GADD45B and Waldenstrom macroglobulinemia: DTP3, in fact, could also distinguish between PCs from MM and Waldenström’s macroglobulinemia (WM) patients (Kyle and Rajkumar, 2009), in line with the GADD45B expression levels in these cells, whereas bortezomib could not (Figures 6A and 6B; Figure S6C).