Amgen buys ChemoCentryx for $3.7 billion, or $52 per share. ChemoCentryx developed the drug TAVNEOS to treat ANCA-associated vasculitis. Its U.S. sales in the first quarter of 2022, its first full quarter of sales, were $5.4 million. TAVNEOS is also already approved in major markets outside the U.S., including the European Union and Japan. The deal is scheduled to close in the fourth quarter of 2022.