Bex reduces MDA-MB-231 and DU-145 cell viabilities. Cells were treated with different concentrations (0, 0.01, 0.1, 1, 10, 100, 250 and 500 µg/ml) of Bex for 72 h. Cell viabilities were measured at 24, 48 and 72 h. *P<0.05 vs. 0 µg/ml. Bex, barley grass extract.