On March 15, 2022, the Patent Trial and Appeal Board (PTAB) denied institution of post-grant review (PGR) proceedings initiated by Celltrion Inc. concerning Regeneron Pharmaceutical’s U.S. Patent No. 10,857,231 (the ’231 Patent) after Regeneron disclaimed the patent. The ’231 patent has claims directed to formulations of aflibercept, the active ingredient…