Figure 1. Highly expressed VEGFR2(KDR) induces angiogenesis in HNSCC. (A, B) qRT-PCR and western blotting results for VEGFR2 in HIOEC and HNSCC cell lines (HN30, CAL27, and HN6) (C) Representative images of HN6 and HN30 subcutaneous tumors using immunofluorescence staining against CD31 and DAPI staining of nuclei. Higher angiogenesis was observed in the HN30 group, which has a higher VEGFR2 expression level. *P < 0.05, **P < 0.01, ***P < 0.001 versus the control.