CD4 and neoplasm: Flow cytometric analysis revealed that there was an increase in percentage of total CD3+ T cells and in CD8+/CD4+ T cell ratio in TUBO tumours from WT BALB/c mice compared to TUBO tumours from BALB/c-NeuT mice (Fig. 2C,D), suggesting that T cells may contribute to the tumour regression in WT BALB/c mice.