The purpose of the present study is to comparethe expression levels of Beclin-1 mRNA andprotein in uterine endometria of women withoutendometriosis to those in eutopic and ectopicendometria of endometriosis patients using Realtime-PCR and Western blot analysis, and toevaluate the association between Beclin-1 proteinexpression and serum CA125 levels in theendometriosis group. The gene discussed is BECN1; the disease is endometriosis.