Amgen, Inc. (AMGN): Amgen: GSK's Promacta Stealing Nplate's Thunder Seeking Alpha OB) Rituxan (Rituximab). If symptoms persist, surgical removal of the spleen, splenectomy, might be required. Amgen's Nplate (romiplostim) and GlaxoSmithKline's (GSK) Promacta (Eltrombopag) are two recently approved medications from a new class of ... |