Perspectives of Sexual and Gender Minority Youth on Anti-Vaping Messages in Social Media.

INTRODUCTION: Sexual and gender minority (SGM) youth have higher rates of nicotine vaping than other youth in the United States. While social media can be effective in reaching youth and discouraging vaping, informed cultural tailoring is necessary to ensure effective messaging to SGM youth. This study aimed to understand SGM youth perspectives on anti-vaping social media messages and tailoring approaches. METHODS: In-depth, qualitative videoconference interviews were conducted from February to July 2022 with 34 SGM youth recruited in the United States via social media ads. The interview guide addressed participants' beliefs about vaping, the context of vaping, perspectives on tailoring messages, and responses to examples of social media anti-vaping messages. Coding and thematic analysis followed a team-based approach. RESULTS: SGM youth perspectives fell into four categories - representation and diversity, facts and evidence, empowering messages, and source credibility. Participants stressed the importance of accurate, genuine representation of SGM youth in messages, but also noted that more overt representation may be seen as tokenizing. Participants recommended partnering with known LGBTQ+ influencers who can promote or share anti-vaping messages on social media platforms. They also recommended using culturally tailored language, including statistics specific to SGM youth, and invoking themes of empowerment to improve the relevance, reach, and effectiveness of anti-vaping campaigns. CONCLUSIONS: Findings can inform future efforts to develop anti-vaping messages for SGM youth with effective reach through social media. Nuanced perspectives on SGM representation in messages suggest a careful approach to tailoring. Concerns around inauthenticity may be minimized by ensuring SGM youth are included in message development and dissemination. IMPLICATIONS: This study describes the importance of being attentive to the tailoring preferences among the current generation of sexual and gender minority youth. Findings will inform social media-based messaging strategies that discourage nicotine vaping tailored for SGM youth in health campaign material design and evaluation, ensuring that tailored messages are designed in ways that avoid unintended consequences. The study also describes methods for effectively engaging SGM youth in research to improve the relevance of health education materials for this population and increase reach, which in turn can lead to reduction in vaping practices among SGM youth.

Incorporation of Trauma-Informed Care Into Entrustable Professional Activities for Medical Student Assessment.

PROBLEM: Trauma-informed care (TIC) provides a medical framework for addressing and mitigating the negative consequences of trauma. In response to student and faculty advocacy, medical schools are developing trauma-informed curricular content. However, medical education literature does not present a comprehensive assessment rubric to evaluate medical students' acquisition of trauma-informed clinical skills. APPROACH: A committee of medical students, trainees, and faculty developed a longitudinal TIC curricular theme at Harvard Medical School (HMS). Guided by the National Collaborative on Trauma-Informed Health Care Education and Research competencies, the committee created a set of medical student TIC competencies from July to December 2019. From November 2021 to November 2022, 3 committee subgroups generated new TIC descriptors for each HMS entrustable professional activity (EPA), then circulated these to other subgroups, external experts, and stakeholders for review and feedback. From April to June 2023, the committee iteratively reviewed the materials until reaching consensus for content and pedagogy. The committee integrated TIC content into HMS's existing EPAs expected of students, provided anchoring descriptions of each level, and achieved consensus using a process of iterative review with TIC content experts. OUTCOMES: The committee identified 10 TIC competencies and revised all 13 general HMS EPAs to include specific items based on these competencies. The committee incorporated at least 1 trauma-informed competency into each HMS EPA. NEXT STEPS: This novel set of HMS EPAs provides a framework for assessment of TIC clinical skills. Faculty will be trained to correctly and reliably incorporate TIC competencies into patient care and to use the TIC-inclusive EPAs for student assessment, ensuring that TIC is standard medical practice at HMS. This work may facilitate the adoption of trauma-inclusive EPAs by other institutions to educate the next generation of physicians to practice TIC and thus promote a more accessible, safe, and equitable health care system.

Trauma-informed precepting: A novel curriculum for faculty development.

PURPOSE: Traumatic experiences are ubiquitous and associated with negative impacts on health and wellbeing in patients, students, and clinicians. Trauma-informed care (TIC) is a harm reduction framework that aims to minimize re-traumatization and the negative health impacts of trauma. TIC is increasingly being incorporated into undergraduate medical education (UME) curricula; however, to date, there is no standardized curriculum to support faculty in precepting TIC clinical skills. METHODS: We created a series of five educational modules in an asynchronous online format to support faculty in the instruction and precepting of TIC clinical skills in UME. The modules instruct on trauma epidemiology, trauma-informed clinical skills, trauma-informed precepting, and trauma-informed self-care (TISC). The modules are interactive and utilize multimedia content. RESULTS: Fifty-three faculty members of the primary care clerkship participated in the modules. After the modules, faculty demonstrated increased knowledge of TIC, though their comfort in applying principles with patients and students was unchanged. DISCUSSION: We present a novel, standardized curriculum to support faculty in the practice and precepting of TIC clinical skills. The intervention is shown to promote knowledge surrounding TIC. In the future, pairing these asynchronous modules with in-person training may be necessary to improve comfort with the application of these skills.

Effect of testosterone therapy on breast tissue composition and mammographic breast density in trans masculine individuals.

BACKGROUND: The effect of gender-affirming testosterone therapy (TT) on breast cancer risk is unclear. This study investigated the association between TT and breast tissue composition and breast tissue density in trans masculine individuals (TMIs). METHODS: Of the 444 TMIs who underwent chest-contouring surgeries between 2013 and 2019, breast tissue composition was assessed in 425 TMIs by the pathologists (categories of lobular atrophy and stromal composition) and using our automated deep-learning algorithm (% epithelium, % fibrous stroma, and % fat). Forty-two out of 444 TMIs had mammography prior to surgery and their breast tissue density was read by a radiologist. Mammography digital files, available for 25/42 TMIs, were analyzed using the LIBRA software to obtain percent density, absolute dense area, and absolute non-dense area. Linear regression was used to describe the associations between duration of TT use and breast tissue composition or breast tissue density measures, while adjusting for potential confounders. Analyses stratified by body mass index were also conducted. RESULTS: Longer duration of TT use was associated with increasing degrees of lobular atrophy (p < 0.001) but not fibrous content (p = 0.82). Every 6 months of TT was associated with decreasing amounts of epithelium (exp(ß) = 0.97, 95% CI 0.95,0.98, adj p = 0.005) and fibrous stroma (exp(ß) = 0.99, 95% CI 0.98,1.00, adj p = 0.05), but not fat (exp(ß) = 1.01, 95%CI 0.98,1.05, adj p = 0.39). The effect of TT on breast epithelium was attenuated in overweight/obese TMIs (exp(ß) = 0.98, 95% CI 0.95,1.01, adj p = 0.14). When comparing TT users versus non-users, TT users had 28% less epithelium (exp(ß) = 0.72, 95% CI 0.58,0.90, adj p = 0.003). There was no association between TT and radiologist's breast density assessment (p = 0.58) or LIBRA measurements (p > 0.05). CONCLUSIONS: TT decreases breast epithelium, but this effect is attenuated in overweight/obese TMIs. TT has the potential to affect the breast cancer risk of TMIs. Further studies are warranted to elucidate the effect of TT on breast density and breast cancer risk.

Barriers to and opportunities for advancing racial equity in cervical cancer screening in the United States.

BACKGROUND: In the United States (U.S.), racially minoritized people have higher rates of cervical cancer morbidity and mortality compared to white individuals as a result of racialized structural, social, economic, and health care inequities. However, cervical cancer screening guidelines are based on studies of predominately white individuals and do not substantially discuss or address racialized cervical cancer inequities and their social determinants, including racism. METHODS: We conducted in-depth interviews with health care providers (N = 30) and key informants with expertise in health equity (N = 18). We utilized semi-structured interview guides that addressed providers' views and experiences delivering cervical cancer screening to racially minoritized individuals and key informants' recommendations for advancing racial equity in the development and implementation of cervical cancer screening guidelines. Interviews were analyzed using a template style thematic analysis approach involving deductive and inductive coding, memo writing, and matrix analysis for theme development. RESULTS: Most health care providers adopted a universal, one-size-fits-all approach to cervical cancer screening with the stated goal of ensuring racial equality. Despite frequently acknowledging the existence of racialized cervical cancer inequities, few providers recognized the role of social inequities in influencing them, and none discussed the impact of racism. In contrast, key informants overwhelmingly recommended that providers adopt an approach to cervical cancer screening and follow-up care that recognizes the role of racism in shaping racialized cervical cancer and related social inequities, is developed in partnership with racially minoritized communities, and involves person-centered, structurally-competent, and trauma-informed practices that address racially minoritized peoples' unique lived experiences in historical and social context. This racism-conscious approach is not to be confused with race-based medicine, which is an essentialist and racist approach to health care that treats race as a biological variable rather than as a social and political construct. CONCLUSIONS: Developers and implementers of cervical cancer screening guidelines should explicitly recognize and address the impact of racism on cervical cancer screening, follow-up care, and outcomes, meaningfully incorporate racially minoritized communities' perspectives and experiences, and facilitate provider- and institutional-level practices that foster racial equity in cervical cancer.

Leveraging Project ECHO to Implement a Suite of Substance Use Learning Communities for Statewide Impact.

BACKGROUND: Overdoses and alcohol consumption rose during the pandemic. However, uptake of practices which reduce mortality (eg, medications for opioid use disorder, harm reduction practices) remains insufficient. Provider training and telementoring is needed to ensure sufficient capacity for treating substance use disorders (SUDs) with evidence-based practices. The Project ECHO (Extension for Community Healthcare Outcomes) model involves the use of web technologies to deliver didactic and case-based learning through a panel of experts to build such competency in a community of learners. Project ECHO was leveraged to implement a statewide telementoring center of addictions-focused ECHO programs, including programming in prescribing, harm reduction, recovery support services, collaborations with first responders, and systems-level challenges. METHODS: Participants represented health and behavioral health disciplines practicing across the state of Texas in metropolitan and rural areas. Learners were administered: (1) an online registration form that inquired about basic demographics, (2) a post-session survey at the conclusion of each session capturing satisfaction and likelihood to implement, and (3) annual surveys measuring changes in knowledge and self-efficacy. Attendance and other learner data were stored and extracted from the partner relationship management database: iECHO. RESULTS: Training programs were attended by 968 learners, with an average of 48 learners per session. Geographic reach included 47 Texas cities. Post-training survey results indicated high rates of learner satisfaction, with an average rating of 4.68 on a 5-point Likert-like scale. Annual surveys indicated improvements in provider knowledge and self-confidence across all programs. CONCLUSIONS: Early results indicate robust uptake, wide geographic reach, high learner satisfaction, and provider knowledge and confidence gains. This preliminary evidence supports the use of the ECHO model as a potential tool for scaling comprehensive SUD telementoring centers to meet workforce development needs over large geographic areas.

Sexual and gender minority content in undergraduate medical education in the United States and Canada: current state and changes since 2011.

PURPOSE: To characterize current lesbian, gay, bisexual, transgender, queer, and intersex (LGBTQI +) health-related undergraduate medical education (UME) curricular content and associated changes since a 2011 study and to determine the frequency and extent of institutional instruction in 17 LGBTQI + health-related topics, strategies for increasing LGBTQI + health-related content, and faculty development opportunities. METHOD: Deans of medical education (or equivalent) at 214 allopathic or osteopathic medical schools in Canada and the United States were invited to complete a 36-question, Web-based questionnaire between June 2021 and September 2022. The main outcome measured was reported hours of LGBTQI + health-related curricular content. RESULTS: Of 214 schools, 100 (46.7%) responded, of which 85 (85.0%) fully completed the questionnaire. Compared to 5 median hours dedicated to LGBTQI + health-related in a 2011 study, the 2022 median reported time was 11 h (interquartile range [IQR], 6-16 h, p < 0.0001). Two UME institutions (2.4%; 95% CI, 0.0%-5.8%) reported 0 h during the pre-clerkship phase; 21 institutions (24.7%; CI, 15.5%-33.9%) reported 0 h during the clerkship phase; and 1 institution (1.2%; CI, 0%-3.5%) reported 0 h across the curriculum. Median US allopathic clerkship hours were significantly different from US osteopathic clerkship hours (4 h [IQR, 1-6 h] versus 0 h [IQR, 0-0 h]; p = 0.01). Suggested strategies to increase content included more curricular material focusing on LGBTQI + health and health disparities at 55 schools (64.7%; CI, 54.6%-74.9%), more faculty willing and able to teach LGBTQI + -related content at 49 schools (57.7%; CI, 47.1%-68.2%), and more evidence-based research on LGBTQI + health and health disparities at 24 schools (28.2%; CI, 18.7%-37.8%). CONCLUSION: Compared to a 2011 study, the median reported time dedicated to LGBTQI + health-related topics in 2022 increased across US and Canadian UME institutions, but the breadth, efficacy, or quality of instruction continued to vary substantially. Despite the increased hours, this still falls short of the number of hours based on recommended LGBTQI + health competencies from the Association of American Medical Colleges. While most deans of medical education reported their institutions' coverage of LGBTQI + health as 'fair,' 'good,' or 'very good,' there continues to be a call from UME leadership to increase curricular content. This requires dedicated training for faculty and students.

Gender-Affirming Hormone Therapy and Cervical Cancer Screening Rates in Transgender Men and Nonbinary People: A Cross-Sectional Study from a Boston Community Health Center.

Purpose: Clinical monitoring for patients receiving gender-affirming hormone therapy (GAHT) has the potential to facilitate their receipt of preventive health services. We aimed to determine whether GAHT is associated with increased utilization of cervical cancer screening among transgender men (TM) and nonbinary persons assigned female at birth (NB-AFAB). Methods: We conducted a cross-sectional observational study of a single community health center in Boston. Persons of all gender identities eligible for cervical cancer screening during 2008-2019 were assessed. The outcome of interest was receipt of cervical cancer screening based on U.S. Preventive Services Task Force recommendations. We compared the proportion of persons who received cervical cancer screening by prescription of GAHT. Results: We identified 13,267 eligible persons. This cohort included 10,547 (79.5%) cisgender women, 1547 (11.7%) TM, and 1173 (8.8%) NB-AFAB persons. Among all persons eligible for cervical cancer screening, TM and NB-AFAB persons were less likely to receive screening than cisgender women (56.2% and 56.1% vs. 60.5% respectively; odds ratio [OR] = 0.84; 95% confidence interval [CI] = 0.75-0.93; OR = 0.84; 95% CI = 0.74-0.94, respectively). Among TM, those prescribed testosterone were more likely to receive cervical cancer screening than those not prescribed testosterone (57.9% vs. 48.2%, OR = 1.47; 95% CI = 1.14-1.92). Among NB-AFAB adults, those prescribed testosterone were more likely to receive cervical cancer screening than those not prescribed testosterone (61.9% vs. 51.5%, OR = 1.53; 95% CI = 1.21-1.93). Conclusions: The benefits of engagement in care to access GAHT may extend beyond the hormonal intervention to preventive health services.

Development and Evaluation of a Digital App for Patient Self-Management of Opioid Use Disorder: Usability, Acceptability, and Utility Study.

BACKGROUND: Self-management of opioid use disorder (OUD) is an important component of treatment. Many patients receiving opioid agonist treatment in methadone maintenance treatment settings benefit from counseling treatments to help them improve their recovery skills but have insufficient access to these treatments between clinic appointments. In addition, many addiction medicine clinicians treating patients with OUD in a general medical clinic setting do not have consistent access to counseling referrals for their patients. This can lead to decreases in both treatment retention and overall progress in the patient's recovery from substance misuse. Digital apps may help to bridge this gap by coaching, supporting, and reinforcing behavioral change that is initiated and directed by their psychosocial and medical providers. OBJECTIVE: This study aimed to conduct an acceptability, usability, and utility pilot study of the KIOS app to address these clinical needs. METHODS: We developed a unique, patient-centered computational software system (KIOS; Biomedical Development Corporation) to assist in managing OUD in an outpatient, methadone maintenance clinic setting. KIOS tracks interacting self-reported symptoms (craving, depressed mood, anxiety, irritability, pain, agitation or restlessness, difficulty sleeping, absenteeism, difficulty with usual activities, and conflicts with others) to determine changes in both the trajectory and severity of symptom patterns over time. KIOS then applies a proprietary algorithm to assess the individual's patterns of symptom interaction in accordance with models previously established by OUD experts. After this analysis, KIOS provides specific behavioral advice addressing the individual's changing trajectory of symptoms to help the person self-manage their symptoms. The KIOS software also provides analytics on the self-reported data that can be used by patients, clinicians, and researchers to track outcomes. RESULTS: In a 4-week acceptability, usability (mean System Usability Scale-Modified score 89.5, SD 9.2, maximum of 10.0), and utility (mean KIOS utility questionnaire score 6.32, SD 0.25, maximum of 7.0) pilot study of 15 methadone-maintained participants with OUD, user experience, usability, and software-generated advice received high and positive assessment scores. The KIOS clinical variables closely correlated with craving self-report measures. Therefore, managing these variables with advice generated by the KIOS software could have an impact on craving and ultimately substance use. CONCLUSIONS: KIOS tracks key clinical variables and generates advice specifically relevant to the patient's current and changing clinical state. Patients in this pilot study assigned high positive values to the KIOS user experience, ease of use, and the appropriateness, relevance, and usefulness of the specific behavioral guidance they received to match their evolving experiences. KIOS may therefore be useful to augment in-person treatment of opioid agonist patients and help fill treatment gaps that currently exist in the continuum of care. A National Institute on Drug Abuse-funded randomized controlled trial of KIOS to augment in-person treatment of patients with OUD is currently being conducted.

Sociodemographic and patient reported outcomes by racial and ethnicity status among participants in a randomized controlled trial for methamphetamine use disorder.

Background: There has been a significant increase in methamphetamine use and methamphetamine use disorder (Meth UD) in the United States, with evolving racial and ethnic differences. Objectives: This secondary analysis explored racial and ethnic differences in baseline sociodemographic and clinical characteristics as well as treatment effects on a measure of substance use recovery, depression symptoms, and methamphetamine craving among participants in a pharmacotherapy trial for Meth UD. Methods: The ADAPT-2 trial (ClinicalTrials.gov number, NCT03078075; N=403; 69% male) was a multisite, 12-week randomized, double-blind, trial that employed a two-stage sequential parallel design to evaluate the efficacy of combination naltrexone (NTX) and oral bupropion (BUP) vs. placebo for Meth UD. Treatment effect was calculated as the weighted mean change in outcomes in the NTX-BUP minus placebo group across the two stages of treatment. Results: Of the 403 participants in the ADAPT-2 trial, the majority (65%) reported non-Hispanic White, while 14%, 11% and 10% reported Hispanic, non-Hispanic Black, and non-Hispanic other racial and ethnic categories respectively. At baseline non-Hispanic Black participants reported less severe indicators of methamphetamine use than non-Hispanic White. Treatment effects for recovery, depression symptoms and methamphetamine cravings did not significantly differ by race and ethnicity. Conclusions: Although we found racial and ethnic differences at baseline, our findings did not show racial and ethnic differences in treatment effects of NTX-BUP on recovery, depression symptoms and methamphetamine cravings. However, our findings also highlight the need to expand representation of racial and ethnic minority groups in future trials.

Development of a mentor training curriculum to support LGBTQIA+ health professionals.

While mentors can learn general strategies for effective mentoring, existing mentorship curricula do not comprehensively address how to support marginalized mentees, including LGBTQIA+ mentees. After identifying best mentoring practices and existing evidence-based curricula, we adapted these to create the Harvard Sexual and Gender Minority Health Mentoring Program. The primary goal was to address the needs of underrepresented health professionals in two overlapping groups: (1) LGBTQIA+ mentees and (2) any mentees focused on LGBTQIA+ health. An inaugural cohort (N = 12) of early-, mid-, and late-career faculty piloted this curriculum in spring 2022 during six 90-minute sessions. We evaluated the program using confidential surveys after each session and at the program's conclusion as well as with focus groups. Faculty were highly satisfied with the program and reported skill gains and behavioral changes. Our findings suggest this novel curriculum can effectively prepare mentors to support mentees with identities different from their own; the whole curriculum, or parts, could be integrated into other trainings to enhance inclusive mentoring. Our adaptations are also a model for how mentorship curricula can be tailored to a particular focus (i.e., LGBTQIA+ health). Ideally, such mentor trainings can help create more inclusive environments throughout academic medicine.

Navigating the Roadmap for Trauma-Informed Medical Education: Application of Undergraduate Medical Education Competencies.

BACKGROUND: Trauma is common in the United States, increases risk of long-term adverse health effects, and individuals who experience it often find seeking medical care difficult. Trauma-informed care (TIC) builds trust and fosters healing relationships between clinicians and patients; however medical education has lacked consistent training in TIC. Using recently published competencies for undergraduate medical education (UME), this manuscript provides curricular examples across 8 domains to assist faculty in developing educational content. METHODS: The authors identified published curricula for each of the 8 competency domains using a published search strategy and publicly available database. Inclusion criteria were published works focused on UME in the United States; abstracts and curricula not focused on UME were excluded. The authors used a consensus-based process to review 15 eligible curricula for mapping with the competencies. RESULTS: Of 15 published UME curricula, 11 met criteria and exemplify each of the 8 UME competency domains. Most of the available curricula fall into the Knowledge for Practice and Patient Care domains. Most were offered in the first 2 years of medical school. CONCLUSION: Competency-based medical education for TIC is new, and most current educational offerings are foundational in nature. Additional innovation is needed in the competency domains of Professionalism, Systems-Based Practice, Interprofessional Collaboration, and Personal/Professional Development. This manuscript offers a set of curricular examples that can be used to aid efforts at implementing TIC competencies in UME; future work must focus on improving assessment methods and developmental sequencing as more students are exposed to TIC principles.

Promoting equitable sexual health communication among patients with minoritized racial/ethnic, sexual orientation, and gender identities: Strategies, challenges, and opportunities.

People assigned female at birth (AFAB) with minoritized racial/ethnic, sexual orientation, and gender identities experience notable barriers to high-quality sexual healthcare. In confronting these barriers, patient-provider communication can be a crucial factor, influencing patients' experiences and access to relevant sexual health information and services by determining the quality of care. However, research that investigates this communication among AFAB patients with minoritized social positions is scarce, indicating a research gap regarding the perspectives and roles of healthcare providers in addressing such barriers to care for minoritized patients. Thus, we conducted a qualitative research study, using individual in-depth interviews, to explore the multi-level factors that influence providers' attitudes, knowledge, and skills regarding sexual health communication with AFAB patients with minoritized racial/ethnic, sexual orientation, and gender identities. Interpreting study findings within frameworks of person-centered care, intersectionality, and structural competency, we identified three cross-cutting themes. We found that providers frequently drew on their prior professional training, personal lived experiences, and population-level health disparities data when engaging in sexual health communication with minoritized AFAB patients. Participants reported minimal explicit training in anti-racist and lesbian, gay, bisexual, transgender, and queer (LGBTQ+)-competent care as a significant barrier to engaging in equitable sexual health communication with minoritized AFAB patients, which was exacerbated by many providers' lack of shared social positions and lived experiences with these patients. Providers also frequently applied population-level data to individual patients when formulating counseling and recommendations, which may undermine person-centered sexual health communication. Our findings suggest that critical anti-racist and LGBTQ+-competent provider training is urgently needed, and that health professional education and institutions must be transformed to better reflect and consider the experiences of patients with minoritized racial/ethnic, sexual orientation, and gender identities.

Toward Integration of Trauma, Resilience, and Equity Theory and Practice: A Narrative Review and Call for Consilience.

Investigating the roots of health and illness has inspired unprecedented growth in research on trauma and adversity across academic and scientific disciplines. Can this science achieve its potential? How? Much of this research remains siloed and fragmented, limiting integrative approaches to translating science into a unified paradigm. From age-old traditions to the health, social, and basic sciences, this established and rapidly growing body of work has overwhelmingly found that experiences, both positive and negative, profoundly influence life course health. Such convergence across disciplines highlights the complex, intersectional nature and impact of experiences and reveals consilience: agreement of findings across diverse fields. This narrative review explored 400 sources to curate a representative sample of 98 tracing the evolution of trauma theory and practice from the 19th century to the present. It emphasizes research from 1970 to 2022, with a specific focus on adverse childhood experiences, everyday discrimination, sexual and gender minority stress, acculturative stress, and positive childhood experiences. This research reveals how experiences are a cause, catalyst, and key ingredient of health or of illness, disability, and disparities. The review also proposes steps toward a unified paradigm and showcases innovative integrated models and applications. These examples provide a more comprehensive and nuanced understanding and lead to more effective solutions. Recognition of consilience can connect multidimensional insights on trauma, resilience, and equity to spark further cross-sector innovations toward health, prevention, and justice. Realizing the promise of consilience will require a new era of radical intentionality, ongoing dialogue, and interdisciplinary collaboration to achieve necessary system transformation.

Effect of testosterone therapy on breast tissue composition and mammographic breast density in trans masculine individuals.

Objective: Determine the association between TT and breast tissue composition and breast tissue density in trans masculine individuals (TMIs). Design: This is a cross-sectional study. Setting: TMIs (n=444) underwent chest-contouring surgeries to treat their gender dysphoria between 2013 and 2019 at an urban medical center. Participants: Of the 444 TMIs, 425 had pathology images analyzed by our deep-learning algorithm to extract breast tissue composition. A subset of 42/444 TMIs had mammography prior to surgery; mammography files were available for 25/42 TMIs and analyzed using a breast density software, LIBRA. Main Outcomes and Measures: The first outcome was the association of duration of TT and breast tissue composition assessed by pathologists (categories of lobular atrophy and stromal composition) or by our algorithm (% epithelium, % fibrous stroma, and % fat). The second outcome is the association of TT and breast density as assessed by a radiologist (categorical variable) or by LIBRA (percent density, absolute dense area, and absolute non-dense area). Results: Length of TT was associated with increasing degrees of lobular atrophy ( p <0.001) but not fibrous content ( p =0.821) when assessed by the pathologists. Every six months of TT was associated with decreased amounts of both epithelium (exp(ß)=0.97, 95% CI 0.95-0.98, adj p =0.005) and stroma (exp(ß)=0.99, 95% CI 0.98-1.00, adj p =0.051), but not fat (exp(ß)=1.01, 95%CI 0.98-1.05, p =0.394) in fully adjusted models. There was no association between TT and radiologist's breast density assessment ( p =0.575) or LIBRA measurements ( p >0.05). Conclusions: TT decreases breast epithelium and fibrous stroma, thus potentially reducing the breast cancer risk of TMIs. Further studies are warranted to elucidate the effect of TT on breast density and breast cancer risk. Summary Box: Very little is known about the effect of gender-affirming testosterone therapy on cancer risks, such as breast cancer.Epidemiological studies had different conclusions about the association between testosterone and breast cancer in cisgender women (positive association) and trans masculine individuals (inverse association).More laboratory-based research are needed to understand the effect of testosterone on breast cancer risk in the understudied trans masculine population.Our study provides quantitative histological evidence to support prior epidemiological reports that testosterone may reduce breast cancer risk in trans masculine individuals.