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Pregnancy rates obtained with oocyte donation (OD) are the highest when compared to any other assisted reproduction technique (ART). OD is not only the solution for many infertile couples but also a reference model for obtaining useful knowledge of the physiology of reproduction and consequently to be applied in other ART. One of the controversies regarding ovarian stimulation for in vitro fertilization (IVF) regards the impact that successive cycles could have on oocyte recovery in terms of quality and quantity of the obtained oocytes. Age of the recipient, smoking, body mass index (BMI), and endometriosis are the various factors influencing embryo implantation. Endometriosis could affect uterine receptivity through alteration of the local environment by means of endocrine and paracrine mechanisms or due to changes in immune response. Gonadotropin-releasing hormone (GnRH) analogs could have a positive effect on the physiology of endometrial cells of patients with endometriosis.
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