Among them, P-glycoprotein (P-gp/ABCB1), multidrug-resistant protein 1 (MRP1/ABCC1), breast cancer resistant protein (BCRP/ABCG2/MXR/ABCP), and multidrug-resistant protein 10 (ABCC10/MRP7) transporters frequently drive chemosensitive cancers to MDR [41]. This evidence concerns the gene ABCG2 and cancer.