Figure 4: Elevated serum GITRL levels in SLE patients with organ damage. (a) Serum GITRL levels exhibited elevation in SLE patients with renal involvement ( ) relative to patients without renal involvement ( ) as well as HC. (b) Serum GITRL levels were higher in SLE patients with vasculitis ( ) than patients in the absence of vasculitis ( ) as well as HC. Each symbol represents an individual patient; horizontal lines indicate median values. GITRL: glucocorticoid-induced TNFR-related protein ligand; HC: healthy control; SLE: systemic lupus erythematosus.