TGFB1 and systemic lupus erythematosus: There was no correlation between TGF-β1 AI and calculated LDL levels in control patients (Pearson r = 0.209, P = 0.243; Figure 2a), but there was a significant inverse correlation between the TGF-β1 AI and fasting LDL-cholesterol in patients with SLE (Pearson r = -0.404, P = 0.022; Figure 2a).