FLT4 and neoplasm: Furthermore, Vascular endothelial growth factor C (VEGFC), which could activate vascular endothelial growth factor receptor 3 (VEGFR3) to promote lymphangiogenesis, was used in combination with HAM to facilitate the reconstruction of tumor‐associated lymphatic vessels, thus to enhance the migration of DCs to TDLNs for better T‐cell activation.