Within sarcoidosis patients, the proportions of PD-1+ Tregs showed a positive correlation with the proportions of PD-1+CD4+ Tm cells (r = 0.68 p < 0.001), and an inverse correlation with CD25+CD4+ Tm cells (r = -0.53 p < 0.05) (Fig. 3C). Here, IL2RA is linked to sarcoidosis.