AMACR and endometrial endometrioid adenocarcinoma: A 2013 study by Oluwole Fadare et al., which used AMACR to differentiate clear ECCC from endometrioid and serous carcinoma, found that AMACR expression in ECCC (75%) was significantly higher than endometrial serous carcinoma (15%) and endometrioid carcinoma of the endometrium (22%).