PIK3CA and endometrial carcinoma: Endometrioid ovarian adenocarcinoma is commonly associated with endometriosis, which may occur with synchronous endometrial carcinoma, has a more favourable prognosis compared to high-grade serous carcinoma, and is driven by similar mutations as endometrial endometrioid carcinoma, including PIK3CA, PTEN, CTNNB1, and ARID1A [65].