On day 4 after RT, we observed a distinct upregulation of CD25, CD44 and the proliferation marker Ki67 on tumor-infiltrating CD8+ T cells preferentially in mice receiving 1 × 20 Gy, which contrasted with 3 × 8 Gy-treated and non-treated animals (Figures 1G and 1H). Here, IL2RA is linked to neoplasm.