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Kaplan-Meier survival curves for patients stratified by tumor “T” (a) and node “N” (b) classifications. Survival differences were analyzed using Cox regression models. (a) 
, T0; 
, T1; 
, T2; 
, T3; 
, T4a; 
, T4b. (b) 
, N0; 
, N1; 
, N2; 
, N3.
