CD138 is a well‐known surface antigen for MM and PC in BM.26 To determine whether SL1 can recognize MM cells from clinical specimens, BM samples from patients (n = 4) were stained with CD138‐APC antibody and co‐stained with FAM‐labelled SL1 or the DNA control library. The gene discussed is SDC1; the disease is Miyoshi myopathy.