SOX17 was highly expressed in the endometrial epithelia of women without endometriosis at the proliferative (H-score; 288.00 ± 8.25) and secretory phases (H-score 278.57 ± 9.01), However, its expression was significantly decreased in the endometrial epithelia of women with endometriosis at the proliferative (H-score; 119.29 ± 38.83) as well as secretory phases (H-score 48.57 ± 12.94) compared with controls (Fig. 5a, b). This evidence concerns the gene SOX17 and endometriosis.