CD40LG and B-cell chronic lymphocytic leukemia: Flow cytometric analysis showed that the VDR was significantly induced by co-stimulation with anti-IgM/CD40 ligand in U-CLL (n = 6, FD: 1.6, p < 0.05) (Figure 4A), while no changes were observed in M-CLL (n = 4; Figure 4B).