107 patients had a diagnosis of IgG MM (71 IgG κ and 36 IgG λ), 56 patients IgA MM (28 IgA κ and 28 IgA λ isotype) and 27 patients had a diagnosis of light chain multiple myeloma (LCMM), of which 13 with expression of κ light chain and 14 with λ light chain. The gene discussed is CD79A; the disease is Miyoshi myopathy.