Low-dose RT elevates tumor DR scores to levels exhibited by excellent patient survivors. (A) DR score of tumor cells subjected to sham (0 Gy RT) or low-dose (1.8 Gy) RT grouped into the following 3 categories: low DR score (the average baseline, unirradiated sample), high DR score (the average DR score 1 day after low-dose RT), and medium DR score (between low and high). (B) Overall survival of patients based on the DR grouping in panel A charted over time with nonresponder (NR) and complete responder (CR) time of death or last follow-up charted in red and blue squares, respectively. (C) Overall survival of patients broken down by RT-defined low, med, and high DR scores from panel A.