CD40LG and systemic lupus erythematosus: SLE patients had significantly higher titers of anti-EBV-EBNA1 IgG, anti-EBV-CA IgM, anti-EBV-EA(D) IgG, anti-EBV-EA(D) IgM antibodies than controls (p<0.001, p<0.001, p<0.001, and p=0.012, respectively), while the titer of anti-EBV-CA IgG antibodies was significantly higher in controls than in SLE patients (p=0.003).