CD34 and nasopharyngeal carcinoma: This observation was further substantiated by an in vivo xenograft model, where NPC cells cocultured with HUVEC-SELE-MUT exhibited increased tumorigenesis, as evidenced by augmented tumor volume and weight (Figure 8, F–H) along with enhanced angiogenesis as indicated by CD34 staining indicative of vessel formation (Figure 8I).