FABP4 and metabolic syndrome: Circulating FABP4 concentration is known as a biomarker for several disorders; increased circulating FABP4 concentrations are associated with the increased risk of various diseases, such as atherosclerosis [7, 8], insulin resistance [9], type 2 diabetes [10], hypertension [9, 11], dyslipidemia [9, 12], cardiovascular diseases [13, 14], and cancer [15].