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Time-dependent receiver-operating characteristic curve (ROC) and calibration curves of the nomogram. Time-dependent ROC of overall survival for patients with stage IV colorectal cancer in the training cohort (A), internal validation cohort (B) and external validation cohort (C). Calibration curves of 3- and 5-year overall survival for patients with stage IV colorectal cancer in the training cohort (D, G), internal validation cohort (E, H), and external validation cohort (F, I).
