In terms of MG-related autoantibodies, AChR-Ab was positive in 58 cases (77.3%) and negative in 17 cases (22.7%); 2 cases (2.7%) were positive for MuSK-Ab and 73 cases (97.3%) were negative; no anti-LRP4-Ab positive patients were found. Here, LRP4 is linked to myasthenia gravis.