Serum RBP4 levels were four times higher in HD compared to C (176.9 ± 63.2 versus 39.2 ± 17.4 mg/L, P < 0.005; Figure 1(d)); furthermore, serum RBP4 levels were lower in HD with preserved residual diuresis compared to the anuric HD patients (141.3 ± 34.2 versus 212.5 ± 67.0 mg/L; P < 0.005; Figure 1(e)). Here, RBP4 is linked to Huntington disease.