Figure 3.

Magnification ×400, 0.19 mm² area, immunostaining with the anti-CD31 antibody. (A) High MVD in primary PDAT section. Single small arrows indicate single red-stained microvessels. Double small arrows indicate a single red-stained microvessel with a red blood cell in its lumen as a positive internal control. Single big arrows indicate tumour epithelium. Double big arrows indicate a vessel with a lot of tumour cells in its lumen. (B) Low MVD in ANT section. Small arrows indicate a single red-stained microvessel. The big arrow indicates normal pancreatic epithelium. Scale bar corresponds to 125 µm. MVD, microvascular density.