VSIR and clear cell adenocarcinoma: VISTA expression was detected in 65,1% of High- grade serous carcinoma (HGSC) (95/146), 80% of endometrioid ovarian carcinoma (4/5), 66,7% of mucinous carcinoma (2/3), 40% of clear cell carcinomas (4/10) and in 75% of mixed ovarian carcinoma (3/4).