The mean fluorescence intensity (MFI) of the DKK-1 related receptors on myeloma cells (B), SCs from healthy donors (A) and patients with MM (C) were (58.6 ± 17.2), (20.8 ± 8.4) and (104.5 ± 32.1), respectively (Fig. 5). The gene discussed is DKK1; the disease is plasma cell myeloma.