Babić et al: B regulatory cells and monocyte subpopulations in chronic graft-versus-host disease www.cmj.hrAim To assess the correlations of B regulatory cells (Bregs) and monocyte subsets in peripheral blood with the National Institutes of Health (NIH)-consensus-defined clinical manifestations of chronic graft-vs-host disease (cGvHD), in an attempt to establish their role as cellular biomarkers.Methods This multidisciplinary prospective study enrolled adult cGVHD patients treated in the