ABCG2 and Miyoshi myopathy: In this study, we focused on CD138−CD34−cells because this phenotype cells isolated from MM cell line RPMI 8226 have the characteristics of MM CSCs, which exhibited stronger proliferation, migration, drug resistance to PTX, clone formation ability, tumorigenic potential and more ABCG2 molecular expression than the non-CD138−CD34−cells [23, 24].