Systemic Vascular and Organ Functions in Transgender Women Receiving Feminizing Hormone Therapy

While estrogen is known to confer cardioprotective benefits in cisgender women, transgender women on gender-affirming hormone therapy may experience unique cardiovascular risks. Emerging evidence suggests that feminizing hormone therapy may confer both beneficial and adverse effects on cardiovascular, renal, and hepatic systems. In this cross-sectional study, transgender women receiving gender-affirming hormone therapy with orchiectomy (n=15) or without orchiectomy (n=15) were compared with age-matched cisgender men (n=15) and cisgender women (n=15). Transgender women had received hormone therapy for 11±3 years. Serum estradiol concentrations were significantly lower in cisgender men (33±10 pg/mL) than in transgender women with orchiectomy (141±47 pg/mL), transgender women without orchiectomy (116±41 pg/mL), and cisgender women (131±38 pg/mL), whereas serum testosterone concentrations were significantly higher in cisgender men (22.0±6.1 nmol/l) compared with the other groups (1.2±1.1, 0.6±0.3, 1.0±0.3 nmol/l) (all p0.05). Blood urea nitrogen, creatinine, and liver enzyme concentrations were significantly higher in cisgender men than in the other groups (all p<0.05). Collectively, these results indicate that no statistically significant differences were observed in macro- and microvascular function, as well as liver and renal function, between transgender women (with or without orchiectomy) and cisgender women.