Olink Proteomics Analysis Reveals Heterogeneous Responses to FcRn Blockade in Anti‐ AChR Antibody‐Positive Myasthenia Gravis: FGF ‐19 as a Novel Biomarker

EFG treatment can alleviate the clinical symptoms and decrease IgG levels in patients with MG. The downregulated expression following EFG treatment, along with the findings of in vitro experiments, indicates that FGF-19 may not only act as a biomarker for the efficacy of EFG, but also play a role in promoting the differentiation of B cells into plasma cells, thereby offering a novel target for therapeutic interventions.