ROC (receiver operating characteristic) curves for classifiers based on single gene methylation. A solid line was plotted for discovery phase sets comprising 14 BPH samples and 30 cancerous prostate samples (with low and high dysplastic cell content, respectively). A dashed blue line was plotted for BPH samples compared with 26 adjacent non-cancerous prostate samples. A dotted red line was plotted for a validation set of samples consisting of 131 and 59 patients histologically diagnosed with PCa and BPH, respectively. AUC values are given in the same order. The full colour version of this figure is available at British Journal of Cancer online.