Although no statistical significant difference in serum IFNα2 concentration was observed between total TB and sarcoidosis groups (Fig. 1A), patients with TBU had significantly lower serum IFNα2 concentrations (median = 0.05 pg/mL) than that in patients with SU (median = 34.70 pg/mL; p = 0.004; Fig. 1B). Here, IFNA2 is linked to sarcoidosis.