Expression of siRNAs designed to specifically target each of Sept9 long isoforms in SKBr3 breast cancer cells (a cell line, that expresses the three isoforms compared to MCF7 cells that expresses only Sept9_i1 (Fig. 2b)), revealed the specificity of the Sept9 isoform-targeting antibodies (Fig. 2a). Here, SEPTIN9 is linked to breast carcinoma.