CTNNB1 and ovarian endometrioid adenocarcinoma: In research directly comparing the mutation profiles of cases with endometrioid carcinoma of the ovary and endometrium, loss of expression in ARID1A, PTEN, and MSI-H is more commonly observed in the endometrium than in the ovary, while CTNNB1 mutation is statistically more prevalent in the ovary than in the endometrium17.