Complete, partial or no renal response.Urinary PCR, serum C3 level, serum CH50 value, anti-dsDNA antibody, serum creatinine, ECLAM index (SLE disease activity), prednisolone dose–Measured at baseline, 3, 6, 12, 24 and 36 months and last visit. This evidence concerns the gene C3 and systemic lupus erythematosus.