The numbers of CD3+CD8+ positive cells and levels of IL-2 and IFN-γ were slightly reduced and T lymphocyte apoptosis rate was slightly elevated in peripheral bloods and tumor tissues of the miR-21+/+ mice following radiotherapy in contrast to the WT mice following radiotherapy (Figures 2(c)–2(f)). The gene discussed is IFNG; the disease is neoplasm.