To determine whether miR-301a deletion raises Runx3 expression in tumor-infiltrating immune cells, we isolated CD8+ T cells, CD4+ T cells, CD11b+ cells (including monocytes and macrophages), and CD11c+ cells (including dendritic cells), from B16 tumors developed in WT and miR-301a−/− mice. Here, RUNX3 is linked to neoplasm.