This study is the first quantitative analysis of the expression levels of four CT antigen genes, MAGE-C1/CT7, MAGE-A3, MAGE-C2/CT10 and SSX-2, in bone marrow cells from MM patients using qPCR to investigate the correlation between CT antigen expression levels and various clinical characteristics in MM. The gene discussed is MAGEA3; the disease is Miyoshi myopathy.