Fig. 1.

Charts show cell viability following treatment of Ishikawa cells with varying concentrations of (a) DHA alone, (b) cisplatin alone, or (c) DHA and cisplatin determined by the MTT assay. Inhibitory effect of DHA on cell survival was expressed as a percentage of the inhibition ratio. Data was expressed as mean ± standard deviation of three independent experiments. *p < 0.05 was statistically significant when compared to control cells. †p < 0.01 was statistically significant when compared to control cells. DHA: dihydroartemisinin; MTT: 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay