IL1B and endometriosis: The comparison between eutopic and non-endometriosis endometrium revealed that in the proliferative phase (Figure 3), the expression of IL-15 in non-endometriosis endometrium decreased by 92.3% in relation to that in the eutopic endometrium, whereas IL-1α and IL-1β expression decreased by 97.9% and 97.1%, respectively.