Margetuximab: First Approval
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Updated: Sep 21, 2026

A Real-time Potency Assay for Chimeric Antigen Receptor T Cells Targeting Solid and Hematological Cancer Cells
Published on: November 12, 2019
1Springer Nature, Private Bag 65901, Mairangi Bay, Auckland, 0754, New Zealand. dru@adis.com.
Abstract:
The second-generation anti-human epidermal growth factor receptor2 protein (HER2) monoclonal antibody margetuximab (MARGENZA™, margetuximab-cmkb) is being developed for the treatment of HER2-positive breast cancer, gastric cancer and gastro-oesophageal junction cancer. The antibody has been engineered for increased binding to activating Fcγ receptor IIIA (CD16A) and decreased binding to inhibitory Fcγ receptor IIB (CD32B) relative to trastuzumab with the aim of improving response rates. Based on the results of the phase III SOPHIA trial margetuximab has been approved in the USA for use in combination with chemotherapy as treatment of previously-treated metastatic HER2-positive breast cancer. This article summarizes the milestones in the development of margetuximab leading to this first approval.
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