Fig. 6From: The trade-off of post-mastectomy radiotherapy usage for the breast cancer patients aged 70 years or older: a study based on SEER database(A) Nomogram and its calibration curves of (B) 1-, (C) 3-, (D) 5-years OS for non-PMRT patients. Blue line: calibration curves in the training cohort; Red line: calibration curves in the validation cohort. ER: estrogen receptor; PR: progesterone receptor; OS: Overall survivalBack to article page