CD47 and neoplasm: To test whether reducing CD47 expression by knocking down NFKB1 would have an effect on tumour growth and increase phagocytosis of the cancer cells, we infected MCF7-Luc cells with turboRFP-control shRNA or turboRFP shRNA against NFKB1 and then injected these and uninfected control cells into NSG (immunodeficient) mice.