*Data presented as Mean ± SD. t test, **Data presented as number (%). Mann-Whitney test. OHSS: Ovarian hyperstimulation syndrome, BMI: Body mass index, LH: Luteinizing hormone, TSH: Thyroid stimulating hormone, AMH: Anti-Mullerian hormone, FSH: Follicle-stimulating hormone, PCOS: Polycystic ovarian syndrome, IVF: In vitro fertilization. This evidence concerns the gene BRD2 and ovarian hyperstimulation syndrome.