In the present study, we used one of these new antibodies to perform GATA2 IHC on FFPE endometrial biopsies and resections and scored GATA2 expression in endometrial glandular and stromal cells across a cohort of normal endometrium, hormone-treated endometrium, inactive endometrium, endometrial polyps, endometriosis, and EAH/EIN. Here, GATA2 is linked to endometriosis.