Gilead Sciences lost yet another challenge to the company’s U.S. patent to Truvada for HIV prevention, or PrEP.

Biogen successfully fended off a patent challenge from generic company Mylan over the multiple sclerosis (MS) drug Tecfidera.

Alexion Pharmaceuticals Inc. agreed to buy smaller biotech company Achillion Pharmaceuticals Inc. in a deal initially valued at $930 million.

A U.S. judge upheld two patents relating to Amgen Inc.’s blockbuster rheumatoid arthritis drug Enbrel, denying a challenge by Novartis AG, which is seeking to launch a copycat version.

The U.S. patent office rejected a filing by Alvogen Pine Brook for a review challenging patents on Celgene’s blockbuster myeloma drug Revlimid.

Amgen Inc. said a U.S. jury confirmed the validity of patents on the biotech company’s cholesterol drug Repatha, rejecting a challenge by Regeneron Pharmaceuticals Inc. and Sanofi SA.