MYOM2 and Miyoshi myopathy: The most important pathological features of MM patients are the abnormal proliferation of monoclonal plasma cells in the bone marrow, secretion of a large amount of monoclonal immunoglobulins (M protein), and the deposition of M protein in related tissues or organs, resulting in corresponding injuries, such as multiple osteolysis, abnormal blood loss, and kidney injury [4, 5].