This molecule is bound to CD138 and exerts an influence on the MM cells via the p38 and pERK pathways, which in turn, leads to the expression of Dickkopf-related protein 1 (DKK1) and metalloproteinase-9 (MMP-9), two molecules with a favorable effect on the MM progression [45]. The gene discussed is SDC1; the disease is Miyoshi myopathy.