In the ROC curve analysis, TGF‐β levels >4877 pg/mL had a sensitivity of 71% and specificity of 75% in predicting adverse events in HCM patients (area under curve: 0.727, 95% CI: 0.567–0.887, P = 0.014). Abbreviations: CI, confidence interval; HCM, hypertrophic cardiomyopathy; ROC, receiver operating characteristic; TGF‐β, transforming growth factor‐β.