VEGFA and neoplasm: Vascular endothelial growth factor is constitutively expressed by murine 4T1 and human MDA-MB-231 tumour cells (4T1, 59.10±1.87 pg VEGF perμg protein; MDA-MB-231, 20.56±1.51 pg VEGF per μg protein, Pidgeon et al, 2001).