Subcutaneous Injection of Testosterone Is an Effective and Preferred Alternative to Intramuscular Injection: Demonstration in Female-to-Male Transgender Patients

Serum Hormone Concentrations in Transgender Youth Receiving Estradiol

OBJECTIVE

This study aimed to evaluate the serum estradiol levels in gender-diverse youth to compare the efficacy of different estradiol routes in achieving therapeutic blood levels and suppressing serum testosterone levels.

METHODS

This was a retrospective chart review of patients who initiated estradiol at an adolescent gender clinic between 2010 and 2019. Data on the route of estradiol administration and antiandrogen use (spironolactone or gonadotropin-releasing hormone agonist) were collected, and laboratory data were analyzed. Scatterplots were used to visualize the relationship between the estradiol dose and testosterone and estradiol laboratory values.

RESULTS

A total of 118 patients were included, with a mean (standard deviation [SD]) age of 17.2 (1.6) years. The most common route of estradiol administration was oral only (62.7%), followed by transdermal only (23.7%), multiple routes excluding subcutaneous (8.5%), and any subcutaneous (5.1%). Notable variability was observed in the serum estradiol levels, with means (SDs) of 131.9 (120.4) pg/mL for those on oral estrogen 6 to 8 mg per day, 62.6 (40.3) pg/mL for those on transdermal estrogen 0.1 to 0.15 mg every 24 hours, and 53.6 (42.4) pg/mL for those on subcutaneous estradiol. In patients who received spironolactone, transdermal estradiol was associated with lower testosterone levels than estradiol administered orally or subcutaneously.

CONCLUSION

Oral, transdermal, and subcutaneous administrations of estrogen all lead to increased serum estradiol levels and are effective for use in gender-affirming care for youth. Patients on transdermal estrogen tended to have lower serum estradiol levels but also had more suppression of serum testosterone levels.

A prospective comparison study of subcutaneous and intramuscular testosterone injections in transgender male adolescents

OBJECTIVES

This prospective study compares testosterone injection type and effects on biochemical changes, clinical effects, and quality of life amongst transgender and gender diverse (TGD) adolescents assigned female at birth (AFAB) over the first 6 months of subcutaneous (SQ) vs. intramuscular (IM) testosterone injections as part of their gender affirming care.

METHODS

Subjects were testosterone-naïve transgender adolescents, AFAB, ages 14-18 years old. Subjects were either randomized to injection type or selected a preferred injection type. At enrollment, subjects completed baseline labs and PedsQL™ quality of life questionnaire. At 3 month and 6 month follow up, subjects completed peak and trough testosterone levels, PedsQL™, masculinizing effects, and medication experience questionnaires.

RESULTS

Twenty-six subjects participated with a median age 15.5 years. By 6-month follow up, trough testosterone levels were comparable between the two groups. Peak testosterone levels were higher in the IM group at 3-month follow up. Mild adverse effects were rare (12 %, all in SQ subjects) and limited to skin reaction only. Self-reported masculinization effects and quality of life were not statistically different between injection groups. A total of 92 % of participants was self-injecting by 3-month follow up.

CONCLUSIONS

In this prospective study, clinical and biochemical effects are similar between SQ and IM testosterone injections for transgender adolescents. Subjects expressed preference for both injection types. Both SQ and IM injection modalities are safe and effective for TGD youth initiating testosterone and both options should be offered to patients.

Gender-affirming pharmacotherapy and additional health considerations: A contemporary review

BACKGROUND

Transgender and gender-diverse (TGD) individuals in the United States face health care disparities compounded with discrimination and limited access to necessary medical services. Gender-affirming interventions have been shown to mitigate gender dysphoria and psychiatric comorbidities, yet United States legislation limiting such interventions has increased. As medication experts, pharmacists can facilitate access to care and appropriate use of gender-affirming hormone therapy (GAHT) and educate other health care providers on best practices for caring for TGD individuals in a variety of settings.

OBJECTIVES

To provide pharmacists with a contemporary review of GAHT and associated medication-related concerns.

METHODS

We searched PubMed for articles published until December 2022. MeSH terms such as transgender, transsexual, gender diverse, gender variant, or gender nonconforming in combination with phrases like gender-affirming care, treatment, pharmacotherapy, or hormone therapy were used to capture desired articles.

RESULTS

Feminizing hormone therapy (FHT), such as estrogen and antiandrogen agents, increases female secondary sex characteristics while suppressing male secondary sex characteristics. Masculinizing hormone therapy (MHT) achieves male secondary sex characteristics and minimizes female secondary sex characteristics using testosterone. For both FHT and MHT, the choice of therapy and formulation ultimately involves the patient's treatment goals, preferences, and tolerability. GAHT has additional health considerations pertaining to renal drug dosing, fertility, cardiovascular, and cancer risks. Pharmacists may provide crucial guidance and education to both patients and health care providers regarding risks associated with GAHT.

CONCLUSION

Many pharmacists feel unprepared to help provide, manage, and optimize GAHT. For many TGD individuals, GAHT is medically necessary and a life-saving treatment. Therefore, pharmacists should be provided tools to close knowledge gaps and improve their ability to care for these patients. By offering a thorough updated overview of GAHT, pharmacists can gain confidence to provide appropriate care for this increasingly visible population.

A Mouse Model to Investigate the Impact of Gender Affirming Hormone Therapy with Estradiol on Reproduction

Gender-affirming hormone therapy (GAHT) can help transgender and/or gender diverse (TGD) individuals achieve emobidment goals that align with their transition needs. Clinical evidence from estradiol (E)-GAHT patients indicate widespread changes in tissues sensitive to E and testosterone (T), particularly in the reproductive system. Notably, E-GAHTs effects on hormones and reproduction vary greatly between patients. With the goal of informing clinical research and practice for TGD individuals taking E, this study examines intact male mice implanted with capsules containing one of three different E doses (low 1.25 mg; mid 2.5 mg; high 5 mg), or a blank control capsule. All E-GAHT doses suppress T and follicle stimulating hormone levels while elevating E levels. Only the high E-GAHT dose significantly supresses luteinizing hormone levels. All E-GAHT doses affect epididymis tubule size similarly while seminiferous tubule morphology and bladder weight changes are dose-dependent. E-GAHT does not alter the presence of mature sperm, though E-exposed sperm have altered motility. These data represent the first evidence that mouse models offer an effective tool to understand E-GAHTs impact on reproductive health and the dose-dependent effects of this model permit examinations of diverse patient outcomes.

Comparison of Subcutaneous and Intramuscular Estradiol Regimens as part of Gender-Affirming Hormone Therapy

OBJECTIVE

Gender-affirming hormone therapy (GAHT) guidelines describe estradiol doses for intramuscular (IM), but not subcutaneous (SC) routes. Objective was to compare SC and IM estradiol doses and hormone concentrations in transgender and gender diverse (TGD) individuals.

METHODS

Retrospective cohort study at a single site tertiary care referral center. Patients were TGD individuals receiving injectable estradiol with at least 2 estradiol measurements. Main outcomes were median doses and achieved serum hormone concentrations between SC and IM routes.

RESULTS

There was no statistical difference in age, BMI or anti-androgen use between patients on SC estradiol (n = 74) vs IM estradiol (n = 56). Median weekly doses of SC estradiol, 3.75 mg [IQR 3-4 mg] were statistically significantly lower than IM estradiol, 4 mg [IQR 3-5.15 mg] (p = 0.005), but estradiol concentrations achieved by both groups were not significantly different, (p = 0.69) and median testosterone concentrations were in the cisgender female range and were not significantly different between routes (p = 0.92). Subgroup analysis demonstrated significantly higher doses in the IM group when estradiol > 100 pg/mL, testosterone < 50 ng/dL, with gonads present, or use of anti-androgens. Multiple Regression Analysis demonstrated that estradiol dose was significantly associated with estradiol concentrations after adjusting for injection route, BMI, anti-androgen use, and gonadectomy status.

CONCLUSIONS

Both SC and IM estradiol GAHT achieve therapeutic estradiol concentrations without a meaningful difference in estradiol dose (3.75 vs 4 mg). SC use may require lower doses than IM to achieve therapeutic concentrations.

IDEA Group Consensus Statement on Medical Management of Adult Gender Incongruent Individuals Seeking Gender Affirmation as Male

Gender-affirming hormone therapy (GAHT) is the most frequent treatment offered to gender-incongruent individuals, which reduces dysphoria. The goal of therapy among gender-incongruent individuals seeking gender affirmation as male is to change their secondary sex characteristics to affect masculine physical appearances. GAHT greatly improves mental health and quality of life among gender incongruent individuals. India-specific guideline for appropriate care for gender-incongruent individuals is almost absent. This document is intended to assist endocrinologists and other healthcare professionals interested in gender incongruity for individuals seeking gender affirmation as male. A safe and effective GAHT regimen aims to effect masculinising physical features without adverse effects. In this document, we offer suggestions based on an in-depth review of national and international guidelines, recently available evidence and collegial meetings with expert Indian clinicians working in this field. Clinicians represented in our expert panel have developed expertise due to the volume of gender incongruent individuals they manage. This consensus statement provides protocols for the hormone prescribing physicians relating to diagnosis, baseline evaluation and counselling, prescription planning for masculinising hormone therapy, choice of therapy, targets for monitoring masculinising hormone therapy, clinical and biochemical monitoring, recommending sex affirmation surgery and peri-operative hormone therapy. The recommendations made in this document are not rigid guidelines, and the hormone-prescribing physicians are encouraged to modify the suggested protocol to address emerging issues.

New and Consolidated Therapeutic Options for Pubertal Induction in Hypogonadism: In-depth Review of the Literature

Delayed puberty (DP) defines a retardation of onset/progression of sexual maturation beyond the expected age from either a lack/delay of the hypothalamo-pituitary-gonadal axis activation or a gonadal failure. DP usually gives rise to concern and uncertainty in patients and their families, potentially affecting their immediate psychosocial well-being and also creating longer term psychosexual sequelae. The most frequent form of DP in younger teenagers is self-limiting and may not need any intervention. Conversely, DP from hypogonadism requires prompt and specific treatment that we summarize in this review. Hormone therapy primarily targets genital maturation, development of secondary sexual characteristics, and the achievement of target height in line with genetic potential, but other key standards of care include body composition and bone mass. Finally, pubertal induction should promote psychosexual development and mitigate both short- and long-term impairments comprising low self-esteem, social withdrawal, depression, and psychosexual difficulties. Different therapeutic options for pubertal induction have been described for both males and females, but we lack the necessary larger randomized trials to define the best approaches for both sexes. We provide an in-depth and updated literature review regarding therapeutic options for inducing puberty in males and females, particularly focusing on recent therapeutic refinements that better encompass the heterogeneity of this population, and underlining key differences in therapeutic timing and goals. We also highlight persistent shortcomings in clinical practice, wherein strategies directed at "the child with delayed puberty of uncertain etiology" risk being misapplied to older adolescents likely to have permanent hypogonadism.

The role of androgens in transgender medicine

Androgen therapy is the mainstay of treatment in female to male (FtM) transgender persons to increase testosterone levels, suppress oestrogens and treat gender dysphoria. Testosterone is widely used for male hypogonadism, but is comparatively under-investigated in FtM transgender persons. The aim of our study was to identify treatment and safety outcomes associated with testosterone use in transgender medicine. Androgens in FtM transgender persons are effective to lower voice frequency, increase facial hair-growth, and increase hematocrit and hemoglobin levels to adult male reference ranges. A 1.2-fold-3.7-fold higher rate of myocardial infarction has been reported retrospectively, compared to cisgender women. Blood pressure, glycaemic control and body mass index remained unchanged in FtM transgender persons. Androgens in FtM transgender persons have important cardio-metabolic implications. Randomised control trials, longer follow-up periods and studies involving older persons may further improve the management of FtM transgender persons.

Experiences with Menses in Transgender and Gender Nonbinary Adolescents

STUDY OBJECTIVE

To describe menstrual history, associated dysphoria, and desire for menstrual management in transgender male and gender diverse adolescents who were assigned female at birth DESIGN: Retrospective chart review SETTING: Tertiary care children's hospital PARTICIPANTS: All patients seen in a multidisciplinary pediatric gender program from March 2015 through December 2020 who were assigned female at birth, identified as transgender male or gender nonbinary, and had achieved menarche INTERVENTION: None MAIN OUTCOME MEASURES: Patient demographics, menstrual history, interest in and prior experiences with menstrual management, parental support, and concerns about menstrual management RESULTS: Of the 129 included patients, 116 (90%) identified as transgender male and 13 (10%) as gender nonbinary, with an average age of 15 (SD 1.6) years. Almost all (93%) patients reported menstrual-related dysphoria. Most (88%) were interested in menstrual suppression. The most common reasons for desiring suppression were achievement of amenorrhea (97%) and improvement of menstrual-related dysphoria (63%).

CONCLUSIONS

Most gender diverse patients assigned female at birth reported dysphoria associated with menses and desired menstrual suppression. This information can encourage physicians to raise this topic and offer menstrual management for gender diverse patients who experience distress related to menses, especially for those who are not ready for or do not desire gender-affirming hormonal treatment. Future research is needed to better understand patients' experiences with menses and to determine the optimal menstrual management methods. This could be an important intervention to improve outcomes for this vulnerable population.

An Approach to the Patient With Delayed Puberty

Pediatric endocrinologists often evaluate and treat youth with delayed puberty. Stereotypically, these patients are 14-year-old young men who present due to lack of pubertal development. Concerns about stature are often present, arising from gradual shifts to lower height percentiles on the population-based, cross-sectional curves. Fathers and/or mothers may have also experienced later than average pubertal onset. In this review, we will discuss a practical clinical approach to the evaluation and management of youth with delayed puberty, including the differential diagnosis and key aspects of evaluation and management informed by recent review of the existing literature. We will also discuss scenarios that pose additional clinical challenges, including: (1) the young woman whose case poses questions regarding how presentation and approach differs for females vs males; (2) the 14-year-old female or 16-year-old young man who highlight the need to reconsider the most likely diagnoses, including whether idiopathic delayed puberty can still be considered constitutional delay of growth and puberty at such late ages; and finally (3) the 12- to 13-year-old whose presentation raises questions about whether age cutoffs for the diagnosis and treatment of delayed puberty should be adjusted downward to coincide with the earlier onset of puberty in the general population.

Gender-affirming hormone therapy: An updated literature review with an eye on the future

In line with increasing numbers of transgender (trans) and gender nonbinary people requesting hormone treatment, the body of available research is expanding. More clinical research groups are presenting data, and the numbers of participants in these studies are rising. Many previous review papers have focused on all available data, as these were scarce, but a more recent literature review is timely. Hormonal regimens have changed over time, and older data may be less relevant for today's practice. In recent literature, we have found that even though mental health problems are more prevalent in trans people compared to cisgender people, less psychological difficulties occur, and life satisfaction increases with gender-affirming hormone treatment (GAHT) for those who feel this is a necessity. With GAHT, body composition and contours change towards the affirmed sex. Studies in bone health are reassuring, but special attention is needed for adolescent and adult trans women, aiming at adequate dosage of hormonal supplementation and stimulating therapy compliance. Existing epidemiological data suggest that the use of (certain) estrogens in trans women induces an increased risk of myocardial infarction and stroke, the reason that lifestyle management can be an integral part of trans health care. The observed cancer risk in trans people does not exceed the known cancer-risk differences between men and women. Now it is time to integrate the mostly reassuring data, to leave the overly cautious approach behind, to not copy the same research questions repeatedly, and to focus on longer follow-up data with larger cohorts.

Prevalence of comorbidities and concomitant medication use in acromegaly: analysis of real-world data from the United States

PURPOSE

Patients receiving treatment for acromegaly often experience significant associated comorbidities for which they are prescribed additional medications. We aimed to determine the real-world prevalence of comorbidities and concomitant medications in patients with acromegaly, and to investigate the association between frequency of comorbidities and number of concomitantly prescribed medications.

METHODS

Administrative claims data were obtained from the IBM® MarketScan® database for a cohort of patients with acromegaly, identified by relevant diagnosis codes and acromegaly treatments, and a matched control cohort of patients without acromegaly from January 2010 through April 2020. Comorbidities were identified based on relevant claims and assessed for both cohorts.

RESULTS

Overall, 1175 patients with acromegaly and 5875 matched patients without acromegaly were included. Patients with acromegaly had significantly more comorbidities and were prescribed concomitant medications more so than patients without acromegaly. In the acromegaly and control cohorts, respectively, 67.6% and 48.4% of patients had cardiovascular disorders, the most prevalent comorbidities, and 89.0% and 68.3% were prescribed > 3 concomitant medications (p < 0.0001). Hypopituitarism and hypothalamic disorders, sleep apnea, malignant neoplasms and cancer, and arthritis and musculoskeletal disorders were also highly prevalent in the acromegaly cohort. A moderate, positive correlation (Spearman correlation coefficient 0.60) was found between number of comorbidities and number of concomitant medications in the acromegaly cohort.

CONCLUSION

Compared with patients without acromegaly, patients with acromegaly have significantly more comorbidities and are prescribed significantly more concomitant medications. Physicians should consider the number and type of ongoing medications for individual patients before prescribing additional acromegaly treatments.

Navigating Human Immunodeficiency Virus and Primary Care Concerns Specific to the Transgender and Gender-Nonbinary Population

Human immunodeficiency virus (HIV) prevention and treatment remain critically important to outpatient care among transgender and gender-nonbinary individuals. Epidemiologically, trans men and trans women are significantly more likely to have HIV compared with all adults of reproductive age. Here, we provide an overview of unique primary care considerations affecting transgender and gender-nonbinary individuals, including screening and treatment of HIV and other sexually transmitted infections as well as cancer screening and fertility preservation options. We also seek to review current literature and clinical practice guidelines related to drug–drug interactions between antiretroviral therapy (ART) and gender-affirming hormonal therapy (GAHT). In short, integrase strand transfer inhibitor–based therapy is not expected to have significant drug interactions with most GAHT and is preferred in most transgender individuals, including those on GAHT. Clinicians should also remain aware of current GAHT regimens and consider tailoring ART and GAHT to reduce cardiovascular and other risk factors.

An introduction to gender-affirming hormone therapy for transgender and gender-nonbinary patients

ABSTRACT

Transgender and gender-nonbinary patients may present to primary care providers seeking gender-affirming hormone therapy. Patients who meet criteria for diagnosis of gender incongruence may start or continue hormone therapy after providing informed consent. Prescribing and monitoring of masculinizing and feminizing hormone therapy can be managed in primary care settings.

Testosterone Therapy With Subcutaneous Injections: A Safe, Practical, and Reasonable Option

CONTEXT

Injections with intramuscular (IM) testosterone esters have been available for almost 8 decades and not only result in predictable serum testosterone levels but are also the most inexpensive modality. However, they are difficult to self-administer and associated with some discomfort. Recently, subcutaneous (SC) administration of testosterone esters has gained popularity, as self-administration is easier with this route. Available data, though limited, support the feasibility of this route. Here we review the pharmacokinetics and safety of SC testosterone therapy with both long- and ultralong-acting testosterone esters. In addition, we provide guidance for clinicians on how to counsel and manage their patients who opt for the SC route.

EVIDENCE ACQUISITION

Systematic review of available literature on SC testosterone administration including clinical trials, case series, and case reports. We also review the pharmacology of testosterone absorption after SC administration.

EVIDENCE SYNTHESIS

Available evidence, though limited, suggests that SC testosterone therapy in doses similar to those given via IM route results in comparable pharmacokinetics and mean serum testosterone levels. With appropriate training, patients should be able to safely self-administer testosterone esters SC with relative ease and less discomfort compared with the IM route.

CONCLUSION

Although studies directly comparing the safety of SC vs IM administration of testosterone esters are desirable, clinicians should consider discussing the SC route with their patients because it is easier to self-administer and has the potential to improve patient adherence.

Society for Endocrinology guidelines for testosterone replacement therapy in male hypogonadism

Male hypogonadism (MH) is a common endocrine disorder. However, uncertainties and variations in its diagnosis and management exist. There are several current guidelines on testosterone replacement therapy that have been driven predominantly by single disciplines. The Society for Endocrinology commissioned this new guideline to provide all care providers with a multidisciplinary approach to treating patients with MH. This guideline has been compiled using expertise from endocrine (medical and nursing), primary care, clinical biochemistry, urology and reproductive medicine practices. These guidelines also provide a patient perspective to help clinicians best manage MH.

Subcutaneous Testosterone Is Effective and Safe as Gender-Affirming Hormone Therapy in Transmasculine and Gender-Diverse Adolescents and Young Adults: A Single Center's 8-Year Experience

Purpose: To describe our Center's 8-year experience with subcutaneous testosterone (SC-T) as gender-affirming hormone therapy (GAHT) in transmasculine and gender-diverse (TM/GD) youth.

Methods: An Institutional Review Board (IRB)-approved retrospective study for 119 TM/GD subjects who started SC-T at age 13–19 and received SC-T for >6 months between 2012 and 2020.

Results: SC-T was typically started at 25–50 mg biweekly and dose was escalated at provider's discretion. Over 96% of subjects were on 100–320 mg monthly (divided weekly or biweekly) at last follow-up. There was an overall increase in mean total and free testosterone (T) over the dose range (p=0.003), with mean total and free T levels of 460 ng/dL and 92 pg/mL, respectively, at a monthly SC-T dose of 200 mg. For subjects on SC-T without additional menstrual suppression, 54% had cessation of menses at 140 mg monthly and 97% at 200 mg monthly. On average, menses stopped 4.7 (standard deviation 3.0) months after starting SC-T. There was a decrease in high-density lipoprotein and increase in hematocrit from baseline to follow-up. Body mass index Z-scores did not change significantly with treatment. Mild acne was common; severe acne and significant injection site reactions were uncommon. Sustained hypertension, transaminitis, and dyslipidemia were infrequent.

Conclusions: SC-T is well tolerated and effective in reaching recommended T levels and stopping menses in TM/GD youth. Occurrence of serious adverse effects is low and inability to tolerate injections is very uncommon. SC-T is a safe and effective alternative to intramuscular testosterone in initiation and maintenance of GAHT in TM/GD youth.

Teaching transgender patient care to student pharmacists

INTRODUCTION

This study describes content on transgender care taught in a doctor of pharmacy (PharmD) course and evaluates students' confidence and knowledge of providing care for transgender people. It also examines what pharmacy students want to learn about providing care to transgender people.

METHODS

Three hours of transgender patient care content was integrated into a pharmacy course that focused on therapeutics of special populations. Students completed an electronic survey before and after the class sessions to identify changes in their confidence in caring for transgender patients. The pre-class survey inquired about what the students were hoping to learn. The post-class survey asked students what was missing from this session that they would have liked to learn. Knowledge regarding transgender care was assessed through a multiple-choice examination.

RESULTS

Students reported interest in improving communication skills, learning terminology/vocabulary preferred by transgender people, and understanding population-specific challenges faced by transgender patients. Students reported they would have liked additional information about the transition, being transgender, and local resources available. Student confidence in asking about patient pronouns and counseling on effects of medications for gender transition were both significantly increased from the pre-class survey to post-class survey. Students demonstrated proficiency toward the learning objectives, with a 92.4% average on the examination questions on transgender care.

CONCLUSIONS

Student pharmacists are interested in learning skills to provide care to transgender patients. A learning session on transgender patient care integrated into a PharmD curriculum increased student knowledge and confidence in caring for transgender patients.

The Intrauterine Device Experience Among Transgender and Gender-Diverse Individuals Assigned Female at Birth

INTRODUCTION

The intrauterine device (IUD) is a long-acting and highly efficacious form of contraception that can also be used for menstrual suppression. Although IUD use is increasing, the type chosen, appeal, and satisfaction among individuals who are transgender and gender diverse and assigned female at birth (TGD-AFAB) is unknown. The purpose of this study is to evaluate IUD usage among TGD-AFAB individuals.

METHODS

TGD-AFAB individuals who had an IUD for a minimum of 6 months at the time of completing the survey or had one in the past completed an anonymous online survey. Descriptive statistics were used to analyze the data.

RESULTS

One hundred and five TGD-AFAB individuals completed the survey. Among participants who were sexually active, 88% reported they were in a relationship in which it was possible to get pregnant. There were 85 individuals who currently had an IUD: 62 (73%) chose a 52-mg levonorgestrel (LNG) IUD, 5 (6%) chose a lower-dose LNG IUD, 17 (20%) chose the copper IUD, and one chose an IUD unavailable in the United States. Menstrual suppression was the primary reason for choosing a 52-mg LNG IUD (58%). Most individuals who opted for a copper IUD did so to avoid hormonal contraception (71%). Participants reported experiencing IUD side effects; however, few desired removal. Among the 36 respondents who had an IUD in the past, the most frequent reasons for removal were expiration of the device (LNG IUDs) and undesired side effects (copper IUD). Approximately half of participants who had an IUD removed had it replaced with another IUD.

DISCUSSION

Pregnancy can occur among TGD-AFAB individuals even if they are on testosterone and amenorrheic. IUDs are well tolerated in this population, with few current users desiring removal for unwanted side effects. Clinicians should counsel TGD-AFAB individuals about the contraceptive and noncontraceptive benefits of IUDs and expected side effects.

Restoration of Reproductive Hormone Concentrations in a Male Neutered Dog Improves Health: A Case Study

This case study reports on the use of hormone therapy to treat a dog with a range of physical and behavioral signs that began after gonadectomy. A male mixed breed dog neutered at 7 months of age presented at 1 year with health issues impacting quality of life. Reduced mobility, limping, rapid weight gain, and fear of unfamiliar people were treated over the next 3 years with trials of pain medication, joint supplements, thyroxine, antidepressant, and significant diet restrictions. Frequent carprofen administration and daily joint supplements reduced limping, but mobility was still poor. Weight stabilized on a strict diet but fear and anxiety responses to strangers continued to worsen. Hormone restoration therapy was initiated when the dog was almost 4 years of age. Weekly subcutaneous administration of testosterone cypionate (0.5 mg/kg) significantly reduced pain and increased muscle mass, thereby improving mobility. However, supraphysiologic concentrations of luteinizing hormone were not reduced with testosterone therapy so a gonadotropin-releasing hormone agonist was implanted. After hormone restoration, appetite was reduced, and anxiety and fear behaviors became manageable. The testosterone and gonadotropin-releasing hormone agonist treatment was easily administered, had no known side effects, and the owners were pleased with the outcome.

Androgen Treatment in Adolescent Males With Hypogonadism

During adolescence, androgens are responsible for the development of secondary sexual characteristics, pubertal growth, and the anabolic effects on bone and muscle mass. Testosterone is the most abundant testicular androgen, but some effects are mediated by its conversion to the more potent androgen dihydrotestosterone (DHT) or to estradiol. Androgen deficiency, requiring replacement therapy, may occur due to a primary testicular failure or secondary to a hypothalamic–pituitary disorder. A very frequent condition characterized by a late activation of the gonadal axis that may also need androgen treatment is constitutional delay of puberty. Of the several testosterone or DHT formulations commercially available, very few are employed, and none is marketed for its use in adolescents. The most frequently used androgen therapy is based on the intramuscular administration of testosterone enanthate or cypionate every 3 to 4 weeks, with initially low doses. These are progressively increased during several months or years, in order to mimic the physiology of puberty, until adult doses are attained. Scarce experience exists with oral or transdermal formulations. Preparations containing DHT, which are not widely available, are preferred in specific conditions. Oxandrolone, a non-aromatizable drug with higher anabolic than androgenic effects, has been used in adolescents with preserved testosterone production, like Klinefelter syndrome, with positive effects on cardiometabolic health and visual, motor, and psychosocial functions. The usual protocols applied for androgen therapy in boys and adolescents are discussed.

Efficacy of Sex Steroid Therapy Without Progestin or GnRH Agonist for Gonadal Suppression in Adult Transgender Patients

CONTEXT

Testosterone (T) or estradiol (E2) are administered to suppress gonadal function in female-to-male (FTM) and male-to-female (MTF) transgender patients. How often sex steroids cause adequate suppression without GnRH agonist (GnRHa) or progestin therapy has not been reported.

OBJECTIVES

(1) To determine how often T and E2 therapy alone can effectively suppress gonadal function in MTF and FTM transgender patients, and (2) to determine the frequency and range of serum E2 levels above the normal male range in FTM patients receiving T therapy.

DESIGN

Retrospective cohort study.

SETTING

Outpatient reproductive endocrinology clinic at an academic medical center.

PATIENTS

A total of 65 FTM and 33 MTF patients were included who were > 18 years of age and not receiving progestin or GnRHa therapy.

INTERVENTION

Female-to-male patients were receiving T through injections or gel. Male-to-female patients were receiving oral or subcutaneous E2.

MAIN OUTCOME MEASUREMENTS

In FTM patients the indicator of ovary suppression was amenorrhea. In MTF patients, the indicator of testes suppression was T levels <50 ng/dL.

RESULTS

Median serum total T level for FTM patients was 712 ng/dL (range, 370-1164 ng/dL). On T therapy alone, 90.8% of patients achieved amenorrhea and 49.2% of patients had serum E2 levels above the normal range for women. For MTF patients, the median serum E2 level was 129.2 pg/mL (range, 75-197 pg/mL). On E2 therapy alone, 84.8% of MTF patients had adequate suppression of testicular function.

CONCLUSIONS

Testosterone and E2 therapy are usually effective without progestin or GnRHa therapy to suppress gonadal function in transgender patients. Progestin and/or GnRHa therapy should only be initiated in those patients who do not have adequate gonadal suppression on optimized doses of T or E2 alone.

Research gaps in medical treatment of transgender/nonbinary people

With the growing number of transgender and gender-nonbinary individuals who are becoming visible, it is clear that there is a need to develop a rigorous evidence base to inform care practice. Transgender health research is often limited to HIV/AIDS or mental health research and is typically subsumed in larger studies with general LGBTQ focus. Although the number of knowledgeable health care providers remains modest, the model for the medical approach to transgender health is shifting owing to growing social awareness and an appreciation of a biological component. Gender-affirming medicine facilitates aligning the body of the transgender person with the gender identity; typical treatment regimens include hormone therapy and/or surgical interventions. While broadly safe, hormone treatments require some monitoring for safety. Exogenous estrogens are associated with a dose-dependent increase in venous thromboembolic risk, and androgens stimulate erythropoiesis. The degree to which progressing gender-affirming hormone treatment changes cancer risk, cardiac heart disease risk, and/or bone health remains unknown. Guidelines referencing the potential exacerbation of cancer, heart disease, or other disease risk often rely on physiology models, because conclusive clinical data do not exist. Dedicated research infrastructure and funding are needed to address the knowledge gap in the field.

Neurobiology of puberty and its disorders

Puberty, which in humans is considered to include both gonadarche and adrenarche, is the period of becoming capable of reproducing sexually and is recognized by maturation of the gonads and development of secondary sex characteristics. Gonadarche referring to growth and maturation of the gonads is fundamental to puberty since it encompasses increased gonadal steroid secretion and initiation of gametogenesis resulting from enhanced pituitary gonadotropin secretion, triggered in turn by robust pulsatile GnRH release from the hypothalamus. This chapter reviews the development of GnRH pulsatility from before birth until the onset of puberty. In humans, GnRH pulse generation is restrained during childhood and juvenile development. This prepubertal hiatus in hypothalamic activity is considered to result from a neurobiological brake imposed upon the GnRH pulse generator resident in the infundibular nucleus. Reactivation of the GnRH pulse generator initiates pubertal development. Current understanding of the genetics and physiology of the brake will be discussed, as will hypotheses proposed to account for timing the resurgence in pulsatile GnRH and initiation of puberty. The chapter ends with a discussion of disorders associated with precocious or delayed puberty with a focus on those with etiologies attributed to aberrant GnRH neuron anatomy or function. A pediatric approach to patients with pubertal disorders is provided and contemporary treatments for both precocious and delayed puberty outlined.

Testosterone Use in Adolescent Males: Current Practice and Unmet Needs

Testosterone replacement therapy (TRT) is routinely prescribed in adolescent males with constitutional delay of growth and puberty (CDGP) or hypogonadism. With many new testosterone (T) formulations entering the market targeted for adults, we review current evidence and TRT options for adolescents and identify areas of unmet needs. We searched PubMed for articles (in English) on testosterone therapy, androgens, adolescence, and puberty in humans. The results indicate that short-term use of  T enanthate (TE) or oral  T undecanoate is safe and effective in inducing puberty and increasing growth in males with CDGP. Reassuring evidence is emerging on the use of transdermal  T to induce and maintain puberty. The long-term safety and efficacy of TRT for puberty completion and maintenance have not been established. Current  TRT regimens are based on consensus and expert opinion, but evidence-based guidelines are lacking. Limited guidance exists on when and how  T should be administered and optimal strategies for monitoring therapy once it is initiated. Only  TE and  T pellets are US Food and Drug Administration approved for use in adolescent males in the United States. Despite the introduction of a wide variety of new  T formulations, they are designed for adults, and their metered doses are difficult to titrate in adolescents. In conclusion, TRT in adolescent males is hindered by lack of long-term safety and efficacy data and limited options approved for use in this population. Additional research is needed to identify the route, dose, duration, and optimal timing for TRT in adolescents requiring androgen therapy.

Cardiovascular Risk Associated With Gender Affirming Hormone Therapy in Transgender Population

Transgender men and women represent about 0.6 -1.1%% of the general population. Gender affirming hormone therapy (GAHT) helps ameliorate gender dysphoria and promote well-being. However, these treatments' cardiovascular (CV) effects are difficult to evaluate due to the limited number of extensive longitudinal studies focused on CV outcomes in this population. Furthermore, these studies are mainly observational and difficult to interpret due to a variety of hormone regimens and observation periods, together with possible bias by confounding factors (comorbidities, estrogen types, smoking, alcohol abuse, HIV infection). In addition, the introduction of GAHT at increasingly earlier ages, even before the full development of the secondary sexual characteristics, could lead to long-term changes in CV risk compared to current data. This review examines the impact of GAHT in the transgender population on CV outcomes and surrogate markers of CV health. Furthermore, we review available data on changes in DNA methylation or RNA transcription induced by GAHT that may translate into changes in metabolic parameters that could increase CV risk.

Self-administration of gender-affirming hormones: a systematic review of effectiveness, cost, and values and preferences of end-users and health workers

Self-administration of quality gender-affirming hormones is one approach to expanding access to hormone therapy for individuals seeking secondary sex characteristics more aligned with their gender identity or expression and can be empowering when provided within safe, supportive health systems. To inform World Health Organization guidelines on self-care interventions, we systematically reviewed the evidence for self-administration compared to health worker-administration of gender-affirming hormones. We conducted a comprehensive search for peer-reviewed articles and conference abstracts that addressed effectiveness, values and preferences, and cost considerations. Data were extracted in duplicate using standardised forms. Of 3792 unique references, five values and preferences articles were included; no studies met the criteria for the effectiveness or cost reviews. All values and preferences studies focused on self-administration of unprescribed hormones, not prescribed hormones within a supportive health system. Four studies from the U.S. (N = 2), Brazil (N = 1), and the U.K. (N = 1) found that individuals seeking gender-affirming hormone therapy may self-manage due to challenges finding knowledgeable and non-stigmatising health workers, lack of access to appropriate services, exclusion, and discomfort with health workers, cost, and desire for a faster transition. One study from Thailand found health worker perspectives were shaped by restrictive legislation, few transgender-specific services or guidelines, inappropriate communication with health workers, and medical knowledge gaps. There is limited literature on self-administration of gender-affirming hormone therapy. Principles of gender equality and human rights in the delivery of quality gender-affirming hormones are critical to expand access to this important intervention and reduce discrimination based on gender identity.

Medical transition for gender diverse patients

Purpose of review

The purpose of this review is to provide an up-to-date overview of gender-affirming hormone therapy, including the various hormone regimens available, the efficacy and potential risks of these treatments, and considerations for surveillance and long-term care.

Recent findings

Recent studies reaffirm that hormone therapy has positive physical and psychological effects for many transgender individuals. The overall risks of treatment are low. Transgender women may have an increased risk of venous thromboembolism and breast cancer based on recent cohort studies, but these findings have yet to be confirmed with randomized controlled trials. Important long-term considerations include metabolic, cardiovascular, and skeletal health.

Summary

High-quality, long-term studies on the effectiveness and safety of various gender-affirming hormone treatment regimens are lacking, but the currently available evidence suggests that it is overall safe and effective with appropriate oversight.

Delayed and Precocious Puberty: Genetic Underpinnings and Treatments

Delayed puberty may signify a common variation of normal development, or indicate the presence of a pathologic process. Constitutional delay of growth and puberty is a strongly familial type of developmental pattern and accounts for the vast majority of children who are "late bloomers." Individuals with sex chromosomal abnormalities frequently have hypergonadotropic hypogonadism. There are currently 4 known monogenic causes of central precocious puberty. The primary treatment goal in children with hypogonadism is to mimic normal pubertal progression, while the primary aims for the management of precocious puberty are preservation of height potential and prevention of further pubertal development.

Androgens During Infancy, Childhood, and Adolescence: Physiology and Use in Clinical Practice

We provide an in-depth review of the role of androgens in male maturation and development, from the fetal stage through adolescence into emerging adulthood, and discuss the treatment of disorders of androgen production throughout these time periods. Testosterone, the primary androgen produced by males, has both anabolic and androgenic effects. Androgen exposure induces virilization and anabolic body composition changes during fetal development, influences growth and virilization during infancy, and stimulates development of secondary sexual characteristics, growth acceleration, bone mass accrual, and alterations of body composition during puberty. Disorders of androgen production may be subdivided into hypo- or hypergonadotropic hypogonadism. Hypogonadotropic hypogonadism may be either congenital or acquired (resulting from cranial radiation, trauma, or less common causes). Hypergonadotropic hypogonadism occurs in males with Klinefelter syndrome and may occur in response to pelvic radiation, certain chemotherapeutic agents, and less common causes. These disorders all require testosterone replacement therapy during pubertal maturation and many require lifelong replacement. Androgen (or gonadotropin) therapy is clearly beneficial in those with persistent hypogonadism and self-limited delayed puberty and is now widely used in transgender male adolescents. With more widespread use and newer formulations approved for adults, data from long-term randomized placebo-controlled trials are needed to enable pediatricians to identify the optimal age of initiation, route of administration, and dosing frequency to address the unique needs of their patients.

Replacement Hormone Therapy for Gender Dysphoria and Congenital Sexual Anomalies

What is it about sexuality that makes it such a burning matter since the dawn of mankind? Much was lost of humankind heritage because of society's attitude toward sex and gender, but we've made progress. Medical knowledge progressed incredibly and so did social and cultural norms. In these days, on most places on the planet, there is acceptance. Still, gender issues take a center stage, often inflaming the social and political milieu everywhere. So how informed and prepared is the medical community to deal with these issues? Aside from medical treatments, gender dysphoric patients need mental health and social support throughout life. Do we have enough guidelines for treatments that have life-long effects? Do we actually know all of those effects? There are many issues to consider, like fertility preservation, puberty suppression with its adverse effects, and not in the least, the effects of the hormonal therapy on the target tissues.

Impact of Exogenous Testosterone on Reproduction in Transgender Men

Studies show that a subset of transgender men desire children; however, there is a paucity of literature on the effect of gender-affirming testosterone therapy on reproductive function. In this manuscript, we will review the process of gender-affirming hormone therapy for transgender men and what is known about ovarian and uterine consequences of testosterone exposure in transgender men; draw parallels with existing animal models of androgen exposure; summarize the existing literature on parenting experiences and desires in transgender people; discuss considerations for assisted reproductive technologies and fertility preservation; and identify gaps in the literature and opportunities for further research.

Disorders of Puberty: Pharmacotherapeutic Strategies for Management

During puberty, with activation of the hypothalamic pituitary axis that has been quiescent since the neonatal period, linear growth accelerates, secondary sexual characteristics develop, and adult fertility potential and bone mass are achieved, together with psychosocial and emotional maturation.Disordered pubertal onset and progress, either early or late, presents frequently for endocrine care. Where a disorder is found, due either to a central hypothalamic pituitary cause or to primary gonadal failure, pharmacotherapeutic interventions are required to alter the trajectory of disturbed pubertal onset or progress and for maintenance of adolescent and adult sex hormone status. This paper describes pharmacologic interventions used for pubertal disorders but is not intended to address the diagnostic cascade in detail.

Care of the Transgender Patient

Transgender persons are a diverse group whose gender identity differs from their sex recorded at birth. Some choose to undergo medical treatment to align their physical appearance with their gender identity. Barriers to accessing appropriate and culturally competent care contribute to health disparities in transgender persons, such as increased rates of certain types of cancer, substance abuse, mental health conditions, infections, and chronic diseases. Thus, it is important that clinicians understand the specific medical issues that are relevant to this population.

Pharmacokinetics and Acceptability of Subcutaneous Injection of Testosterone Undecanoate

Context

Can injectable testosterone undecanoate (TU) be administered effectively and acceptably by the subcutaneous (SC) route?

Objective

To investigate the acceptability and pharmacokinetics (PK) of SC injection of TU.

Design

Randomized sequence, crossover clinical study of SC vs IM TU injections.

Setting

Ambulatory clinic of an academic andrology center.

Participants

Twenty men (11 hypogonadal, 9 transgender men) who were long-term users of TU. injections. Intervention: Injection of 1000 mg TU (in 4 mL castor oil vehicle) by SC or IM route. Main Outcome Measures: Patient-reported pain, acceptability, and preference scales. PK by measurement of serum testosterone, dihydrotestosterone (DHT), and estradiol (E₂) concentrations with application of population PK methods and dried blood spot (DBS) sampling.

Results

Pain was greater after SC compared with IM injection 24 hours (but not immediately) after injection but both routes were equally acceptable. Ultimately 11 preferred IM, 6 preferred SC, and 3 had no preference. The DBS-based PK analysis of serum testosterone revealed a later time of peak testosterone concentration after SC vs IM injection (8.0 vs 3.3 days) but no significant route differences in model-predicted peak testosterone concentration (8.4 vs 9.6 ng/mL) or mean resident time (183 vs 110 days). The PK of venous serum testosterone, DHT, and E₂ did not differ according to route of injection.

Conclusions

We conclude that SC TU injection is acceptable but produces greater pain 24 hours after injection that may contribute to the overall majority preference for the IM injection. The PK of testosterone, DHT, or E₂ did not differ substantially between SC and IM routes. Hence whereas further studies are required, the SC route represents an alternative to IM injections without a need to change dose for men for whom IM injection is not desired or recommended.

Transmasculine Hormone Therapy

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. Transgender medicine is not a strong part of the medical curriculum, although a large number of transgender persons will search for some kind of gender-affirming care. Because hormonal therapy has beneficial effects, all endocrinologists or hormone-prescribing physicians should be able to provide gender-affirming hormonal care.

Hormone Therapy in Children and Adolescents

For children and adolescents with gender dysphoria, an interdisciplinary care team is essential for proper diagnosis and appropriate treatment. For children who present with gender dysphoria, once puberty begins, they can be treated with gonadotropin-releasing hormone analogs to stop pubertal progression. This allows for further gender exploration, relief of dysphoria, and better cosmetic outcomes by avoiding the physical changes associated with puberty of the gender assigned at birth. After pubertal suppression, the individual may opt to proceed with puberty or start treatment with gender-affirming hormones.

Paediatric and adult-onset male hypogonadism

The hypothalamic-pituitary-gonadal axis is of relevance in many processes related to the development, maturation and ageing of the male. Through this axis, a cascade of coordinated activities is carried out leading to sustained testicular endocrine function, with gonadal testosterone production, as well as exocrine function, with spermatogenesis. Conditions impairing the hypothalamic-pituitary-gonadal axis during paediatric or pubertal life may result in delayed puberty. Late-onset hypogonadism is a clinical condition in the ageing male combining low concentrations of circulating testosterone and specific symptoms associated with impaired hormone production. Testosterone therapy for congenital forms of hypogonadism must be lifelong, whereas testosterone treatment of late-onset hypogonadism remains a matter of debate because of unclear indications for replacement, uncertain efficacy and potential risks. This Primer focuses on a reappraisal of the physiological role of testosterone, with emphasis on the critical interpretation of the hypogonadal conditions throughout the lifespan of the male individual, with the exception of hypogonadal states resulting from congenital disorders of sex development.

Gender-Affirming Hormone Therapy for Transgender Men

There are an estimated 1.4 million transgender adults in the United States, and lack of providers knowledgeable in transgender care is a barrier to health care. Obstetricians and Gynecologists can help increase access in part by becoming competent in gender-affirming hormone therapy. For transgender men, testosterone protocols can be extrapolated from those used for hypogonadal cisgender men. Unfortunately, there are not any high-quality, long-term prospective studies on the effectiveness and safety of different testosterone regimens specifically in transgender men, but the available data suggest that gender-affirming testosterone therapy is safe and effective with proper screening and monitoring.

Clinical Management of Congenital Hypogonadotropic Hypogonadism

The initiation and maintenance of reproductive capacity in humans is dependent on pulsatile secretion of the hypothalamic hormone GnRH. Congenital hypogonadotropic hypogonadism (CHH) is a rare disorder that results from the failure of the normal episodic GnRH secretion, leading to delayed puberty and infertility. CHH can be associated with an absent sense of smell, also termed Kallmann syndrome, or with other anomalies. CHH is characterized by rich genetic heterogeneity, with mutations in >30 genes identified to date acting either alone or in combination. CHH can be challenging to diagnose, particularly in early adolescence where the clinical picture mirrors that of constitutional delay of growth and puberty. Timely diagnosis and treatment will induce puberty, leading to improved sexual, bone, metabolic, and psychological health. In most cases, patients require lifelong treatment, yet a notable portion of male patients (∼10% to 20%) exhibit a spontaneous recovery of their reproductive function. Finally, fertility can be induced with pulsatile GnRH treatment or gonadotropin regimens in most patients. In summary, this review is a comprehensive synthesis of the current literature available regarding the diagnosis, patient management, and genetic foundations of CHH relative to normal reproductive development.

Endocrinology of Transgender Medicine

Gender-affirming treatment of transgender people requires a multidisciplinary approach in which endocrinologists play a crucial role. The aim of this paper is to review recent data on hormonal treatment of this population and its effect on physical, psychological, and mental health. The Endocrine Society guidelines for transgender women include estrogens in combination with androgen-lowering medications. Feminizing treatment with estrogens and antiandrogens has desired physical changes, such as enhanced breast growth, reduction of facial and body hair growth, and fat redistribution in a female pattern. Possible side effects should be discussed with patients, particularly those at risk for venous thromboembolism. The Endocrine Society guidelines for transgender men include testosterone therapy for virilization with deepening of the voice, cessation of menses, and increases of muscle mass and facial and body hair. Owing to the lack of evidence, treatment of gender nonbinary people should be individualized. Young people may receive pubertal suspension, consisting of GnRH analogs, later followed by sex steroids. Options for fertility preservation should be discussed before any hormonal intervention. Morbidity and cardiovascular risk with cross-sex hormones is unchanged among transgender men and unclear among transgender women. Sex steroid-related malignancies can occur but are rare. Mental health problems such as depression and anxiety have been found to reduce considerably following hormonal treatment. Future studies should aim to explore the long-term outcome of hormonal treatment in transgender people and provide evidence as to the effect of gender-affirming treatment in the nonbinary population.