GNRH1 and uterine corpus leiomyoma: Subgroup analysis was performed for patients with uterine fibroids ≥3 cm in diameter; the results presented in Table 4 show that the endometrial thickness on luteal support day is significantly different between the GnRH-a–HRT group and the HRT group (1 (0.9~1.2) vs. 0.88 (0.83~1) s 0.93 (0.85~1.1), p = 0.028).