“This study demonstrates that some putative flavonoids, i.… (quercetin and kaempferol) and isoflavones (genistein and daidzein ) markedly increase the sensitivity of the multidrug-resistant … carcinoma KB-V1 cells (high Pgp expression) to vinblastine and paclitaxel dose-dependently, and also decrease the … of these anticancer- drugs in KB-V1 cells.”