The imaging group (4 mice each level, 4 dose levels) was injected with 4-8 MBq 99mTc-HYNIC-annexinV 24 hours after irradiation and imaged 1 hr post-injection, and the mice were sacrificed immediately after imaging for biodistribution analysis of annexin V. The observation group (4 mice each level, 2 dose levels) was only observed for tumor regression post-radiation. This evidence concerns the gene ANXA5 and neoplasm.