LRP4 and myasthenia gravis: Its global prevalence is 150 to 250 per million population, and its incidence rate has been increasing.[1,2] Although the cause of MG remains complicated and unclear, a large number of studies have shown that some pathogenic antibodies cause the incidence of MG, such as acetylcholine receptor antibody (AchRAb), muscle-specific receptor tyrosine kinase (MuSK), and low-density lipoprotein receptor-related protein 4 (LRP4).