Correlation between CD86⁺ and HLA-G⁺ expression on BM T cells and plasma cells. (A) Increased expression of CD86 on BM T cells (mean = 10.5%) compared with peripheral blood T cells (mean = 3.9%) of patents with MM (U = 2873; P < .0001) and the increased expression of HLA-G on BM T cells (mean = 1.25%) compared with peripheral blood T cells (0.5%; U = 1216; P < .0001). (B) Correlation between expression of CD86 on BM T cells and BM CD38⁺⁺ cells (r = 0.67; P < .001; n = 29). (C) Correlation between expression of HLA-G on BM T cells and BM CD38⁺⁺ cells (r = 0.82; P < .001; n = 29).