CD44 and Miyoshi myopathy: MM cells interact with components in the BM microenvironment to support their own survival and growth.[16] Specifically, MM cells adhere to the extracellular matrix or BMSCs in the bone marrow through adhesion molecules, such as integrin family members,[17] CD138,[17a] CD44,[17, 18] vascular cell adhesion molecule‐1,[19] lymphocyte function‐associated antigen‐1,[18] and intercellular adhesion molecule‐1,[20] leading to the enhancement of their survival and CAM‐DR.