Though Compound 8 was active on all the tested cancer cell lines, no IC50 below 4 μg/ml was recorded, the lowest values being 7.86 μg/mL against CEM/ADR5000 cells. Interestingly, none of the selected extracts and compounds was more toxic towards AML12 normal hepatocytes (IC50 > 40 Mg/mL) than cancer cell lines, suggesting their good selectivity. Importantly, collateral sensitivity (hypersensitivity) was also observed with A. arundinaceum extract towards CEM/ADR5000 cells (degree of resistance of 0.76) and U87MG.ΔEGFR (degree of resistance of 0.95) compared to their respective sensitive counterparts CEM/CEM and U87MG. This extract was also more active against hepatocarcinoma HepG2 as compared to AML12 normal hepatocytes, confirming its selectivity to cancer cells (Table 1). Despite the fact that compound 8 showed moderate activities, it also displayed better collateral sensitivity of MDR cell lines compared to doxorubicin. The use of natural products to fight multidrug resistance is an attractive strategy in chemotherapy [37-39]. P-gp-expressing CEM/ADR5000 as well as p53 knock out HCT116 (p53-/-) and BCRP-expressing U87MG.ΔEGFR cells were less cross-resistant towards the best samples namely