Quantitative evaluation of colorectal tumour vasculature using contrast-enhanced ultrasound: Correlation with angiogenesis and prognostic significance

Figure 2 Kaplan-Meier survival curves for disease-free survival according to contrast-enhanced ultrasound parameters, vascular endothelial growth factor expression, and microvessel density. A: Kaplan-Meier curve for peak intensity; B: Kaplan-Meier curve for time to peak; C: Kaplan-Meier curve for area under the curve; D: Kaplan-Meier curve for vascular endothelial growth factor; E: Kaplan-Meier curve for microvessel density. DFS: Disease-free survival; VEGF: Vascular endothelial growth factor; MVD: Microvessel density; TTP: Time to peak; AUC: Area under the curve; PI: Peak intensity.