Data of resected pT1N0M0 EC patients between 1988 and 2015 were extracted from the United States Surveillance, Epidemiology, and End Results (SEER) database. 
SEER
Factors that may predict the outcome were identified using the Kaplan-Meier method and the Cox proportional-hazards model.



Kaplan-Meier method
Factors that may predict the outcome were identified using the Kaplan-Meier method and the Cox proportional-hazards model.



Cox proportional-hazards model
X-Tile analysis showed that 12 was the optimal cutoff value for ELN count in terms of both OS (χ2 = 28.764, P < 0.0001) and ECSS (χ2 = 15.668, P = 0.0026). 
X-Tile analysis