Growth inhibiting effects of β-elemene on HepG2 cells. HepG2 cells were treated with different concentrations drug for 0-96 h. Cell viability was determined by MTT method. This assay was performed in triplicate. Dose- and time-dependent inhibition of cell growth could be observed after 96 h (P<0.05, ANOVA analysis). *P<0.05, **P<0.01 versus 24 h; #P<0.05 versus 10 μg/mL β-elemene group.