Both Org OD 02-0 concentrations mimicked the effects of P4 by upregulating the expression of IGFBP1, PRL, HAND2, and ZBTB16 in control, eutopic, and ectopic cells from women with endometriosis (Figure 2a–d), suggesting the involvement of mPRs in the decidualization process of endometrial cells. Here, IGFBP1 is linked to endometriosis.