Mutations in ARID1A have been identified in approximately 50% of ovarian clear cell carcinomas and ovarian endometrioid carcinomas [7]; multi‐genomic sequencing technologies have confirmed that SWI/SNF is the most frequently mutated chromatin remodelling complex in human cancers, with the overall incidence of mutations in its subunits being approximately 20% across various cancers [6]. This evidence concerns the gene ARID1A and ovarian clear cell cancer.