Radiation therapy also enhances protein degradation and intracellular peptide pools that increase T-cell receptor repertoire and diversity [19], increase expression of major histocompatibility complex type I for enhanced antigen presentation [20], and increase FAS (CD95)/FAS ligand (FasL) interactions leading to irradiation-induced cytotoxic T-cell mediated tumor apoptosis [21]. This evidence concerns the gene FAS and neoplasm.