CD4 and neoplasm: Furthermore, our flow cytometric analysis of the infiltrate at the human endpoint of the experiment showed that T cells are more abundant in the infiltrate in non-irradiated tumours (CD4+ 14 ±11%; CD8+ 19 ±14%) as compared to irradiated tumours (CD4+ 5 ±2%; CD8+ 8 ±11%) (S7C and S7D Fig).