CXCL12 and neoplasm: Mɸ are recruited into irradiated tumour tissue at both acute and late stages through Mø/Mɸ chemoattractants CCL2, CCL5, CCL7, CCL8, CXCL12, VEGF and CSF-1 (Kioi et al. 2010; Kozin et al. 2010; Sica et al. 2008; Xu et al. 2013).