“…44 Parthenolide, a sesquiterpene lactone well known in natural medicine, can reverse the vinorelbine resistance of SP cells in MCF-7 breast cancer cells. 45 A combination of stealthy liposomal vinorelbine and stealthy liposomal parthenolide can fully inhibit the MCF-7 cell xenograft growth. 45 Moreover, some phytoestrogens/flavonoids, such as genistein, naringenin, acacetin and kaempferol, which have less effect on drug-sensitive leukemia K562 cells, can potentiate the cytotoxicity of SN-38 and mitoxantrone in breast cancer resistance protein (BCRP)-transduced K562 (K562/BCRP) cells, indicating these phytoestrogens/flavonoids may reverse multidrug-resistance protein (MRP)-mediated chemotherapy resistance.…”