CXCL12 and Miyoshi myopathy: RNA aptamer for CXCL12: CXCL12, also known as stromal cell-derived factor-1 (SDF-1), is a chemoattractant chemokine that, upon binding to its receptors CXCR4 and CXCR7, induces the adhesion and homing of MM cells to the protective BM niche [39,40], and therefore, it is considered one of the major players in cell adhesion-mediated drug resistance (CAM-DR) [40].