Ultrasound Transformation of Myomas During Relugolix-Estradiol-Norethisterone Treatment: The MySaturn Study

Overview

Uterine fibroids are benign tumors originating from the uterine muscle, affecting up to 70% of women by their 50s. Risk factors include African descent, nulliparity, obesity, and diabetes. While many fibroids are asymptomatic, 25-50% of affected women experience symptoms like heavy menstrual bleeding, pelvic pain, and pressure-related issues. Accurate diagnosis and differentiation from rare malignant tumors (e.g., uterine sarcomas) remain challenging, particularly before surgery. Ultrasound is the first-line tool for evaluating fibroids, with specific features (e.g., shape, vascularity) helping distinguish benign from suspicious lesions. The MUSA guidelines standardize ultrasound terminology for myometrial assessments. Current treatment options vary based on symptoms and malignancy risk. Among pharmacologic options, the combination of relugolix, estradiol, and norethisterone has shown efficacy in reducing bleeding and pain in symptomatic fibroids, with a favorable safety profile. However, its impact on fibroid morphology and ultrasound appearance is not yet well understood.

Uterine fibroids are the most common benign tumors in women of reproductive age, affecting up to 70% of women in their 40s and 50s. While often asymptomatic, around 25-50% experience symptoms such as heavy menstrual bleeding, pelvic pain, and pressure-related issues. The severity depends on the number, size, and location of the fibroids. Though most fibroids are benign, a small risk exists for malignant uterine tumors (e.g., leiomyosarcomas, STUMPs). Diagnosing these malignancies preoperatively remains a challenge due to the lack of reliable imaging markers. Ultrasound is the first-line diagnostic tool, guided by MUSA criteria, but further prospective data are needed to improve risk stratification. The combination of Relugolix, Estradiol, and Norethisterone (Ryeqo®) is an effective medical treatment for symptomatic fibroids, especially in premenopausal women. It reduces bleeding while minimizing side effects of estrogen deprivation. Over 70% of women in clinical trials have shown significant improvement within 24 weeks. However, its effect on fibroid morphology and ultrasound features remains unclear. The MySaturn Study aims to assess whether this therapy modifies the ultrasound appearance of myometrial lesions over 12 months. The study also tracks symptom changes and adverse events. It involves 111 premenopausal women in a monocentric ambispective observational design, combining retrospective and prospective data from July 1, 2023. The study spans 3 years (2 years of enrollment + 1 year follow-up) and uses routine clinical, laboratory, and imaging data for analysis. Adverse events will be monitored and reported in accordance with national pharmacovigilance regulations.