argenx focused on creating and developing differentiated therapeutic antibodies for the treatment of cancer and severe autoimmune diseases announced the initiation of a Phase II proof-of- concept study of ARGX-113 in patients with myasthenia gravis (MG). The double-blind, placebo controlled Phase II study will enrol up to 24 MG patients with confirmed generalized muscle weakness. ARGX-113 will be dosed on top of current standard of care, corticosteroids and/or immunomodulatory agents. The primary endpoints of the trial are safety and tolerability and secondary endpoints include efficacy, impact on quality of life and an assessment of pharmacokinetics (PK) and pharmacodynamic (PD) markers. In Phase I clinical trials, ARGX-113 demonstrated favorable safety and tolerability across multiple doses and dosing regimens with promising pharmacodynamics effects relating to speed, depth and duration of IgG reduction. ARGX-113 is a potential breakthrough therapy for treatment of IgG-mediated autoimmune diseases. ARGX-113 is the Fc-portion of an antibody that has been modified by the argenx proprietary ABDEG(TM) technology to increase its affinity for FcRn beyond that of normal IgG antibodies. As a result, ARGX-113 blocks antibody recycling and leads to fast depletion of the autoimmune disease-causing IgG autoantibodies. The development work on ARGX-113 is done in close collaboration with Prof. E. Sally Ward (University of Texas Southwestern Medical and Texas A&M University Health Science Center, a part of Texas A&M University ("TAMHSC")).