Figure 4
No prognostic value of intratumoral CD8 + T cells in head and neck cancer. Tissue sections derived from biopsies of head and neck cancers were stained with the anti-CD8 antibody by simple immunofluorescence analysis. For overall survival analysis (A) and disease free survival analysis (B), high and low levels of these populations were defined as low (≤ 20% positively stained tumor cells) versus high (> 20% positively stained cells).