Analysis of the total thymic cell population suggests insignificant changes in CCL17 (ligand for CCR4) and a modest decrease in CCL19 (ligands for CCR7) at day 25 but a drastic reduction in expression of CCL21 (ligands for CCR7) when comparing thymi harvested from tumor-bearing vs. control mice (Figure 3A). This evidence concerns the gene CCR7 and neoplasm.