Clinical trial Recruiting at 1 site Observational Ages 12 to 25 Women only

Comparing progesterone options for endometrial protection in young women on estrogen therapy

Official title: Assessment of Endometrial Thickness Among Adolescent and Young Adult Patients on Estrogen Replacement Therapy Using Continuous Oral Micronized Progesterone Versus the Etonogestrel Implant: a Prospective Pilot Study

Run by University of Colorado, Denver · NCT06357442 · Data updated 2026-11-12

This study is testing whether oral progesterone or a hormone implant is better at protecting the uterus in young women who are taking estrogen therapy.

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Quick facts

Study typeObservational
Ages12 Years to 25 Years
SexWomen only
Enrollment34 (estimated)
SponsorUniversity of Colorado, Denver
Academic / other
Drugs / interventionschemotherapy, radiation
Locations1 site (Aurora, Colorado)
StatusRecruiting
StartedJuly 1, 2024
Main results expectedJuly 1, 2026
Study endsJuly 1, 2026
Registry record updatedDecember 6, 2024
Trial IDNCT06357442 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are females aged 12-25 with primary ovarian insufficiency or hypogonadotropic hypogonadism who require estrogen replacement therapy.

Probably not a fit

Patients with uterine abnormalities or those who have undergone chemotherapy or radiation therapy may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study aims to compare endometrial thickness in adolescent and young adult patients on estrogen replacement therapy who are treated with either oral micronized progesterone or the etonogestrel implant. Participants will undergo two pelvic ultrasounds and complete surveys to assess satisfaction, side effects, and adherence to the treatment. The study will characterize endometrial thickness before and after six months of treatment, providing insights into the effectiveness of these progesterone therapies for endometrial protection. The study is being conducted at Children's Hospital Colorado, where eligible patients will be recruited from various clinics.

Why it matters

Potential benefit: If successful, this study could help identify the most effective progesterone therapy for endometrial protection in young women undergoing hormone replacement therapy.

How similar studies have gone: While similar studies have explored hormone replacement therapies, this specific comparison of progesterone options in this age group is novel.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Age 12-25 years at baseline
* Female assigned at birth, with uterus
* Diagnosis of primary ovarian insufficiency or hypogonadotropic hypogonadism, requiring estrogen replacement therapy
* Receiving estradiol therapy-oral (1-2mg) or transdermal (0.05-0.1mg)-for at least 3 months
* Never used progesterone therapy or discontinued progesterone therapy at least 90-days prior to enrollment
* Consents to initiating progesterone therapy

Exclusion Criteria:

* Uterine abnormality (e.g., Müllerian Anomaly, uterine fibroids)
* Inability to characterize the endometrial lining on ultrasound
* History of chemotherapy or radiation therapy
* Inability to complete study questionnaire

Where it's running

  • Childrens Hospital Colorado
    Aurora, Colorado, United States
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.