The SWI/SNF complex is mutated in > 20% of all human cancers, and the ARID1A (At‐rich interactive domain, also known as BAF250A) subunit is especially prone to somatic mutations in gynaecologic cancers, although its role in endometrial tumorigenesis is not fully understood [8, 9, 10, 11]. This evidence concerns the gene ARID1A and cancer.