Immunex Corp v. Sandoz Inc., No. 20-1037 (Fed. Cir. 2020)Annotate this Case
The patents at issue are directed to the fusion protein etanercept and methods of making the same. Etanercept is the active ingredient in Immunex’s biologic drug Enbrel®, which is primarily indicated for reducing the signs and symptoms of moderately to severely active rheumatoid arthritis, an autoimmune disorder. Sandoz filed an abbreviated Biologics License Application (aBLA), seeking approval to market Erelzi, a biosimilar version of Enbrel®. In a patent infringement suit under the Biologics Price Competition and Innovation Act, Sandoz stipulated to infringement of the asserted claims of the patents-in-suit. The district court held that Sandoz had failed to prove that the asserted claims of the patents-in-suit were invalid. The Federal Circuit affirmed, rejecting claims of obviousness-type double patenting; failure to meet the written description requirement; and obviousness.