Figure 1

ESI inhibits the growth of lung cancer cells H1299 and A549. (a) The molecular structure of ESI. (b) Cells were incubated with various concentrations (up to 51.2 μM) of ESI for 24 and 48 h and their viability was then determined by WST-1 assay. (c and d) ESI inhibited the colony formation ability of H1299 and A549 cells. All data were representative of three independent experiments. Bars, S.E.M.; *P<0.05, **P<0.01, ***P<0.001