Analyzing the expression levels of BAFFR, TACI, BCMA, BAFF, and APRIL relative to B2M transcripts, we found that BAFFR and BCMA transcripts are expressed by B-ALL cells (n = 63), although at lower levels compared to primary B-cells or EBV lines, while TACI seems to be expressed only at background levels (Figure 1A). This evidence concerns the gene B2M and acute lymphoblastic leukemia.