Effect of upregulation of E2F1 on cell pump rate of doxorubicin, cell cycle, and apoptotic rate in SGC7901/DDP cells. A: IC50 values for anticancer drugs in SGC7901/DDP cells; B, C: Pump rate of doxorubicin in SGC7901/DDP cells stably expressing E2F1 was analyzed by flow cytometry; D, E: Percentages of apoptotic cells were analyzed by flow cytometry. F: Cell cycle of SGC7901/DDP cells after E2F1 gene transfection was analyzed by flow cytometry. All values are mean ± SE. *
P < 0.05 for E2F1 group versus GFP group and NC group.