This could also be due to the fact that CD47 blockade allows preferential phagocytosis of cancer cells by macrophages [1,2] so it might not be solely radiation

This could also be due to the fact that CD47 blockade allows preferential phagocytosis of cancer cells by macrophages [1,2] so it might not be solely radiation sensitivity that is leading to the clearance of the tumor cells. [1] http://www.ncbi.nlm.nih.gov/pubmed/19632179 http://www.ncbi.nlm.nih.gov/pubmed/19632179 [2] http://www.ncbi.nlm.nih.gov/pubmed/19632178 http://www.ncbi.nlm.nih.gov/pubmed/19632178