VEGFA and neoplasm: We also demonstrate that macrophages are only required for graft vascularisation when the graft cells express VEGFA/vegfaa: in contrast to the VEGFA-expressing B16-F1 and MDA-MB-231 tumour xenografts, in either Fluosphere or HEK-293T grafts, which respectively express either no VEGFA or low levels of VEGFA, macrophages had no detectable role in graft vascularisation.