Song et al. (Song et al., 2020) disclosed that silence of circ_0007841 could reduce the half-maximal inhibitory concentration and chemoresistance in doxorubicin-resistant MM cells; inversely, overexpression of circ_0007841 could upregulate the ATP-binding cassette transporters G2 (ABCG2) messenger RNA, thus inducing chemoresistance in doxorubicin-resistant MM cells, suggesting that circ_0007841 enhanced MM chemoresistance through upregulating ABCG2. This evidence concerns the gene ABCG2 and Miyoshi myopathy.