The receiver operating characteristic curve analysis of plasma intermedin levels for 5-year mortality in breast cancer patients. Receiver operating characteristic curves were constructed based on the sensitivity and specificity of plasma intermedin levels for identifying 5-year mortality. Area under curves was calculated based on the receiver operating characteristic curves and expressed as 95% confidence interval. Area under curve ranges from 0.5 to 1.0. An area under curve closer to 1 indicates a higher predictive power.