The biosimilars space offers significant commercial opportunity. About US$60 billion of branded biologic sales will lose patent protection over the next few years, including some of the largest-selling monoclonal antibodies (MAbs). Companies are jostling among themselves, each seeking the best position to exploit that opportunity. Regulators are creating and refining the necessary pathways to success, alliances are being forged, and companies are being acquired. Despite the significant opportunity for biosimilar MAbs, significant risks remain. Perhaps the most significant of those…