After adjusting for female age, infertility duration, whether primary infertility, basal FSH level, basal LH level, basal E2 level, E2 level on HCG injection, and transplantation day endometrium, the increase in progesterone levels on the day after HCG injection has no effect on the live birth rate (Table 4). This evidence concerns the gene BRD2 and Infertility.