Apoptosis in MCF-7 cells that were treated with anti-CA1 siRNA, as measured using an annexin V cell apoptosis assay. (a) The cells without siRNA treatment were used as controls. (b) The cells treated with Allstars siRNA were used as negative controls. (c) The cells were treated with anti-CA1 siRNA. (d) The result of apoptosis assay is shown in a graph. *indicates p < 0.05, **indicates p < 0.01, ***indicates p < 0.001.