A severe or partial GHD was found in all HD patients (100%) and in 3 from the non-HD group (25%) (p=0.001), with mean GH peak levels of 8.00±5.64 μg/L versus 32.1±21 μg/L, respectively (p=0.003) (Figure 2, Table 2). The gene discussed is GH1; the disease is Huntington disease.