Lower AF apoA-II levels correlated with lower AF protein (rs = 0.483, P < 0.001), reduced AF albumin (rs = 0.467, P < 0.001), and higher serum bilirubin (rs = − 0.364, P = 0.005), with a non-significant trend towards correlation with platelets (rs = 0.219, P = 0.096). The gene discussed is APOA2; the disease is atrial fibrillation.