Patients with baseline prolactin levels below 10638.2 mIU/L (500 ng/mL) had a significantly higher likelihood of achieving normalized prolactin levels and adenoma disappearance than those with prolactin levels exceeding 10638.2 mIU/L (500 ng/mL) (33.8% vs. 12.9%, P = 0.03). The gene discussed is PRL; the disease is adenoma.