ABCB1 and neoplasm: Examples of these are the transporter pumps, such as the ATP binding cassette (ABC) family members, including MDR1 or P-glycoprotein-P-GP- (ABCB1), Multidrug Resistance-Associated Protein 1 (MRP1) and Multidrug Resistance-Associated Protein 3 (MRP3) or Breast Cancer Resistance Protein (BCRP), which promote drug transport outside the cell in tumor pathology [9].