Beclin-1 protein expression ofeutopic endometria in patients with endometriosiswas negatively correlated with serum CA125 level.Since Beclin-1 is an autophagy-related protein,it was deduced that the ability of cells to undergoautophagy was reduced in ectopic and eutopic endometriaof patients with endometriosis, and thatautophagy might be related to the pathogenesisand progression of endometriosis. Here, BECN1 is linked to endometriosis.