FABP4 and type 1 diabetes mellitus: Consistently, the FABP4 mRNA expression in peripheral blood mononuclear cells (PBMCs) isolated from patients with type 1 diabetes was significantly higher than that from sex- and age-matched healthy individuals with NGT (Figure 1C), indicating that monocyte-derived FABP4 may contribute to the elevation of serum FABP4 in patients with type 1 diabetes.