Table 2. Comparison of the apoptosis rate of PC-3 cells in each group ($\overline{x}\pm s$, %).

Groups	Apoptosis rate
Control group	7.33±1.27
Brucine low dose group	15.33±2.49**
Brucine medium dose group	23.25±2.21**
Brucine high dose group	31.71±3.43**

**P<0.01 compared to control group.