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Long-term use of gonadotropin-releasing hormone analogs and hormone replacement therapy in the management of endometriosis: a randomized trial with a 6-year follow-up

March 18, 2025

  • Women’s Health
    Women’s Health

    Women’s health, a vital aspect of medical science, encompasses various conditions unique to women’s physiological makeup. Historically, women were often excluded from clinical research, leading to a gap in understanding the intricacies of women’s health needs. However, recent advancements have highlighted the significant role that the microbiome plays in these conditions, offering new insights and potential therapies. MicrobiomeSignatures.com is at the forefront of exploring the microbiome signature of each of these conditions to unravel the etiology of these diseases and develop targeted microbiome therapies.

Last Updated: 2024

Microbiome Signatures identifies and validates condition-specific microbiome shifts and interventions to accelerate clinical translation. Our multidisciplinary team supports clinicians, researchers, and innovators in turning microbiome science into actionable medicine.

Karen Pendergrass

Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease—four years before the first published case study.

Who was studied?

The study included forty-nine symptomatic women diagnosed with endometriosis via laparoscopy, who volunteered to participate in the randomized trial. These women were undergoing treatment with long-acting GnRH agonists and were subsequently monitored for up to six years.

 

What were the most important findings?

The study’s key findings indicate that long-term use of GnRH agonists results in a reduction in bone mineral density (BMD) at the lumbar spine and hip, a reduction that was not fully recovered even up to six years post-treatment. Additionally, the inclusion of hormone replacement therapy (HRT) did not significantly influence bone mineral density when compared to those who did not receive HRT. The results also demonstrated a considerable range of individual variability in BMD response among the participants, suggesting that the effects of GnRH agonists on BMD can vary significantly among different women.

 

What are the greatest implications of this study?

The implications of these findings are substantial for the management of endometriosis. The study underscores the potential risks associated with long-term GnRH agonist therapy, particularly concerning bone health, which may significantly influence treatment decisions and patient counseling. It also highlights the critical need for monitoring bone mineral density (BMD) in women undergoing prolonged GnRH agonist therapy, suggesting that this monitoring should possibly extend beyond the cessation of treatment. Furthermore, the observed variability in BMD response among participants indicates a need for individualized treatment plans, which may include exploring alternative therapies or preventive measures against bone density loss. Additionally, these findings could drive further research aimed at optimizing ‘add-back’ therapy to balance the effectiveness of GnRH agonists in managing endometriosis symptoms with the mitigation of side effects such as bone loss.

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