BRD2 and ovarian hyperstimulation syndrome: Ovarian stimulation with gonadotropins is one of the therapies for PCOS infertile patients; however, because of the large number of small antral follicles that are sensitive to FSH (11), women with PCOS have a higher risk of multiple pregnancy and ovarian hyperstimulation syndrome (OHSS; (12)) in response to FSH treatment (13).