Résumé
Irradiation induced tumorigenesis is a complicated process involving several phases such as initiating, promoting and progressing, just like the tumorigenesis induced by other factors. While irradiation induced tumorigenesis has its particularity on molecular mechanism, though the precise process remain unclear. Generally, irradiation can cause serious damage on DNA, which may bring irreversible consequences. For example, the double strand breaks (DSB) can induce the mismatch repair reaction, resulting in mutation of some specific genes or chromosomes in irradiated cells. The mutagenesis then make for the activation of oncogene, inactivation of tumor suppressor gene, uncontrolled cell proliferation and alterations of signal transduction pathway, all these work together to promote tumorigenesis. In addition, the gene instability, cytoplast mutation and cell group by stand effects induced by irradiation also play crucial roles in the process of tumorigenesis. [