Pharmaceutical Japan's second largest drug company, Astellas (TYO: 4503), yesterday revealed that it will sell its patent estate relating to diabetes treatments, a non-core business for the firm, to US investment fund Royalty Pharma, for $609 million, thus shedding a non-core asset acquired with its hard fought for $4 billion takeover last year of USA-based OSI Pharmaceuticals (The Pharma Letter May 17, 2010). 1 July 2011