Additionally,, although the tendency of the impact of knockdown of KLF11 (by KLF11-S1 and KLF11-S2) on MCF7, SK-BR-3, and MDA-MB-232 cell lines was same, the induced extent of the cell apoptosis by different sequence of KLF11-siRNAs in different molecular subtype BC cell lines was shown to be different. This evidence concerns the gene KLF11 and breast cancer.