Objective:

To expand the indication for efgartigimod alfa-fcab and efgartigimod alfa with hyaluronidase-qvfc to all adult patients with generalized myasthenia gravis (gMG), including those who are anti-AChR, anti-MuSK, anti-LRP4 positive, and triple seronegative.

Key Findings:

• Efgartigimod treatment resulted in a statistically significant improvement in Myasthenia Gravis Activities of Daily Living (MG-ADL) scores compared to placebo at week 4.
• The treatment group achieved a mean 3.35-point improvement from baseline in MG-ADL total score.
• Improvements in MG-ADL and Quantitative Myasthenia Gravis scores were observed across various antibody-positive and triple-seronegative subgroups, highlighting the treatment's effectiveness across diverse patient populations.

Interpretation:

The expansion of the indication for efgartigimod provides a treatment option for a broader range of gMG patients, including those who are triple seronegative, who have historically been underrepresented in clinical studies.

Limitations:

• The study primarily focused on a specific population and may not fully represent all gMG patients, particularly those with different antibody profiles.
• Common side effects were reported, which may affect patient adherence and treatment outcomes.

Conclusion:

Efgartigimod is well tolerated and shows promise in improving symptoms of gMG across diverse patient populations, including those without detectable antibodies, thus addressing a significant unmet need.