CD47 and breast cancer: Our finding that infiltrated CD11b+ macrophage and its phagocytosis on tumor cells were more enhanced in the dual inhibition of CD47 and HER2 and anti-CD47 inhibited HER2-mediated proliferation which is agreed with the finding that knockdown or antibody blockade of CD47 or SIRPα is effective in eliminating trastuzumab-adaptive HER2-expressing BC cells58.