While elevated prolactin levels (hyperprolactinemia) can also be caused by other pituitary adenomas through increased intrasellar pressure, known as the stalk effect, or by hypothalamic dysfunction, medications, or various conditions such as pregnancy, liver cirrhosis, and hypothyroidism, these levels are usually well below the prolactin serum levels caused by prolactinomas [2]. The gene discussed is PRL; the disease is prolactin-producing pituitary gland adenoma.