Table 1.

Inhibitory effect of Venenum bufonis ethanol extract on U2OS colony formation

Group	Concentration (mg/L)	Colony formation rate (%)
Blank control group	-	96.8±1.3
5-Fu group	50	79.1±3.6
Venenum bufonis ethanol extract 1	12.5	90.3±4.1
Venenum bufonis ethanol extract 2	25	89.4±2.7
Venenum bufonis ethanol extract 3	50	85.5±4.8
Venenum bufonis ethanol extract 4	100	82.8±3.1
Venenum bufonis ethanol extract 5	200	80.2±3.2

Note: comparison of each dose group with the blank control group, P<0.05.