CD34 and neoplasm: The results indicated that the tumor xenografts in CNE2-EBV+DAY7 group had a large amount of classical angiogenesis, manifested by lots of lacuna (CD34+/PAS+) in these xenografts, and red blood cells were observed in some cavities, while there was only a small amount of vascular mimicry in the tumor xenografts of CNE2-EBV- and CNE2-EBV+DAY14 groups (Fig 7C).