FOLR1 and endometrioid adenocarcinoma: We observed that the expression of ERBB3 and MUC1 is higher in mucinous and clear than in serous and endometrioid carcinoma; the expression of B7H4 is higher in clear and serous than in mucinous and endometrioid; FOLR1 expression is significantly higher in serous, clear and endometrioid than in mucinous.