In the present study, 11 (16.3%) of ovarian high-grade serous carcinomas, 1 (5.5%) of ovarian clear cell carcinomas, and 11.1% of ovarian and 5.1% of endometrial endometrioid carcinomas showed focal and weak staining for GATA3, and the mean calculated H score was 10.6. This evidence concerns the gene GATA3 and serous adenocarcinoma.