AstraZeneca Soliris approved in Japan for paediatric patients with generalised myasthenia gravis

The approval by the Japanese Ministry of Health, Labour and Welfare (MHLW) was based on results from the Phase III trial of Soliris in paediatric patients with refractory gMG.

In the trial, Soliris demonstrated clinical benefit in paediatric patients with refractory gMG who previously failed immunosuppressive treatment and continued to experience significant unresolved disease symptoms. Soliris showed significant improvement in the primary endpoint of change from baseline in Quantitative Myasthenia Gravis (QMG) total score at week 26, a physician-reported scale assessing disease severity and function (-5.8 [95% CI -8.4, -3.13], p=0.0004).

gMG is a rare, debilitating, chronic, autoimmune neuromuscular disease that leads to a loss of muscle function and severe weakness.

Keiko Ishigaki, MD, PhD, Department of Pediatrics, Tokyo Women's Medical University, School of Medicine, Tokyo, Japan, said, “gMG is challenging to manage in paediatric patients, as current therapies available to this population, such as immunosuppressants, may not offer adequate control as the disease progresses. The expanded approval of Soliris in Japan demonstrates the impact of C5 complement inhibition in treating gMG, offering paediatric patients a targeted option with the potential to preserve muscle function and reduce disease severity.”

Marc Dunoyer, Chief Executive Officer, Alexion, said, “Paediatric patients living with gMG can become nonresponsive to standard treatments and continue to experience symptoms that impact their mobility, speech and breathing. Our first-in-class C5 inhibitor Soliris has the potential to improve outcomes and quality of life for paediatric patients and their families, and we take pride in delivering this first and only targeted therapy to the paediatric gMG community in Japan.”

The efficacy and safety of Soliris in paediatric patients is consistent with the established profile of Soliris in clinical trials involving adults with refractory gMG. In the Phase III clinical trial of paediatric patients, the majority of reported adverse events were considered mild or moderate. 

Soliris was first approved in Japan in 2017 for the treatment of certain adults with gMG and is also approved for certain adults with gMG in the US, China and the European Union (EU). Soliris was also recently approved in the EU for expanded use to include the treatment of refractory gMG in children and adolescents aged six to 17 years who are AChR Ab+. Regulatory submissions for Soliris for the treatment of paediatric patients with gMG are currently ongoing or planned with multiple health authorities.