The ph‐parameters of DCE‐MRI data and the MVD counts of CD31 stained data are strongly affected by the definition of the tumor ROI.(19) Inclusion of voxels in the CNA artificially lowered the mean of the values, whereas inclusion of the voxels in VTA artificially increased the mean of the values while ignoring tumor heterogeneity. Here, PECAM1 is linked to neoplasm.