ABCG2 and ovarian neoplasm: Moreover, it has been reported that there were high levels of ABCA1, ABCB5, and ABCC3/MRP3 expressions in ovarian tumor tissues [72] and high levels of ABCA1, ABCB1/MDR1/P-GP, and ABCG2/BCRP expression in ovarian CSCs [71, 73–75].