ABCG2 and breast cancer: While the family of ABC transporters is associated with the development of chemoresistance in multiple solid tumors, expression of multi-drug-resistant protein-1 (ABCC1/MRP1), multi-drug-resistant protein–8 (ABCC11/MRP8), and the breast cancer resistance protein (ABCG2/BCRP) are more likely to be enriched in TNBC compared to other breast cancer subtypes [92,93].