Argenx’s VYVGART Hytrulo Receives FDA Priority Review for Chronic Inflammatory Demyelinating Polyneuropathy

argenx SE (Euronext & Nasdaq: ARGX), a global immunology company dedicated to enhancing the well-being of individuals with severe autoimmune conditions, has announced today that the U.S. Food and Drug Administration (FDA) has accepted a supplemental Biologics License Application (sBLA) for priority review concerning VYVGART Hytrulo (efgartigimod alfa and hyaluronidase-qvfc) for treating chronic inflammatory demyelinating polyneuropathy (CIDP). The application is slated for a PDUFA target action date of June 21, 2024.

Luc Truyen, Chief Medical Officer of argenx, expressed, “Today’s announcement brings us one step closer to delivering the transformative innovation of VYVGART Hytrulo to CIDP patients. CIDP is yet another example of an autoimmune disease that has not been well understood, and for which there has been insufficient innovation for patients. We chose to use a priority review voucher to accelerate review of our submission because CIDP patients have long been waiting for new treatment options. FDA’s acceptance of the sBLA represents an important milestone in our continued drive to bring novel treatments for rare, autoimmune diseases, and a significant step forward for people whose lives have been profoundly impacted by this devastating disease.”

The sBLA is supported by data from the ADHERE study, the largest clinical trial of CIDP to date, assessing the safety and efficacy of subcutaneously administered VYVGART Hytrulo in adults with CIDP. The study achieved its primary endpoint (p=0.000039), demonstrating a 61% lower risk of relapse (HR: 0.39 95% CI: 0.25; 0.61) with VYVGART Hytrulo compared to placebo. In the open-label Stage A of the study, 67% of patients showed evidence of clinical improvement (ECI) following treatment with VYVGART Hytrulo. The clinical results established that IgG autoantibodies play a significant role in the underlying biology of CIDP, given VYVGART Hytrulo’s mechanism of action as an FcRn blocker.

VYVGART Hytrulo exhibited a well-tolerated safety profile consistent with prior clinical trials and the known profile of VYVGART®. After completing ADHERE, 99% of eligible patients (226/228) continued to the ADHERE-+ open-label extension study.

Chronic inflammatory demyelinating polyneuropathy (CIDP) is a rare and serious autoimmune disease of the peripheral nervous system. Although confirmation of disease pathophysiology is still emerging, there is increasing evidence that IgG antibodies play a key role in the damage to the peripheral nerves. People with CIDP experience fatigue, muscle weakness and a loss of feeling in their arms and legs that can get worse over time or may come and go. These symptoms can significantly impair a person’s ability to function in their daily lives. Without treatment, one-third of people living with CIDP will need a wheelchair.

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