TNFSF14 and Miyoshi myopathy: However, MM patients with light-chain M-protein type tended to have a significantly higher sFLC ratio compared to that of subjects with IgG/IgD/IgA M-protein types (mean ± SD, 1048 ± 1502 vs. 82.2 ± 217.9 vs. 9.65 ± 9.32, light chain vs. IgG vs. IgD/IgA; p = 0.0053).