TNF and Behcet disease: Exclusively in the BD group, it was observed a significant negative correlation (r=-0.4724) between the levels of HERV-W-env expression and serum IL-10 (Fig. 4A), as well as significant positive correlations between the HERV-W-env expression levels and TNF-α/IL-10 (r = 0.4868) (Fig. 4B) or IFN-γ/IL-10 (r = 0.4650) (Fig. 4C) ratios.