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Overall survival of the training set based on two staging systems. (A) Kaplan-Meier overall survival for the training set according to 8th edition AJCC ypTNM stage, with the addition of ypT0N0 and ypT0N+. (B) AJCC ypTNM staging system and modified ypTNM staging system. (C) Kaplan-Meier overall survival for the training set according to modified ypTNM stage.
