In tumor-associated macrophages (TAMs), SHP-2 binds to the signaling protein complex of growth factor receptor-bound protein 2/GRB2 associated binding protein-2 (GRB2/GAB2), which is induced by colony stimulating factor receptor under the stimulation of CSF-1, and promotes macrophage proliferation and M2-type polarization. Here, GAB2 is linked to neoplasm.