Weight-Loss and Metformin-Use Improve the Reversal Rate in Patients with Endometrial Hyperplasia.

Objective: To evaluate the therapeutic outcomes of weight loss and metformin use in patients with endometrial hyperplasia (EH), and to identify the factors influencing treatment efficacy. Methods: This study included data from patients diagnosed with either EH or endometrial atypical hyperplasia (EAH). Patients selected a progestin treatment regimen based on their diagnosis. Those with concurrent obesity or insulin resistance received additional weight management support and metformin therapy. Follow-up assessments were conducted every 3-6 months. Results: A total of 202 patients were included. The metformin group exhibited significantly greater improvement in abnormal uterine bleeding (91.5% vs 57.1%, p < 0.001) and in ultrasound findings (91.5% vs 66.7%, p < 0.001) than the non-metformin group. Patients who achieved >3% weight loss and those using metformin showed a significantly higher rate of disease reversal than those with ≤3% weight loss (91.2% vs 77.6%, p = 0.034) and the non-metformin group (93.2% vs 52.4%, p < 0.001). At follow-up durations exceeding 12 months, metformin use was associated with a significantly higher disease reversal rate (82.1% vs 42.9%, p = 0.048) and a lower recurrence rate (12.8% vs 28.6%, p = 0.048). Weight loss of >3% (odds ratio: 0.041, 95% confidence interval: 0.004-0.437, p = 0.008) and metformin use (odds ratio: 0.059, 95% confidence interval: 0.011-0.311, p = 0.001) were both independently associated with improved reversal rates in patients with EH/EAH. Conclusion: Combining progestin therapy with weight loss and metformin is more effective in reversing EH than progestin alone. Regular metformin use, alongside weight loss, serves as a protective factor in EH management, with the protective effect of metformin increasing with longer use.