IL2 and systemic lupus erythematosus: Results showed that the levels of sIL-2Rα in SLE patients were positively correlated with the SLEDAI (r = 0.4149, p < 0.0001) (Figure 2C), and negatively correlated with the levels of serum IL-2 (r = -0.4098, p < 0.0001) (Figure 2D).