MYC and Miyoshi myopathy: LC-only MM was observed in 33% of our patients, and unfavorable cytogenetics (t(4;14), t(14;16), t(14;20), del17p, hypoploidy, c-myc, or chromosome 1 aberrations) was present in 44%, while according to the International Myeloma Working Group (IMWG) criteria (del17p, t(14;16), t(4;14)), it was present in only 7%.