VYVDURA® now approved for at-home self-injection in Japan for both generalized myasthenia gravis and CIDP

argenx's VYVGART® and VYVDURA portfolio approved in Japan for three indications – first country globally with access across three indications

argenx SE (Euronext & Nasdaq: ARGX), a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases, today announced that Japan’s Ministry of Health, Labour and Welfare (MHLW) approved VYVDURA for adults with chronic inflammatory demyelinating polyneuropathy (CIDP). VYVDURA is approved for CIDP as a once weekly 30-to-90 second subcutaneous injection, which can be self-administered at home, and is the first and only neonatal Fc receptor (FcRn) blocker approved for the treatment of CIDP.

“CIDP is a rare and debilitating disease for which there has been little innovation in treatment in 30 years,” said Luc Truyen, M.D., Ph.D., Chief Medical Officer of argenx. “With VYVDURA, CIDP patients in Japan now have access to a novel therapy with a focused mode of action offering a convenient 30-to-90 second at-home self-injection option with an established efficacy and safety profile, as demonstrated by the ADHERE trial and real-world evidence. By extending the reach of this transformational therapy to thousands more patients, argenx continues to bring efgartigimod, our first-in-class FcRn blocker, to more patients in Japan and around the world suffering from severe autoimmune disease.”

CIDP is a progressive, immune-mediated rare and debilitating neuromuscular disorder of the peripheral nervous system. Patients experience a range of disabling mobility and sensory issues, including trouble standing from a seated position, pain and fatigue, and frequent tripping or falling. Many patients become wheelchair bound and are unable to work as the disease progresses. Currently, 85% of patients require ongoing treatment and nearly 88% of treated patients experience residual impairment and disability.

The MHLW approval is based on the ADHERE Study, the largest clinical trial to date studying CIDP. In the ADHERE study, 69% (221/322) of patients treated with VYVDURA, regardless of prior treatment, demonstrated evidence of clinical improvement, including improvements in mobility, function and strength. ADHERE met its primary endpoint (p<0.0001) demonstrating a 61% reduction (HR: 0.39 95% CI: 0.25; 0.61) in the risk of relapse versus placebo. Ninety-nine percent of trial participants elected to participate in the ADHERE+ open-label extension. The safety results were generally consistent with the known safety profile of VYVDURA in previous clinical studies and real-world use.

VYVDURA was approved by the MHLW for manufacturing and marketing in January 2024 and launched in April 2024 for the treatment of generalized myasthenia gravis (gMG). In March 2024, VYVDURA was designated as an Orphan Drug for the treatment of CIDP by the MHLW.