadata

Authors
Budde, L. E., Assouline, S., Sehn, L. H., Schuster, S. J., Yoon, S.-S., Yoon, D. H., Matasar, M. J., Bosch, F., Kim, W. S., Nastoupil, L. J., Flinn, I. W., Shadman, M., Diefenbach, C., O'Hear, C., Huang, H., Kwan, A., Li, C.-C., Piccione, E. C., Wei, M. C., Yin, S., & Bartlett, N. L.
Venue
Journal of Clinical Oncology
Published
2022-02-10
Volume
40
Issue
5
Pages
481-491
ISSN
  • 0732-183X (ISSN-L)
  • 1527-7755
OpenAlex
W4200255107
Cited by
302
References
6
FWCI
30.95
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Single-Agent Mosunetuzumab Shows Durable Complete Responses in Patients With Relapsed or Refractory B-Cell Lymphomas: Phase I Dose-Escalation Study. https://app.cochat.ai/papers/10.1200/jco.21.00931
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Budde, L. E., Assouline, S., Sehn, L. H., Schuster, S. J., Yoon, S.-S., Yoon, D. H., Matasar, M. J., Bosch, F., Kim, W. S., Nastoupil, L. J., Flinn, I. W., Shadman, M., Diefenbach, C., O'Hear, C., Huang, H., Kwan, A., Li, C.-C., Piccione, E. C., Wei, M. C., . . . Bartlett, N. L. (2022). Single-Agent Mosunetuzumab Shows Durable Complete Responses in Patients With Relapsed or Refractory B-Cell Lymphomas: Phase I Dose-Escalation Study. Journal of Clinical Oncology. https://doi.org/10.1200/jco.21.00931

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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.