Fig. 3From: Development and external validation of nomograms to predict the risk of skeletal metastasis at the time of diagnosis and skeletal metastasis-free survival in nasopharyngeal carcinomaKaplan–Meier curves of SMFS for the three risk group stratifications. Nomogram risk group stratifications for the 33 and 66 percentiles are shown for the training cohort (a, c) and validation cohort (b, d). SMFS, skeletal-metastasis free survivalBack to article page