Cause of cell death for PEITC treated cells. PARP cleavage is increased by treatment with PEITC in multiple ovarian cancer cell lines, indicating death by apoptosis. Western blot for full length and cleaved PARP after 48 hours of treatment is displayed. Blots are representative images of band intensity. Bar graph represents cleaved PARP band intensity normalized to β-actin. * p < 0.01, # p < 0.05, n.s. = not significant.