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Can Coherus invalidate Amgen’s Enbrel® patents?

Amgen’s Enbrel® blockbuster faces encroaching biosimilar competition from Sandoz and Coherus Biosciences.  Coherus Biosciences has filed petitions for inter partes review against Amgen’s two protein patents covering Enbrel®, the ‘182 patent and the ‘522 patent.  The institution decisions are due before the trial:  March 15, 2018 for the ‘182 IPR, and March 13, 2018 for the ‘522 IPR.  If the IPRs are instituted, that could shift the dynamics, and push the parties to agree on an entry date.  What are Coherus's invalidity arguments?

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