XRCC6 and neoplasm: Expression of Ku70 in primary tumours ranged from 48 to 95% (Mean±s.e.m.: 76.9±3.6) and from 51 to 98% (Mean±s.e.m.: 86.8±3.2) in residual tumours after RT (mean diff=9.91, s.d.=17.6, P=0.018) (Figure 1A).