Clinical trial Recruiting at 1 site Observational Ages 16 and up Women only

How hormones and mastectomy affect chest-related feelings in trans men and gender-diverse people

Official title: The Effect of Gender-affirmative Measures on Breast Perception in Trans Men (TRANSBREAST) - a Prospective Cohort Study

Run by Medical University Innsbruck · NCT07252687 · Data updated 2026-11-12

This study will see if gender-affirming hormone therapy and mastectomy change breast-related distress and quality of life in trans men and gender-diverse people before they start treatment.

More Transgender trials

Quick facts

Study typeObservational
Ages16 Years and up
SexWomen only
Enrollment100 (estimated)
SponsorMedical University Innsbruck
Academic / other
Locations1 site (Innsbruck)
StatusRecruiting
StartedNovember 30, 2025
Main results expectedNovember 2030
Study endsNovember 2030
Registry record updatedMarch 6, 2026
Trial IDNCT07252687 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

AFAB people who identify as trans men or gender-diverse with breast dysphoria who have not yet started GAHT or had mastectomy, can consent, and understand German.

Probably not a fit

People already receiving GAHT, who have had mastectomy, who cannot give informed consent, or who do not speak German are not expected to benefit from participating.

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 follows AFAB individuals who identify as trans men or gender-diverse before they begin gender-affirming hormone therapy (GAHT) or undergo mastectomy, using the iTransQoL and a chest dysphoria questionnaire to measure outcomes. The primary aim is to analyze psychological and physical effects of breast development on chest dysphoria and related quality of life. A secondary aim is to compare how coping strategies such as binding versus taping relate to stress and well-being. Participants must be German-speaking, able to give informed consent, and attend visits at the Medical University of Innsbruck.

Why it matters

Potential benefit: If successful, the results could help clinicians and patients choose timing and support strategies to reduce breast-related distress and improve mental health.

How similar studies have gone: Prior studies show GAHT and mastectomy often reduce gender dysphoria and improve mental health, but systematic data specifically on breast dysphoria and coping methods like binding versus taping is limited.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* AFAB (Assigned Female At Birth)
* before starting GAHT
* before mastectomy

Exclusion Criteria:

* Ongoing GAHT
* Mastectomy already performed
* Lack of capacity to give consent
* Insufficient knowledge of German

Where it's running

  • Medical University Innsbruck
    Innsbruck, Austria
    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.