Results No differences were determined between the groups regarding the baseline parameters (age, age subgroups [20–29, 30–39, and ≥ 40 years old)], body mass index (BMI), smoking status, infertility period, cause of infertility, baseline follicle stimulating hormone, luteinizing hormone, estradiol (E2), thyroid stimulating hormone, prolactin levels, antral follicle count, duration of stimulation, stimulation protocol, gonadotropin dose required, maximum E2levels, progesterone levels, endometrial thickness on human chorionic gonadotropin (hCG) administration and transfer days (p > 0.05). This evidence concerns the gene PRL and Infertility.