CD47 and breast cancer: Remarkedly, compared to the lack of basal and induced CD47 in the normal human breast epithelial MCF10A cells that do not express HER2, CD47 expression was noticeably enhanced in BC and other human cancer cell lines even in the MCF7 cells in which a slightly elevated HER2 was detected (Fig. 2e) as well as in the counterpart xenograft tumors treated by in vivo radiation (Fig. 2f).