Leuprolide acetate induces eutopic endometrial epithelial cell apoptosis. A: Leuprolide acetate (100 ng/mL) up-regulated the expression of cleaved Caspase 3. B: Apoptosis detected through TUNEL staining. Compared with the normal group (untreated), the rate of apoptosis in eutopic endometrial epithelial cells after treatment with 25, 50 and 100 ng/mL Leuprolide acetate was statistically significant. *P <0.05.