Pharmacy considerations: Use of anti-CD38 monoclonal antibodies in relapsed and/or refractory multiple myeloma.

Objective: This article reviews current evidence for the approved anti-CD38 monoclonal antibodies, isatuximab and daratumumab, for the treatment of patients with relapsed and/or refractory multiple myeloma (RRMM) and the implications for pharmacists.

Data Sources: We conducted a literature search on PubMed/Medline and other sources using the drug names and the terms CD38, multiple myeloma, and pharmacists.

Data Summary: Monoclonal antibodies targeting the CD38 transmembrane glycoprotein offer a promising treatment approach for patients with RRMM. Isatuximab and daratumumab bind to different epitopes on CD38. In this review, we describe the similarities and differences in their mechanism of action, regulatory labeling, and the current guidelines for isatuximab and daratumumab use in RRMM. We review the current evidence for the efficacy and safety of these agents in combination with pomalidomide or carfilzomib and dexamethasone from the landmark phase 3 clinical trials that led to their approval. We discuss key differences in the eligibility criteria between the clinical trials, and differences in dosing, administration, available formulations, and pre- and post-infusion medications for the two agents. We outline recent data from pharmacoeconomic analyses comparing the cost-effectiveness of isatuximab-based regimens with that of daratumumab-based regimens. A brief overview of other anti-CD38 agents in the pipeline for the treatment of patients with RRMM is presented.

Conclusions: Given that pharmacists play an integral role in driving cost-effective use of drugs without compromising efficacy and safety for the end user, educating pharmacists on the key differences between isatuximab and daratumumab can guide the selection of the appropriate anti-CD38 antibody.