In Vitro: PI-828 (0.01-100 μM) exhibits cytotoxic effect on the 4T1 breast cancer cells and 4306 ovarian cancer cells. PI-828 (0.78-3.12 µM; 48 hours) decreases caspase 3 activation; higher concentrations of PI-828 (6.25-12.5 μM) alone causes apoptosis.