Current endometriosis therapy is based on interrupting the menstrual cycle and suppression of estrogen synthesis in order to induce atrophy of endometrial tissue. Progestins, oral contraceptives, androgenic agents, aromatase inhibitors, gonadotropin-releasing hormone analogues all play a role in the treatment of endometriosis. However, none of these treatments can definitely cure the disease and they require long-term use despite the side effects of the drug. It is clear that new treatment methods are needed for this disease, and therefore many different new treatment methods are being investigated. Some of the treatment methods have focused on inhibiting angiogenesis and inflammation, which seems to play an important role in the progression of the disease. In the present study, it was investigated whether ezetimibe which is a cholesterol absorption inhibitor with anti-inflammatory and antiangiogenic properties, has therapeutic effect on endometriosis in an experimental rat model.

Endometriosis is a relatively common benign disorder that causes significant health problems with yet an unknown etiology. The disease which is defined as the presence of the endometrial gland and stroma outside the uterine cavity, was first described by the famous pathologist Von Rokitansky in 1860. Since then, new theories about the mechanism of its occurrence have been put forward, but no single theory has been holistic enough to explain all clinical presentations of the disease. Retrograde menstruation, stem cell theory, immune system, genetic and environmental factors are among the proposed theories. However, with the widespread use of molecular methods in recent years, more detailed information about its etiopathogenesis has been obtained and new approaches have been proposed for its diagnosis and treatment. Today, it is accepted that multiple factors, including ectopic endometrial tissue, altered immune system response, imbalanced cell proliferation and apoptosis, abnormal endocrine signal and genetic factors, play a role in the pathogenesis of endometriosis, which is a progressive, estrogen-dependent inflammatory disease.

In recent years, studies on the inflammatory and angiogenesis mechanisms that play a role in the pathogenesis of endometriosis have intensified in the treatment of the disease. Agents with anti-inflammatory and antiangiogenic effects have been experimentally shown to partially prevent the formation or reduce the size of endometriotic lesions in animal models. Statins like atorvastatin and simvastatin have been using in the treatment of coronary artery disease with their antilipidemic effects and are shown to have efficacy in animal endometriosis models with their anti-inflammatory and antiangiogenic properties.

Ezetimibe, which is a member of a different class of antilipidemic agents than statins, has similarly been shown to inhibit the release of substances that play a key role in the inflammatory process such as nuclear factor kappa, TNF-α and interleukin 1, and angiogenesis such as VEGF. With this mechanism of action, it may be hypothesized that this agent may have a possible therapeutic effect on endometriosis. Therefore in this study it was aimed to assess the potential therapeutic role of ezetimibe in the experimental rat endometriosis model.

Inclusion Criteria:

• non-pregnant, sexually mature albino rats weighing between 180-240 g

Exclusion Criteria:

• pregnant, non-healthy, sexually immature, weighing <180 g

the outcome assessors who measured the sizes of the post-treatment explants, and who histopathologically evaluated the explants were blinded to the groups