CD79A and Miyoshi myopathy: SMM shows a higher tumor load than MGUS, with serum monoclonal protein (IgG or IgA) ≥ 30 g/L or urinary monoclonal protein ≥ 500 mg/24 h and/or clonal bone marrow plasma cells 10–60%, but lacks features for symptomatic MM including the so-called SLiM-CRAB criteria following the updated IMWG definitions [60].