The patients with overt NAFLD (grade 2 or 3) had a significantly higher serum FABP1 level than those with grade 1 NAFLD and normal subjects (34.5 ng/mL [IQR 29.6 to 57.1] vs. 29.8 ng/mL [IQR 23.4 to 46.5] vs. 26.6 ng/mL [IQR 20.2 to 38.5], respectively, P = 0.001). The gene discussed is FABP1; the disease is metabolic dysfunction-associated steatotic liver disease.