Fig. 7From: The trade-off of post-mastectomy radiotherapy usage for the breast cancer patients aged 70 years or older: a study based on SEER databaseKaplan-Meier curves for comparing the overall survival of patients in (A) three risk groups, (B) low-risk group, (C) moderate-risk group, and (D) high-risk group. These risk groups were divided from the entire cohort by the optimal cut-off values calculated using X-tile. PMRT: post-mastectomy radiotherapyBack to article page