XRCC6 and acute lymphoblastic leukemia: Ku70 protein level in T-ALL (with translocation or normal karyotype) was significantly higher than that in the normal control (Fig. 6a, b, P = 0.002 and P = 0.041 respectively), and Ku70 protein level in the translocation group was significantly higher than that in normal karyotype group (Fig. 6a, b, P = 0.009).