Supplementary Table 1. CLL Patient characteristics. Supplementary Table 2. Healthy donor characteristics. Supplementary Table 3. MM patient characteristics. Supplementary Figure 1. γ-secretase inhibition increases BCMA levels but does not affect viability of B-cell malignancy cell lines. Supplementary Figure 2. γ-secretase inhibition does not affect viability CLL cells. Supplementary Figure 3. BCMAxCD3 DuoBody® induces activation, degranulation, and cytokine secretion by T cells in the presence of B cell malignancy cell lines. Supplementary Figure 4. BCMAxCD3 DuoBody® induces autologous killing of MM cells.