Eventually, 52 patients [23 Female, 29 Male; Mean age: 61 years (range 40–81 years); Isotype: IgA (12), IgG (32), Micromolecular (2), Non secretory (6)] were included in the study because of diagnosed with active multiple myeloma due to IMWG criteria (MM, 47) or presence of clinic lab data compatible with relapse-refractory MM (RR, 5). Here, CD79A is linked to Miyoshi myopathy.