We included 28 relapsed/refractory myeloma patients, who were treated with DARA....Before treatment, the absolute number of CD38-positive Treg cells was significantly higher in responders (median, 10.9/µl; range, 5.1-37.3/µl) than in non-responders (median, 4.8/μL; range, 1.1-12.8/µl, p = 0.02)…