Correlation of serum IL-17 concentrations with serum IL-6 concentrations in SLE patients. (A) Correlation between serum IL-6 and serum IL-17 levels in all samples. There was a strong positive correlation (r = 0.618, P <0.0001). (B) Correlation between TAM serum IL-6 and TAM serum IL-17 levels. There was a strong positive correlation (r = 0.657, P <0.0001). (C) Correlation between changes in serum IL-6 (ΔIL-6) and IL-17 (ΔIL-17) levels between visits. There was a strong positive correlation between ΔIL-6 and ΔIL-17 (r = 0.2542, P <0.0001). Serum IL-6 and IL-17 levels are expressed in pg/ml. IL, interleukin; SLE, systemic lupus erythematosus; TAM, time-adjusted mean.