SLE patients stratified according to their concentrations of CRP showed that SLE patients with high CRP (>1 mg/l)(n = 30) had significantly higher serum λFLC concentrations compared to the SLE patients with low CRP (<1 mg/l) (n = 15) (p = 0.057, p = 0.050 and p = 0.059, regarding concentrations of total FLC, λFLC and κFLC, respectively) (results not shown). Here, CRP is linked to systemic lupus erythematosus.