It was also found that the anti-GAPDH autoantibodies were associated with increased serum IgG (r = 0.282, P = 0.001, Figure 2(b) and Table 2) and IgM (r = 0.177, P = 0.045, Figure 2(c) and Table 2) levels and decreased incidence of lupus nephritis (Figures 2(b) and 2(c) and Table 3). Here, GAPDH is linked to lupus nephritis.