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Kaplan-Meier survival curves for patients stratified using the 7th edition staging system. (a) Classified as all eight substages. (b) Classified as the four major stages. (a) 
, 0; 
, IA; 
, IB; 
, IIA; 
, IIB; 
, IIIA; 
, IIIB; 
, IIIC. (b) 
, 0; 
, I; 
, II; 
, III.
