Fig. 6

a and b are a histological photomicrographs (hematoxylin and eosin × 40) and CD34 immunohistochemical staining (×200) of a DLD-1 tumour, respectively. In a, packed tumour cells with little interstitium (black arrow) and discrete necrosis (white arrow) are shown. In b, black arrows point to sparse microvessels. c and d are a histological photomicrograph (haematoxylin and eosin × 100) and CD34 immunohistochemical staining (×200) of a SW620 tumour, respectively. In c, relatively little interstitium (white arrow) is noted in packed tumour cells. In d, white arrows indicate sparse microvessels