Letrozole in the Treatment of Severe and Recurrent Endometriosis
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government.
Read our disclaimer for details.
Endometriosis is a condition in which abnormal growth of tissue histologically resembling the lining of the uterus (endometrium) is present outside of the uterus. This study will investigate the effect of a daily dose of letrozole compared to GnRH is safe and in addition effective in reducing measurable endometriosis lesions and in reducing pain in patients with active endometriosis which were pretreated with GnRH analogs for 2 months.
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Layout table for eligibility information
Ages Eligible for Study:
18 Years and older (Adult, Older Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Premenopausal women > 18 years of age.
Laparoscopic and Histologically confirmed diagnosis of moderate or severe endometriosis according rASRM-Score III and IV
BMI less than 40 kg/m².
Patient is sexually abstinent or using mechanical (condoms, diaphragms) or sterilization methods of contraception and is willing to continue using them throughout the study.
Patient is willing and able to comply with study requirements.
Written informed consent.
Endometriosis stage I-II acc. according to rASRM
Women with other causes of chronic pelvic pain including infectious, gastrointestinal, musculoskeletal, neurologic or psychiatric.
Significant abnormalities in the physical or laboratory examination including renal and liver function more than twice the normal range.
Patient desires pregnancy for the duration of the study, is pregnant or breast feeding.
GnRH therapy during the last 6 months
Use of hormonal contraception, selective estrogen receptor modulators, progestins, estrogens, steroids, or ovulation induction in the 4 weeks prior to inclusion into the study.
Untreated abnormal pap smear or other gynecologic condition.
History of venous thrombosis events including deep vein thrombosis, pulmonary embolism, or retinal vein thrombosis.
History of stroke, complicated migraine, or documented transient ischemic attack.
Known hypersensitivity to any ingredient of the study medication.
Treatment with other aromatase inhibitors
Other investigational drugs within the past 30 days and the concomitant use of investigational drugs.
History of non-compliance to medical regimens, and patients who are considered potentially unreliable.
Additional protocol-defined inclusion / exclusion criteria may apply