ABCG2 and cancer: IC50 values below 20 μg/mL were recorded with the same crude extract in three cancer cell lines (MDA-MB-231-pcDNA, IC50 = 19.43 ± 0.88 μg/mL; MDA-MB-231-BCRP, IC50 = 18.87 ± 1.16 μg/mL; U87MG.ΔEGFR, IC50 = 17.34 ± 1.37 μg/mL) [21].