Regarding lipid metabolic parameters, PCSK9 levels were positively associated with triglycerides in the whole cohort (r = 0.146, P < 0.001), and the correlation was stronger in DM patients than in non-DM patients (r = 0.214, P < 0.001; r = 0.111, P = 0.003; respectively). Here, PCSK9 is linked to diabetes mellitus.