TNFSF13B and Miyoshi myopathy: These cells support MM cells by producing a wide variety of cytokines, antiapoptotic and growth factors, for example, macrophage inflammatory protein-1α (MIP-1α), tumor growth factor β (TGFβ), B-cell activation factor (BAFF), A proliferation-inducing ligand (APRIL), and most importantly interleukin-6 (IL-6) [2] (Fig. 1).