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Celltrion fourth IPR for Regeneron (aflibercept) patent

Feb 28, 2023

Celltrion filed an application for inter-partes review (IPR) against a fourth Regeneron US patent 10,406,226 relating to a method of making a VEGF antagonist fusion protein, including the fusion protein aflibercept supplied by Regeneron as Eylea®.    

Celltrion previously filed IPRs against Regeneron’s method of treatment patents 10,888,601 and 10,130,681 patents on 10 February 2023, as did Viatris (Mylan) on 11 January 2023 and Samsung Bioepis on 10 February 2023 and 6 January 2023 respectively.  Last month Celltrion and Samsung Bioepis separately sought joinder of their challenges to Regeneron’s ’601 and ’681 patents with Viatris’ IPR against the ‘601 and ‘681 patents, which were instituted in January 2023 

The Regeneron suit against Mylan in West Virginia, filed in August 2022, includes each of the ‘601, ‘681 and ‘226 patents.  The ‘601 patent is one of the six patents chosen by Regeneron to be determined at a 10 day trial in June 2023, 10 months after Regeneron filed its complaint.