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FDA issues CRL for Byondis’ BLA for trastuzumab duocarmazine

May 15, 2023

Byondis announced that the FDA has issued a complete response letter (CRL) for its Biological License Application (BLA) for [vic-]trastuzumab duocarmazine (SYD985).  Byondis sought approval for its anti-HER2 antibody-drug conjugate in HER2-positive unresectable locally advanced or metastatic breast cancer.  The CRL confirmed that the FDA has suspended its decision on SYD985’s approvability, requesting extra information.  Byondis said that it cannot respond to the request within the current evaluation period.