Amgen has entered into a definitive agreement with GSK to reacquire all of its remaining rights to Prolia® (denosumab), XGEVA® (denosumab) and Vectibix® (panitumumab) in 48 countries in Asia, South America, Europe, Australia and other regions throughout the world. The agreement involves key expansion markets for Amgen including Brazil, China, Colombia, Hong Kong, Israel, Singapore, South Korea, Taiwan and Thailand.