ABCG2 and ovarian serous cystadenocarcinoma: Then, GTEx dataset was used as control for the normal tissues, and we evaluated the ABCG2 expression differences between tumor and normal tissues of CESC, CHOL, brain lower grade glioma (LGG), ovarian serous cystadenocarcinoma (OV), UCEC, and uterine carcinosarcoma (UCS) (p < 0.05, Figure 1B).