IL2 and Behcet disease: Patients with BD had higher mean EC50 values in both the IL2 assay and GILZ assay compared with healthy controls (mean IL2 EC50 (95% CI): 10.80 (7.91–14.15) nM in BD vs 3.48 (2.16–5.10) nM in HC, P<0.001; mean GILZ EC50 (95% CI): 12.16 (10.91–13.42) nM in BD vs 8.13 (6.69–9.58 nM) in HC, P<0.001) indicating decreased in vitro GC sensitivity in BD (Fig. 1).