MSTN and dermatomyositis: The comparison between subgroups showed that ASyS and DM inactive patients had higher myostatin levels compared to their active counterparts (3611 [2910; 4603] pg/ml vs 2407 [1420; 3366] pg/ml; p = 0.0004, and 2618 [1690; 3749] pg/ml vs 1697 [1227; 2606] pg/ml; p = 0.0005, respectively) (Figure 4).