Schematic representation of the mechanism(s) of action of anti-CD38 monoclonal antibodies on plasma cells. NK cell, natural killer cell; ADCC, antibody-dependent cell-medicated cytotoxicity; CDC, complement-mediated cytotoxicity; ADCP, antibody-dependent cellular phagocytosis; cADPR, cyclic adenosine diphosphate ribose; NAD+, nicotinamide adenine dinucleotide. Adapted from Morandi et al (33)., originally published in Frontiers in Immunology (copyright owner Frontiers Media S.A.) as per the Creative Commons Attribution License (CC BY).