CD38 and Miyoshi myopathy: Although patients with relapsed/refractory MM (RRMM) commonly receive triplet/combination therapy [6, 7], novel agents such as daratumumab, a CD38-targeting IgG1Κ human monoclonal antibody, and carfilzomib have demonstrated efficacy as monotherapy in these patients and are approved for such use in the United States [8, 9].