FLT4 and neoplasm: It is reported tumor‐associated macrophages, mast cells and basophils promote lymphangiogenesis by regulating VEGFC‐VEGFR3 signaling.[10, 11, 12, 13, 14] Thus, investigating how tumor‐associated immune cells regulate lymphangiogenesis provides prognostic markers and therapeutic targets for LN metastasis of BCa.