VYVGART for IV infusion was evaluated in a global study of adults with anti-AChR antibody positive gMG.
The study examined the effectiveness and safety of VYVGART for IV infusion in 167 adults (18 years or older) with gMG. In addition to their current gMG treatment, patients received either VYVGART for IV infusion or placebo.
Patients in this study needed to meet the following criteria:
- Adult (18 or older)
- Myasthenia Gravis Foundation of America (MGFA) clinical classification class II to IV
- MG-ADL score of 5 or more
- On a stable dose of their current gMG treatment throughout the study
Patients represented a range of adults with gMG:
- Median time since gMG diagnosis was 9 years
- MGFA class ranged from II to IV at the start of the study
The MG-ADL scale was used to measure gMG symptoms:
- The MG-ADL scale assesses the impact of gMG on daily functions by measuring 8 signs or symptoms that are commonly affected in gMG: the ability to speak, chew, swallow, breathe, brush teeth or comb hair, and get out of a chair, as well as the frequency of double vision and eyelid droop
- Each item is measured on a 4-point scale, where a score of 0 represents normal function and a score of 3 represents the loss of ability to perform that function. Total scores range from 0 to 24 points, with a higher score showing more severe gMG
- VYVGART for IV infusion was determined to be effective if an anti-AChR antibody positive patient’s MG-ADL score decreased by 2 or more points and stayed at that level for 4 weeks or more in a row, with the first improvement occurring no later than 1 week after the last infusion of treatment cycle 1