CXCL13 and systemic lupus erythematosus: In patients with SLE, levels of CCL8 and levels of IL-1RA displayed the strongest albeit weak correlation (ρ=0.37, p<0.001), followed by CXCL13 and IL-1RA levels (ρ=0.34, p<0.001), and CCL8 and CXCL13 levels (ρ=0.28, p=0.003), as illustrated in Figure 3J.