The results indicated that the serum levels of CTSG in DM/PM patients were positively correlated with LDH, ESR, IgG, and IgA (Fig. 3a), NE showed positive correlation with CRP and IgM (Fig. 3b), and PR3 had positive correlation with CRP, ESR, IgG, and IgM (Fig. 3c). Here, CTSG is linked to dermatomyositis.