Commercial development of therapeutic monoclonal antibodies (MAbs) began in the early 1980s, and by 1986 the first MAb product had been approved in the United States: muromonab-CD3 (trade name Orthoclone OKT3, marketed by Janssen-Cilag) for prevention of kidney-transplant rejection. Since its approval, therapeutic MAbs and antibody-related products such as Fc-fusion proteins, antibody fragments, and antibody–drug conjugates (collectively referred to herein as “MAb products”) have grown to become the dominant product class within the biopharmaceutical market. They have been approved for…