IFNG and rheumatoid arthritis: Specifically, blood samples from RA patients treated with Humira® expressed lower IFN-γ (0.15 ± 0.10, N = 11) compared to blood samples from other RA patients (0.29 ± 0.27; p-values ≤ 0.05) or even healthy controls (0.44 ± 0.24; p-values ≤ 0.05).