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Risk of thrombotic events should not exclude transgender people from receiving hormone therapy, says new guidance

The negative mental and physical effects of withholding gender affirming hormone therapy (GAHT) from transgender people may outweigh the risk of GAHT-associated venous thromboembolism (VTE), underscoring the need for a thorough upfront discussion by healthcare provider and patient.

The negative mental and physical effects of withholding gender affirming hormone therapy (GAHT) from transgender people may outweigh the risk of GAHT-associated venous thromboembolism (VTE), underscoring the need for a thorough upfront discussion by healthcare provider and patient, according to a study led by investigators from Massachusetts General Hospital, other Mass General Brigham hospitals, and transgender health experts from across the country.

The team’s findings, published in Endocrine Practice, provide the foundation for new guidance for assessing, managing, and treating VTE (potentially serious blood clots that form in deep veins) in transgender patients of all ages receiving feminizing hormone therapy.

“Considerable data have emerged over the past three years showing that not providing GAHT results in poor mental and physical health outcomes and increases the risk of suicidality in transgender patients,” says Robbie Goldstein, MD, PhD, founder and former medical director of the MGH Transgender Health Program.

“Our review found that VTE can be managed in most cases with anticoagulation therapy, and that discontinuing hormone therapy is not always the right answer and, in many cases, may be the wrong answer.”

The new recommendations from a national team of transgender health specialists are the most comprehensive to date in a field of medicine that has undergone enormous change in recent years, driven by an adult transgender population now estimated at 1.4 million people in the U.S.

A challenge for researchers is gathering evidence in an area where little data exist, given the paucity of trial data for transgender patients on hormone therapy undergoing various gender affirming surgical procedures.

Data extrapolated from the cisgender population (i.e. individuals whose sex at birth corresponds to their current gender identify) indicate that the risk of VTE in patients receiving GAHT, specifically estrogen, was slightly elevated—though still minimal—compared to cisgender women not on hormone therapy.

Duration of hormone therapy and route of administration may increase the risk of VTE in the transgender population, especially around the time of procedures such as vaginoplasty, facial feminization, or breast augmentation.

The protocols outlined in the paper specifically address treatment after a thrombotic event. The team of experts recommended that transgender people who develop VTE while on GAHT be treated with the same regimen as cisgender patients, that is, direct oral anticoagulation over vitamin K antagonists or low-molecular-weight heparin to minimize the threat of bleeding.

“Many people diagnosed with VTE are taken off hormone therapy by their healthcare providers and never restarted,” notes co-author Nathan Connell, MD, MPH, chief of Medicine, Brigham and Women’s Faulkner Hospital, and a hematologist at Brigham and Women’s Hospital.

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“This practice is based on limited data, however, and we found evidence to suggest that hormone therapy can be continued in patients, even those with a VTE history, as long as full-intensity anticoagulation is also continued.”

As Goldstein points out, it’s crucial for the growing numbers of clinicians who treat transgender patients to become more informed and better prepared in an increasingly specialized field.

“It’s incumbent on the medical community to build trust within the transgender community,” he says, “and we’re hopeful that our guidance will help change practice for many primary care providers, hematologists and endocrinologists, resulting in direct and positive impacts on the mortality and morbidity of transgender patients.”

The authors include Goldstein, instructor in Medicine, Harvard Medical School (HMS) and MGH; Connell, associate professor in Medicine, HMS and Brigham and Women’s Hospital (BWH); Mabel Toribio, MD, assistant professor in Medicine, HMS and MGH; Devin O’Brien-Coon, MD, MS, associate professor in Plastic Surgery, HMS and BWH; Anna Goldman, MD, instructor in Medicine, HMS and BWH; and Frances Grimstad, MD, assistant professor in Obstetrics, Gynecology, and Reproductive Medicine, HMS, BWH, and Boston Children’s Hospital.

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