CASC3 and Miyoshi myopathy: Fluorescence microscopy images revealed a marked increase in 7‐AAD staining (red) after treatment of GFP‐labeled PS‐R cells cultured with HS‐5 cells with the CPT/BTZ regimen (Supplemental Figure S3B), arguing that CPT/BTZ exposure is lethal to BTZ‐resistant MM cells cultured with human stromal cells.