Nevertheless, SF-1, expressed in eutopic and ectopic endometria from women with endometriosis, aberrantly activates CYP19A1 and the expression of P450Arom in stroma [10–12] or gland [13, 14] in these tissues as has been extensively described favoring this estrogenic microenvironment in this disease. This evidence concerns the gene CYP19A1 and endometriosis.