CD79A and Miyoshi myopathy: An earlier study found that patients with multiple sites of osteolytic lesions at diagnosis had a higher incidence of extramedullary relapse (62.5% vs. 37.5%), and extramedullary relapse patients were relatively younger (60 vs. 63 years, p = 0.073), and more commonly diagnosed with the IgA (25.8% vs. 20.8%) and non-secretory types of MM (2.2% vs. 0) [34].