The levels of VEGF in the serum of EL-4 and E.G7-OVA tumour-bearing mice, in EL-4 and E.G7-OVA tumour homogenates and in extracts of EL-4 and E.G7-OVA tumour cells grown in vitro were measured by ELISA (see Materials and Methods section). Here, VEGFA is linked to neoplasm.