LRP4 and myasthenia gravis: Approximately 80%-85% of MG cases are acetylcholine receptor antibody-positive myasthenia gravis (AChR-MG), 5%-8% of cases are muscle-specific tyrosine kinase antibody-positive myasthenia gravis (MuSK-MG), less than 1% of cases are low-density lipoprotein receptor-related protein 4-positive MG, and approximately 10% of cases are double seronegative MG [1].