Corelation with the mutations in ARID1A gene and PIK3CA activating mutations, PTEN loss, CTNNB1 mutations, KRAS mutations, TP53 loss [154,160,181,182],ARID1A mutations occur in 46–57% of CCOS [154],ARID1A mutations are absent in high-grade serous ovarian carcinomas [156]. Here, ARID1A is linked to ovarian serous carcinoma.