To investigate the expression of Beclin-1 mRNA and protein in eutopicand ectopic endometrium of women with and without endometriosis, and evaluate theassociation of Beclin-1 protein expression and serum CA125 levels in the endometriosisgroup due to CA125 being a well-known biomarker of endometriosis. Here, BECN1 is linked to endometriosis.