FNDC5 and myotonic dystrophy type 2: Though total and segmental lean masses, as well as cardiac left ventricular mass, did not show any significant correlation with plasma irisin levels in DM2 patients (Table 1; Table S1 in Supplementary Material), total fat mass (Figure 3A), and fat mass at arms and legs levels positively correlated with plasma irisin levels (Table 3).