Roots methanol extract had good cytotoxic effects on a panel of human cancer cell lines with the IC50 values of 7.79 μg/mL (CCRF-CEM cells), 22.63 μg/mL (CEM/ADR5000 cells), 3.27 μg/mL (MDA-MB-231 cells), 16.67 μg/mL (MDA-MB-231/BCRP cells), 14.66 μg/mL (HCT116 p53+/+cells), 5.98 μg/mL (HCT116 p53−/−cells), 4.15 μg/mL (U87MG cells), 16.35 μg/mL (U87MG.ΔEGFR cells), and 12.99 μg/mL (HepG2 cells) (Kuete et al., 2014e). Here, ABCG2 is linked to cancer.