Cyclin D1 expression was at its peak during the G0/G1 phase in the present study’s MM group, as expected.Cyclin D1 expression was significantly higher during theG0/G1 phase than during the S phase in the MM group (P< 0.01), and was higher during the G0/G1 phase than duringthe G2/M phase (P < 0.05). This evidence concerns the gene CCND1 and Miyoshi myopathy.