CD40LG and systemic lupus erythematosus: As illustrated in Fig 6, no correlation was found between SLEDAI scores of the SLE patients and total IgG, total IgA or total IgM concentrations, respectively (r-values of 0.247 (p = 0.102), 0.175 (p = 0.250) and 0.116 (p = 0.447), respectively).