Seribantumab (INN; development code MM-121) is a monoclonal antibody designed for the treatment of cancer.Statement On A Nonproprietary Name Adopted By The USAN Council - Seribantumab, American Medical Association. It binds to extracellular domain of HER3 blocking NRG1 binding and thereby preventing the activation of the receptor.

This drug was developed by Sanofi/Merrimack Pharmaceuticals, Inc.

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