UMOD and systemic lupus erythematosus: We compared serum uromodulin levels defined by the SLICC renal activity score among the following three subgroups: A) SLE patients with a SLICC renal activity score equal to 0 points (n = 63); B) SLE patients with SLICC renal activity score from 1 to 4 points (n = 23); and C) SLE patients with SLICC renal activity score ≥ 5 points (n = 28).