In the PDX model, the average number of Ki-67 positive cells in tumor tissue was reduced to 211 ± 8.2 in the DMA + radiation (25 mg/kg × 5 + 4 Gy × 5) group and 190.4 ± 9.3 in the radiation-only (4 Gy × 5) mice to as compared to the control (235.5 ± 3.5) group (Figure 5E). The gene discussed is MKI67; the disease is neoplasm.