Effect of IKKε siRNA on cell proliferation. (a) SK-BR-3 cells and (b) MCF-7 cells were transfected with siR-1, siR-8, and negative control siRNA (NC). Cell growth was assayed at 72 hours and 120 hours post-transfection using the CellTiter-Glo® Luminescent Cell Viability Assay Kit. Result represented as mean ± standard deviation (n = 3). RLU, Relative Luminescence Unites.