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Background: Endometriosis is one of the most common causes of infertility in women. Despite extensive research on the subject, early-stage diagnosis remains challenging. Histologically, normal endometriosis does not differ from the eutopic endometrium, shifting the focus of investigation to the molecular level.Objective: To assess the immunohistochemical markers ER, PGR, Ki-67, BCL-2, and MMP-9 in