argenx(ARGX) - 2023 Q2 - Quarterly Report

Exhibit 99.1 argenx and Zai Lab Announce Approval of VYVGART® (efgartigimod alfa injection) for Generalized Myasthenia Gravis in China ● First-and-only approved FcRn antagonist for gMG patients by NMPA ● 68% of anti-AChR antibody positive gMG patients treated with VYVGART were responders (n=44/65) on the Myasthenia Gravis Activities of Daily Living (MG-ADL) scale compared with 30% of patients treated with placebo (n=19/64) (p<0.0001) during the first treatment cycle in the Phase 3 ADAPT trial ● Zai Lab to s ...