TNFRSF17 and Miyoshi myopathy: We did not find significant correlation between the bone marrow BCMA expression and the patients’ serum β2-MG (P>0.05), but results showed that the MM patients with high serum β2-MG had higher bone marrow BCMA expression than the patients with low serum β2-MG (rank average 28.89 vs 17.54, P=0.017), which makes sense.