Figure 4

Overall survival (OS) rates according to (a) radiotherapy for low‐risk patients (radiotherapy vs. non-radiotherapy, P = 0.100) and (b) radiotherapy for high‐risk patients (radiotherapy vs. non-radiotherapy, P = 0.009). Pictures show the number of subjects at risk in each group at 20-month increments. Pictures show the number of censoring in each group at 20-month increments.