FABP4 and type 1 diabetes mellitus: Correlation analysis showed that serum FABP4 levels were inversely associated with fasting C-peptide (r = –0.274, P < 0.001, Figure 1B) but were positively associated with the titers of islet autoantibodies GADA (r = 0.234, P = 0.002) and IA-2A (r = 0.234, P = 0.002) as well as the quantity of islet autoantibodies (r = 0.219, P = 0.04) in patients with type 1 diabetes (Table 2).