ABCG2 and cancer: Many lncRNAs upregulate ABC transporter expression and contain metastasis-associated lung adenocarcinoma transcript 1 (MALAT1), which is upregulated in PTX-resistant non-small-cell lung carcinoma; cancer susceptibility candidate (CASC9), which is upregulated in doxorubicin-resistant MCF-7/ADR; and MRUL, which is upregulated in doxorubicin- and vincristine-resistant gastric cancer [163].