The three groups were similar in age at oocyte pick up (OPU), infertility duration, BMI, basal FSH, basal LH, hydrosalpinx laterality, duration of ovarian stimulation, total units of gonadotropin usage, number of retrieved oocytes, HRT/natural transfer cycle ratio, endometrial preparation duration and endometrial thickness (P > 0.05). The gene discussed is BRD2; the disease is Infertility.