Estradiol-mediated Inflammation and Central Sensitization in the Pathophysiology of Endometriosis-associated Pelvic Pain

Recruitment Status
RECRUITING
(See Contacts and Locations)Verified January 2026 by University of Michigan
Sponsor
University of Michigan
Information Provided by (Responsible Party)
Sawsan As-Sanie
Clinicaltrials.gov Identifier
NCT07100782
Other Study ID Numbers:
HUM00229564
First Submitted
July 26, 2025
First Posted
August 2, 2025
Last Update Posted
February 17, 2026
Last Verified
January 2026

ClinicalTrials.gov processed this data on February 2026Link to the current ClinicalTrials.gov record .

History of Changes

Study Details

Study Description

All clinical activities will be performed at University of Michigan (note that recruitment may occur at locations outside of University of Michigan, such as Trinity Health, Ann Arbor, MI and Henry Ford, Detroit, MI and via social media and regional patient support groups). Endometrial biopsies will be sent via overnight courier to Dr. Jie Yu's laboratory at The University of Buffalo for analysis.

Condition or DiseaseIntervention/Treatment
EndometriosisPelvic Pain
Drug: Relugolix CT

Study Design

Study TypeInterventional
Actual Enrollment130 participants
Design AllocationN/A
Interventional ModelSingle Group Assignment
MaskingNone (Open Label)
Primary PurposeTreatment
Official TitleEstradiol-mediated Inflammation and Central Sensitization in the Pathophysiology of Endometriosis-associated Pelvic Pain
Study Start DateDecember 7, 2025
Actual Primary Completion Date2yrs 2mos from now
Actual Study Completion Date2yrs 3mos from now

Groups and Cohorts

Group/CohortIntervention/Treatment
Relugolix CT
All participants will have the same intervention, but approximately half of those enrolled will have widespread pain and half will not. Approximately 65 participants with widespread pain will receive relugolix CT (relugolix 40mg, estradiol 1 mg, norethindrone acetate 0.5 mg once daily) daily for 24 weeks, and 65 participants without widespread pain will receive relugolix CT for 24 weeks.
Drug: Relugolix CT
Study medication will be provided by Sumitomo in pill bottles containing an 84-day supply of relugolix 40mg, estradiol 1mg, norethindrone acetate 0.5mg (Relugolix Combination therapy).

Outcome Measures

Primary Outcome Measures
  1. Change score in lipopolysaccharide (LPS)-stimulated Macrophage inflammatory protein-1 alpha (MIP1-α) levels
    LPS-stimulated MIP1-α levels measured from whole blood
  2. Change score for functional magnetic resonance imaging (fMRI) connectivity of the somatosensory cortices to the default-mode network
    Assessed using a functional connectivity MRI (fcMRI) at rest and applied pain
Secondary Outcome Measures
  1. Change scores for pelvic pain interference
    Pain interference assessed using the Patient-Reported Outcomes Measurement Information System (PROMIS) 29+2 Profile v2.1 pain interference domain. Each domain ranges in score from 4-20 and the higher the score indicates greater pain interference in the past 7 days.
  2. Change score for temporal summation at the forearm
    Temporal summation is calculated as the mean difference in pain ratings evoked by the single stimuli and the trains of stimuli using a 0-100 NRS.

Eligibility Criteria

Ages Eligible for Study(Adult)
Sexes Eligible for StudyFemale
Accepts Healthy VolunteersNo
Inclusion Criteria
Premenopausal woman between age 18 and 49 years (inclusive) at the time of consent. Menopause is defined as amenorrhea \>1 year unrelated to hormonal suppression.
History of endometriosis diagnosed by surgery (visual or biopsy confirmed), ultrasound, or MRI within 10 years of study entry
History of self-reported moderate to severe pelvic pain for ≥ 6 months' duration at time of screening visit.
Willingness to participate in a relugolix CT drug intervention trial
Has not used an injectable hormone therapy in the past 6 months (e.g. DepoProvera®, DepoLupron®).
Willingness to 30-60 day washout interval of oral, vaginal, transdermal, intrauterine hormonal therapies prior to study initiation if applicable
Willingness to use 2 forms of non-hormonal contraception during the entire duration of the study period or has had a history of a bilateral tubal occlusion procedure at least 3 months prior to screening (tubal ligation or hysteroscopic occlusion method)
Willing to undergo quantitative sensory testing (QST), fMRI and other study procedures
Ability to read and speak English to allow for written informed consent, phenotyping, and patient-reported outcomes measures
Meet criteria to participate in QST and fMRI. These include:
Normal visual acuity or correctable (with corrective lenses- glasses or contacts) to at least 20/40 for reading instructions in the MRI and visual sensitivity testing
No contraindications to MRI (e.g., metal implants, claustrophobia)
Willingness to refrain from pain medications such as NSAIDs, acetaminophen, and opioids for 12 hours prior to neuroimaging and QST
Willingness to refrain from alcohol and nicotine on day of QST and neuroimaging (alcohol and nicotine consumption is allowed after testing is completed)
Willingness to refrain from physical activity or exercise that would cause muscle and/or joint soreness for 48 hours prior to testing (routine exercise or activity that does not lead to soreness is acceptable)
Able to lie still on their back for 1 hour during MRI
Weigh 300 pounds or less. Additional inclusion criteria to proceed with Study Visit 2 and clinical trial:
\>60% complete entries in daily electronic diary (end-of-day pain, bleeding, fatigue scores)
Minimum of two menstrual flows separated by a minimum of 21 days (d1 bleed to next d1 bleed) during the washout/screening period
Moderate-severe non-menstrual pain and dysmenorrhea confirmed with daily electronic diary in the washout/screening period.
Exclusion Criteria
Contraindication to the use of relugolix CT (high risk of arterial or venous thrombotic, or thromboembolic disorder, known osteoporosis, current or history of breast cancer or other hormone sensitive malignancy, known hepatic impairment or disease, undiagnosed abnormal uterine bleeding, known hypersensitivity to components of relugolix CT).
Concurrent participation in other therapeutic trials
Pregnant, lactating, less than 6 months postpartum, or planning a pregnancy within next 12 months
Planning pelvic or abdominal surgery during study period
Prior major surgery in the past 4 months that involves incisions on the abdomen, chest, head, other than a skin biopsy (hysteroscopy, endometrial biopsy is ok to include).
Planning to initiate a new adjunctive pain treatment during study treatment (e.g. cognitive behavioral therapy, physical therapy, acupuncture). Participants may be enrolled if these treatments are completed prior to trial or using stable therapies.
History of hysterectomy and/or bilateral oophorectomy
Clinically significant gynecologic condition such as significant endometrial pathology (e.g. endometrial hyperplasia), persistent ovarian cyst larger than 5 cm, largest uterine dimension \>15 centimeters and not planning an additional intervention or treatment for endometriosis, or another uterine or ovarian condition during the study period. Patients may be enrolled in this study if they were previously successfully treated for these conditions. Patients must have undergone pelvic ultrasound or MRI in the past 6 months, and provide results (or release of records to obtain results)
History or current evidence of psychosis, current suicide risk or attempt within 2 years of study (note: participants with mood disorders such as depression or anxiety will not be excluded)
Chronic opioid, alcohol, and/or illicit drug use
History of substance abuse within past one year
Unable or unwilling to discontinue opioids analgesics within 48 hours of the dense phenotyping study visits
Medical conditions that may significantly interfere with relugolix CT efficacy, ability to fully comply or would make it unsafe for participants to take part in the study, including but not limited to: morbid obesity with Body Mass Index \> 45, uncontrolled autoimmune/inflammatory diseases, significant cardiopulmonary disease (e.g., angina, congestive heart failure, uncontrolled hypertension, severe cardiac valvular disease, Chronic Obstructive Pulmonary Disease (COPD), chronic asthma), renal or liver disease (e.g. cirrhosis, hepatitis), uncontrolled endocrine or allergic disorders (e.g., hypothyroidism, diabetes, allergic rhinitis), neurologic conditions (e.g., multiple sclerosis, prior stroke, neurological tumor), severe physical impairment (e.g., blindness, deafness, paraplegia); and active malignancy (any malignancy except for localized dermatologic cancer).
Any impairment, activity or situation that in the judgment of the Study Coordinator or Principal Investigator would prevent safe or satisfactory completion of the study protocol.
Individuals receiving or applying for compensation or disability and other aspects associated with potential secondary gain per self-report;
Additional exclusion that prevent participation in QST and fMRI: 1. Severe claustrophobia precluding MRI and evoked pain testing during scanning; 2. Diagnosed peripheral neuropathy 3. Diagnosed epilepsy 4. Diagnosed or self-reported visual-evoked migraines can participate in study, but will not participate in the visual testing procedures. 5. Weigh \>300 pounds

Contacts and Locations

Sponsors and CollaboratorsUniversity of Michigan
Locations
University of Michigan | Ann Arbor Michigan, United States, 48109
Investigators
Principal Investigator: Sawsan As-Sanie, MD, MPH, University of MichiganPrincipal Investigator: Andrew Schrepf, PhD, University of Michigan