Parthenolide and costunolide reduce reattachment efficiency of human breast carcinoma cells. Real-time electrical impedance monitoring shows that parthenolide (10 μM) and costunolide (25 μM) significantly reduce attachment when compared to vehicle while Taxol (0.5 μg/ml) and resveratrol (50 μg/ml) did not. Colchicine (50 μM) reduced attachment to a greater extent in Bt-549 than in MDA-MB-157. Lines, mean for three triplicate wells; bars, SD; representative graph is shown. Three independent experiments were performed [see Additional file 4: Figure S4].