SDC1 and Miyoshi myopathy: Given that DEK expression was lower in the primary CD138positive cells, next we tested the expression level of CD138 in MM cell lines using RT-qPCR and found a moderate (1.8 fold) but significant (P<0.01) increase in the expression level of CD138 in RPMI-shDEK cells compared to control RPMI-sh-Negative cells (Fig 7A).