IGF2 and neoplasm: Histological examination revealed that the tumor had well-differentiated blood vessels containing endothelial cells (Fig. 5A-C), which were positive for cluster of differentiation (CD) 31 and CD 34 (Fig. 6A and B) but negative for D2–40, glucose transporter 1 (GLUT-1) (Fig. 6C and D), vascular endothelial growth factor A, insulin-like growth factor 2 (IGF-2) and pericytic elements.