However, the SSAO activity of sVAP-1 showed a decreasing trend across the MetS groups (CTRL: 106 ± 28; pre-MetS: 96 ± 24; MetS: 93 ± 21 nmol benzaldehyde mg−1 (plasma protein) h−1; pANOVA = 0.033; CTRL vs. Mets: p = 0.034). The gene discussed is AOC3; the disease is metabolic syndrome.