IFN-γ levels in AOSD patients (50.5 ± 34.4 pg/mL) were higher than those in RA patients (27.7 ± 21.4 pg/mL; p = 0.001) and HCs (23.7 ± 11.1 pg/mL; p < 0.001). The gene discussed is IFNG; the disease is adult-onset Still disease.