TNFRSF13B and acute lymphoblastic leukemia: Analyzing the cell surface expression of BAFFR, TACI, and BCMA on B-ALL cells from 12 patients (data for BCMA expression were available for 7/12 patients), we found that B-ALL cells of 8/12 patients expressed BAFFR, although at lower levels than mature B cells from the same patients (Figure 2).