Journal of Clinical Medicine Review Novel Approaches to Improve Myeloma Cell Killing by Monoclonal Antibodies Paola Storti 1,* , Federica Costa 1, Valentina Marchica 1, Jessica Burroughs-Garcia 1,2, Benedetta dalla Palma 1, Denise Toscani 1, Rosa Alba Eufemiese 1 and Nicola Giuliani 1 1 Department of Medicine and Surgery, University of Parma, 43126 Parma, Italy;
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[email protected] (N.G.) 2 Department of Medical-Veterinary Science, University of Parma, 43126 Parma, Italy * Correspondence:
[email protected]; Tel.: +39-0521-033303 Received: 11 August 2020; Accepted: 31 August 2020; Published: 4 September 2020 Abstract: The monoclonal antibodies (mAbs) have significantly changed the treatment of multiple myeloma (MM) patients. However, despite their introduction, MM remains an incurable disease. The mAbs currently used for MM treatment were developed with different mechanisms of action able to target antigens, such as cluster of differentiation 38 (CD38) and SLAM family member 7 (SLAMF7) expressed by both, MM cells and the immune microenvironment cells. In this review, we focused on the mechanisms of action of the main mAbs approved for the therapy of MM, and on the possible novel approaches to improve MM cell killing by mAbs. Actually, the combination of anti-CD38 or anti-SLAMF7 mAbs with the immunomodulatory drugs significantly improved the clinical effect in MM patients. On the other hand, pre-clinical evidence indicates that different approaches may increase the efficacy of mAbs.