ABCG2 and acute myeloid leukemia: The IC50 values were in a range from 4.09 μg/mL (U87MG.ΔEGFR cells) to 13.60 μg/mL (HepG2 cells) for VSL from 10.57 μg/mL (CCRF-CEM) to 34.01 μg/mL (U87MG.ΔEGFR) for GQW, and from 9.14 μg/mL (U87MG.ΔEGFR) to 32.02 μg/mL (MDA-MB-231-BCRP) for AML.