Multidrug resistance(MDR)is a major impediment to the cancer chemotherapy.Multidrug resistance associated protein 1(MRP1/ABCC1)is thought to be one of the main transmembrane proteins that mediate tumor multidrug resistance.Exploring its structure and function,as well as the relationship between MRP1/ABCC1and tumor,will be beneficial to provide an optimal strategy and evaluate the prognosis of tumor.