Additionally, the MM patients with low FCER1G expression were more likely to have a higher beta-2 microglobulin (B2M), creatinine (CREAT), aspirate plasma cells (ASPC) ,bone marrow biopsy plasma cells (BMPC) and lower hemoglobin (HGB), which were all important factors in MM prognosis (P< 0.001, = 0.038, < 0.001, < 0.001, = 0.006, respectively). Here, B2M is linked to Miyoshi myopathy.