The average of mean number of gamma-H2AX foci per nucleus in irradiated lymphocytes and negative controls of 20 patients per group is shown (3D and SSIMRT). Standard errors are shown. All patients were irradiated upon their prostate region, whereas venous blood was taken before (control) and 10 minutes after their first irradiation fraction. Lymphocytes were fixed 2 h after the end of the irradiation. In the negative control 50 lymphocytes were analyzed per patient, while in the irradiated samples, 300 lymphocytes were analyzed per patient.