Baseline characteristics assessed included women’s age, BMI, basal E2, FSH, and P4 levels, infertility type and duration, type of fertilization, AFC, Gn dosage and duration, E2 and LH levels, P4 level on the HCG trigger day (HCG-T day), endometrial thickness, the number of oocytes retrieved, embryo type, and the number of two-pronuclear embryos. This evidence concerns the gene BRD2 and Infertility.