Interestingly, comparative analysis of the basal‐like vs. luminal breast cancer cell types markers in ABI1 KO mice showed that the genes of basal‐like cells (Krt14, Vim) are responded to Abi1 depletion, however luminal cell type genes markers (Krt8, Krt18, Sox9, Estr1) do not (Table S7). Here, SOX9 is linked to breast cancer.