Receiver operating characteristic curves of total fibrocytes (panel A), α-smooth muscle actin + fibrocytes (panel B), Thrombolysis in Myocardial Infarction (TIMI) risk score (panel C), and N-terminal of the pro-hormone brain natriuretic peptide (NT pro-BNP, panel D) to predict recurrent angina at one year in subjects with unstable angina. A-SMA, alpha-smooth muscle actin; AUC, area under the curve; Col1, collagen-1.