XRCC6 and neoplasm: Moreover, mice treated with the DNA-damaging agent azoxymethane (AOM) and inflammation-inducer dextran sulfate sodium (DSS) for 80 days had an increased trend of Ku70 expression in CD324+ (also called E-cadherin) epithelial cells and a decreased trend of the expression of Ku70 in CD45R+ nonepithelial (myeloid) cells in the tumor tissue compared to the nontumor tissue on day 80 (fig.