Even though differences in ex vivo IFN-γ production were not observed between patients with inactive SLE and those with RA, patients with RA had lower ex vivo IFN-γ production than healthy controls (RA median 13.78 IU/mL (IQR 9.64–16.99 IU/mL) vs. healthy controls 14.60 IU/mL (IQR 12.34–18.33 IU/mL); p < 0.01, Fig. 1a). This evidence concerns the gene IFNG and rheumatoid arthritis.