Plasma GH was higher in patients who did not taking neuroleptics (n = 96, 0.38 ng/ml [0.01–10.24]), compared to their matched controls (n = 58, 0.14 ng/ml [0.004–4.57], p = 0.001) and to HD patients who was taking neuroleptics (n = 121; 0.18 ng/ml [0.01–3.16], p<0.001). The gene discussed is GH1; the disease is Huntington disease.