SDC1 and Miyoshi myopathy: As a co‐receptor, CD138 strongly promotes HGF‐induced signaling by promoting the dimerization of c‐met.33 c‐met mRNA and protein expression were found to be higher in CD138+ cells than in CD138‐ cells.11 These results support the potential clinical use of SL1 by only targeting MM cells as opposed to healthy cells.