The lncRNA KCNQ1OT1 is highly expressed in lung adenocarcinoma cells and the knockdown of lncRNA KCNQ1OT1 significantly decreased the expression of MDR1/ABCB1 in A549 adenocarcinomic human alveolar basal epithelial/human ovary cells derived from metastatic site (PA1) cells [28]. Here, ABCB1 is linked to lung adenocarcinoma.