DKK1 and systemic lupus erythematosus: Unexpectedly, there was no association between serum and urine in SLE patients determined for Wnt-3A (r = 0.159, p = 0.0955, and N = 111), FZD-8 (r = −0.0892, p = 0.3518, and N = 111), and DKK-1 (r = −0.0246, p = 0.7976, and N = 111) (Figure 3).