Mutations in the genes encoding the subunits of the SWI/SNF complex such as ARID1A (the most frequent), ARID1B, SMARCA4, SMARCA2, SMARCC2, SMARCC1, and PBRM1, promote several key hallmarks of cancer such as cell proliferation and survival, invasion, stemness, and interactions with the other oncogenic pathways, which in turn increases the aggressiveness of BC (26, 40). Here, ARID1A is linked to breast cancer.