HLA-G and Infertility: Considering the link of endometriosis with granulosa cell dysfunction and thepossible role of sHLA-G as a marker for oocyte quality, the rationale of this studyis to investigate the association between the concentrations of sHLA-G detected inthe follicular fluid of infertile patients with peritoneal endometriosis submittedto IVF compared to non-endometriotic patients (tubal factor) as the primary outcomeand its effect in some important reproductive outcomes.