In R-RA patients, but not in NR-RA patients, the percentage of Treg CD39+CD73− cells displayed a negative correlation with DAS28 (r = −0.589 and p = 0.006), SDAI (r = −0.447 and p = 0.04), and CDAI (r = −0.450 and p = 0.04). The gene discussed is NT5E; the disease is rheumatoid arthritis.