Plasma analysis of serpin B3 by an immunoassay for squamous cell carcinoma antigen (SCC), which detects both serpin B3 (SCCA1) and serpin B4 (SCCA2), did not unravel any significantly different concentrations between controls (0.45±0.27 ng/L, n = 15), ACS (0.60±0.54 ng/L, n = 13) and stable CAD patients (0.57±0.29 ng/L, n = 15). Here, SERPINB4 is linked to coronary artery disorder.