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

Table 2 Correlations between contrast-enhanced ultrasound parameters and angiogenesis markers

Parameters	Pearson correlation coefficient (r)	P value
PI and VEGF	0.73	< 0.001
PI and MVD	0.75	< 0.001
TTP and VEGF	-0.68	< 0.001
TTP and MVD	-0.72	< 0.001
AUC and VEGF	0.71	< 0.001
AUC and MVD	0.74	< 0.001

PI: Peak intensity; VEGF: Vascular endothelial growth factor; TTP: Time to peak; MVD: Microvessel density; AUC: Area under the curve.