“…Therefore, we hypothesized that these acidic metabolites of FS might modulate MRPs and BCRP. MRPs are distributed widely in the body, and transport a number of anticancer drugs such as methotrexate (MTX), vinblastine, 5-fluorouracil, doxorubicine and etoposide [32][33][34]. BCRP is located in brain, breast cells, liver, intestine, kidney, placenta, amd testis [19], and transports a number of anticancer drugs such as MTX, daunorubicin, doxorubicin, gefitinib, imatinib, ireinotecan, mitoxantrone and sunitinib [35].…”