Relationships between initial plasma endothelin 1 concentrations and serum albumin concentrations following 1 month (n = 19; p = 0.05; r = −0.44) (Figure 11), 3 months (n = 19; p = 0.01; r = −0.54) (Figure 12), 6 months (n = 19; p = 0.007; r = −0.6) (Figure 13), and 1 year (n = 19; p = 0.04; r = −0.46) (Figure 14) of monitoring in the membranous nephropathy cohort were statistically significantly negative. Here, EDN1 is linked to membranous glomerulonephritis.