IL2 and systemic lupus erythematosus: The meta‐analysis of the proportion of Treg cells showed that patients with SLE had a higher proportion of Treg cells after receiving LD‐IL‐2 compared with these patients before treatment (SMD = 1.096, 95% CI: [0.544, 1.649], p < .001) (Figure 3F), while there were no statistical differences in the proportions of Th17 cells (SMD = 0.315, 95% CI: [−0.297, 0.926], p = .313) (Figure 3E), Th1 cells (SMD = −0.454, 95% CI: (−2.309, 1.400), p < .001) (Figure 3C) and Th2 cells (SMD = 0.102, 95% CI: (−0.116, 0.321), p = .358) (Figure 3D) before and after LD‐IL‐2 treatment.