ID3 and systemic lupus erythematosus: Our data showed that ID3 was highly expressed in SLE patients compared to that in normal controls (0.75 ± 0.09 vs 0 ± 0.11, P < 0.0001) and there was a positive correlation between ID3 expression level and SLEDAI score (r = 0.76, P < 0.0001) (Figure 4b, c).