Mechanism Matters: The Future of Targeted Treatments in Myasthenia Gravis

Introduction

In this module, Gil I. Wolfe, MD, FAAN, discusses the evolving role of targeted treatments in generalized myasthenia gravis (gMG), with a focus on C5 inhibitors and FcRn inhibitors, including emerging clinical trial data, mechanism-based treatment selection, safety considerations, dosing and administration logistics, and patient selection factors.

The key points discussed in this module are illustrated with thumbnails from the accompanying downloadable PowerPoint slideset, which can be found here or downloaded by clicking on any of the slide thumbnails in the module alongside the expert commentary.

How many people with MG do you provide care for in a typical month?

A.
1-4
B.
5-10
C.
11-15
D.
16-20
E.
>20
F.
Not applicable

For those who practice in academic or community settings, please indicate your practice setting:

A.
Academic
B.
Community
C.
Not applicable

Which of the following best summarizes recent and emerging clinical trial evidence for targeted C5 inhibitor and FcRn inhibitor strategies in gMG?

A.
Emerging C5 and FcRn inhibitor data support ranking agents across trials based on the largest numerical Myasthenia Gravis Activities of Daily Living (MG-ADL) change, regardless of trial population, endpoint timing, or study design
B.
Emerging data include positive placebo-controlled trials of C5-directed strategies such as cemdisiran and gefurulimab, as well as FcRn-directed strategies such as batoclimab, but findings should be interpreted within each agent’s trial design, population, endpoint, and timing
C.
Recent data show that all complement-directed strategies in gMG have been clinically successful, including oral alternative-pathway inhibition
D.
Emerging FcRn inhibitor data are limited to AChR antibody-positive gMG and do not include evidence in other antibody-defined populations

A 54-year-old adult with AChR antibody-positive gMG has persistent functional symptoms despite standard therapy. The patient is considering targeted therapy and asks how C5 inhibitors and FcRn inhibitors differ in practical clinical use.

Which of the following is the most accurate counseling statement?

A.
C5 inhibitors and FcRn inhibitors have interchangeable mechanisms, so selection should be based primarily on the magnitude of MG-ADL improvement across trials
B.
C5 inhibitors directly block terminal complement activation and require meningococcal-risk mitigation, whereas FcRn inhibitors lower circulating IgG and require attention to infection risk, IgG reduction, dosing model, and monitoring
C.
FcRn inhibitors are used only in AChR antibody-positive gMG, whereas C5 inhibitors are preferred for MuSK antibody-positive and seronegative disease
D.
Route and dosing cadence are similar across targeted gMG therapies, so administration burden should not influence treatment selection

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Mechanism Matters: The Future of Targeted Treatments in Myasthenia Gravis

Gil I. Wolfe, MD, FAAN

Activity

Introduction

How many people with MG do you provide care for in a typical month?​

For those who practice in academic or community settings, please indicate your practice setting:

Which of the following best summarizes recent and emerging clinical trial evidence for targeted C5 inhibitor and FcRn inhibitor strategies in gMG?

How many people with MG do you provide care for in a typical month?