ABCG2 and cancer: Furthermore, the rank order of potency for PG01037, NGB2904, SB-277011A, and U99194 to reverse resistance to mitoxantrone in the cancer cells overexpressing ABCG2 transporters was similar to the rank order of the docking scores for the ABCG2 binding, which were −9.704, −9.299, −9.068, and −6.525, respectively [19].