TNF and breast carcinoma: As found in the mRNA screening, the level of TNF was not significantly different between the three tumour xenografts, IFNγ was high in xenografts of breast carcinoma SKBR7 and very low in the two colorectal carcinomas DLD1 and HCT116, whereas VEGF-A was high in the colorectal tumour xenografts and low in breast carcinoma.