EMD is defined as the presence of an MM-cell tumor outside the bone marrow (BM), either in the form of a soft-tissue mass spreading contiguously from the bone and breaking out of the cortical bone (osseous) or arising in an isolated organ not contiguous with bone lesions (extraosseous).4 Epithelial-to-mesenchymal transition-like features in MM patients can be used as biomarkers for EMD; however, the clinical significance of E- and N-cadherin expressions, especially in BM specimens of patients with MM, is still largely unknown and thus needs to be elucidated. The gene discussed is CDH2; the disease is Miyoshi myopathy.