Fig. 3From: Analysis of prognostic factors for survival in patients with primary spinal chordoma using the SEER Registry from 1973 to 2014Kaplan–Meier estimated overall survival in spinal chordoma patients, stratified by different diagnostic age groups (0- to 20-year-old age group vs 21- to 59-year-old age group vs over 60-year-old age group)Back to article page