Publications by authors named "Justine Defreyne"

While endocrinologists continue to initiate gender-affirming hormone therapy (GAHT) in healthy transgender and gender diverse (TGD) patients, they may also encounter more TGD patients in their clinics with complex medical histories that influence the patient-provider shared decision-making process for initiating or continuing GAHT. The purpose of this Approach to the Patient article is to describe management considerations in 2 adults with thromboembolic disease and 2 adults with low bone mineral density in the setting of feminizing and masculinizing GAHT.

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As the transgender and gender diverse (TGD) population ages, more transfeminine and transmasculine individuals present to clinic to initiate or continue their gender-affirming care at older ages. Currently available guidelines on gender-affirming care are excellent resources for the provision of gender-affirming hormone therapy (GAHT), primary care, surgery, and mental health care but are limited in their scope as to whether recommendations require tailoring to older TGD adults. Data that inform guideline-recommended management considerations, while informative and increasingly evidence-based, mainly come from studies of younger TGD populations.

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Introduction: Excess visceral fat increases the risk of type 2 diabetes and cardiovascular disease and is influenced by sex hormones. Our aim was to investigate changes in visceral fat and the ratio of visceral fat to total body fat (VAT/TBF) and their associations with changes in lipids and insulin resistance after 1 year of hormone therapy in trans persons.

Methods: In 179 trans women and 162 trans men, changes in total body and visceral fat estimated with dual-energy X-ray absorptiometry before and after 1 year of hormone therapy were related to lipids and insulin resistance [homeostatic model assessment of insulin resistance (HOMA-IR)] with linear regression analysis.

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Objective: To study the feasibility of in vitro maturation of ovarian tissue oocytes for fertility preservation in transgender men on testosterone treatment.

Design: Cross-sectional study SETTING: University hospital PATIENT(S): Eighty-three transgender men enrolled from November 2015 to January 2019 INTERVENTION(S): In vitro maturation of cumulus-oocyte complexes (COCs) harvested at the time of gender confirmation surgery, and fertilization through intracytoplasmic sperm injection.

Main Outcome Measure(s): In vitro maturation, fertilization, and blastulation rates; comparison of morphokinetics with vitrified-warmed oocytes; and analysis of the genetic profiles of embryos.

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Context: Individuals with gender dysphoria can receive gender-affirming hormone therapy. Different guidelines mention a severe risk of liver injury within the first months after the start of treatment with anabolic androgenic steroids, anti-androgens, and oral contraceptives, which is potentially fatal.

Objective: The incidence of liver injury in a transgender population using gender-affirming hormone therapy.

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Improving transgender people's quality of life (QoL) is the most important goal of gender-affirming care. Prospective changes in affect can influence QoL. We aim to assess the impact of initiating gender-affirming hormonal treatment (HT) on affect.

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Study Question: Does gender-affirming treatment prevent full spermatogenesis in transgender women (TW)?

Summary Answer: Adequate hormonal therapy (HT) leads to complete suppression of spermatogenesis in most TW, if serum testosterone levels within female reference ranges are obtained.

What Is Known Already: Gender-affirming treatment in transgender individuals may involve gender-affirming HT. The effects on spermatogenesis in TW remain unclear.

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Transgender people who chose to proceed with gender affirming hormonal and/or surgical therapy, may face reduced options for fulfilling their parental desire in the future. The ideas and concerns of adult transgender people regarding fertility preservation and parental desire have never been reported in a large, non-clinical sample of assigned male at birth (AMAB) transgender people. A web-based survey on fertility and parenthood in (binary and non-binary) transgender people was conducted in Belgium.

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Background: Previous studies have cross-sectionally described amenorrhea in cohorts of transgender men on intramuscular or subcutaneous testosterone injections. It remains uncertain which testosterone preparations most effectively suppress vaginal bleeding and when amenorrhea occurs after testosterone initiation.

Aim: To investigate the clinical effects of various testosterone preparations on vaginal bleeding and spotting in transgender men.

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Concerns have been raised about undesired estrogenic effects in assigned female at birth (AFAB) transgender people on testosterone therapy. How serum estradiol levels change after initiation of testosterone therapy and if these levels should be monitored remain unclear. This prospective cohort study was part of the European Network for the Investigation of Gender Incongruence.

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Introduction: Several steps in the transitioning process may affect sexual desire in transgender people. This is often underexposed by those providing gender-affirming care.

Aim: To prospectively assess sexual desire during the first 3 years of hormonal therapy (HT) in transgender people.

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Objective: The long-term influences of sex hormone administration on insulin sensitivity and incretin hormones are controversial. We investigated these effects in 35 transgender men (TM) and 55 transgender women (TW) from the European Network for the Investigation of Gender Incongruence (ENIGI) study.

Research Design And Methods: Before and after 1 year of gender-affirming hormone therapy, body composition and oral glucose tolerance tests (OGTTs) were evaluated.

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Objective: To study the considerations and concerns of transgender people regarding fertility preservation and parental desire in a large, nonclinical sample. Gender-affirming care can reduce fertility. Previous research on fertility in transgender people (mainly focused on people visiting health care professionals) shows low fertility preservation use.

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Transgender (trans) women (TW) were assigned male at birth but have a female gender identity or gender expression. The literature on management and health outcomes of TW has grown recently with more publication of research. This has coincided with increasing awareness of gender diversity as communities around the world identify and address health disparities among trans people.

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Research has shown that sexual risk behavior, as well as transition-related risk behavior, such as uncontrolled hormone use, auto-medication, and silicone injections, may lead to several adverse health outcomes for transgender persons. Transgender sex workers are a vulnerable group within the transgender population, who are at increased risk for these health risk behaviors. However, European research into this topic and risk population remains largely absent.

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The validated Transsexual Voice Questionnaire Male to Female (TVQ) and the adapted TVQ Female to Male (FtM) (TVQ) are both 30-item-long questionnaires used to evaluate self-perception of voice in transgender persons. They are part of a series of questionnaires completed by transgender persons during follow-up of cross-sex hormone therapy (CSHT). The aim of this study was to examine if these questionnaires can be organized.

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Transmasculine Hormone Therapy.

Endocrinol Metab Clin North Am

June 2019

Prescribing gender-affirming hormonal therapy in transgender men (TM) not only induces desirable physical effects but also benefits mental health. In TM, testosterone therapy is aimed at achieving cisgender male serum testosterone to induce virilization. Testosterone therapy is safe on the short term and middle term if adequate endocrinological follow-up is provided.

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Introduction: Anger is a state of emotions ranging from irritation to intense rage. Aggression implies externalizing anger through destructive/punitive behaviour. The World Professional Association for Transgender Health (WPATH) Standards of Care, Edition 7 (SOC7) guidelines warn about aggression in transgender men (TM) on testosterone treatment.

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Background: Gender-affirming hormonal therapy consists of testosterone in transgender men and estrogens and antiandrogens in transgender women. Research has concluded that gender-affirming therapy generally leads to high satisfaction rates, increased quality of life, and higher psychological well-being. However, given the higher incidence of cardiometabolic morbidity and mortality in cisgender men compared with cisgender women, concerns about the cardiometabolic risk of androgen therapy have been raised.

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Context: The impact of gender-affirming hormone therapy (HT) on cardiometabolic parameters is largely unknown.

Objective: The effects of 1 year of treatment with oral or transdermal administration of estrogen (plus cyproterone) and transdermal or IM application of testosterone on serum lipid levels and blood pressure (BP) were assessed in transgender persons.

Design And Methods: In this prospective, observational substudy of the European Network for the Investigation of Gender Incongruence, measurements were performed before and after 12 months of HT in 242 transwomen and 188 transmen from 2010 to 2017.

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Background: Although research on the relation between testosterone and aggression in humans is inconclusive, guidelines (including the World Professional Association for Transgender Health Standards of Care, edition 7) have warned for an increase in aggression in transgender men taking testosterone treatment.

Aims: To investigate the association between levels of testosterone and aggression in treatment-seeking transgender people and explore the role of mental health psychopathology (anxiety and depressive symptoms) and social support in aggression in this population.

Methods: Every transgender person invited for assessment at a national transgender health clinic in the United Kingdom during a 3-year period (2012-2015) completed self-report measures for interpersonal problems, including levels of aggression (Inventory of Interpersonal Problems [IIP-32]), symptoms of anxiety and depression (Hospital Anxiety and Depression Scale [HADS]), social support (Multidimensional Scale of Perceived Social Support), and experiences of transphobia before and 1 year after the initiation of gender-affirming hormonal therapy.

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Context: Hormonal treatment in transgender persons affects many components of the metabolic syndrome (MS).

Objective: To determine the role of direct hormonal effects, changes in metabolic cytokines, and body composition on metabolic outcomes.

Design, Setting, And Participants: 24 transwomen and 45 transmen from the European Network for the Investigation of Gender Incongruence were investigated at baseline and after 12 months of hormonal therapy.

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Options for gender affirming therapy in trans men include social transitioning, mental coaching, hormonal therapy and gender affirming surgery. Research has concluded that gender affirming therapy is safe and feasible and generally leads to high satisfaction rates. However, research regarding the cost-effectiveness is scarce.

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Purpose: Hormone treatment in trans women in Europe usually consists of the administration of estrogens and antiandrogens, for example, cyproterone acetate (CPA). Mild serum prolactin elevations during follow-up are attributed to estrogen therapy. This analysis evaluates whether CPA contributes to the elevation of prolactin in trans women receiving gender affirming hormones.

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