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US biotechnology company Amgen (NASDAQ: AMGN) has announced that it has received market approval in China for its drug Tavneos (avacopan). The National Medical Products Administration (NMPA) has approved Tavneos for use as adjuvant therapy in adults with severe and active anti-neutrophil cytoplasmic antibody (ANCA) associated vasculitis, specifically granulomatous polyangitis…