Figure 2.

Effect of siRNAs in Combination with Etoposide on Cell Survival. The HL-60 cells were transfected with siRNA for 6 h and then exposed to etoposide at indicated concentrations. Twenty-four hours after transfection, the cell survival was measured using MTT assay. The cell survival curves were plotted by GraphPad software (A, B and C). Data are showed as mean ± SD of three experiments. The combination index (CI) values were calculated using the fractional affected (Fa) values of MTT assay and CalcuSyn software (D, E, F and G)