Fig. 2

The overall survival (OS) and cancer-specific survival (CSS) curve of younger and older patients. A Kaplan-Meier survival curve of OS using unadjusted data in the Surveillance, Epidemiology, and End Results (SEER) data set. The 5- and 1-Year OS rates were 86.4 and 78.2%, respectively, and 72.8 and 54.5%, respectively (P < 0.001). B Kaplan-Meier survival curve of CSS Using unadjusted data in the SEER data set. The 5- and 10-Year OS rates were 89.4 and 81.7%, respectively, and 84.3 and 72.8%, respectively (P < 0.001). C Kaplan-Meier survival curve of OS using propensity score matching adjusted data set. The hazard ratios of OS using univariate analysis in the matched cohort were 2.056(95% CI,1.948–2.170; P < 0.001). D Kaplan-Meier survival curve of CSS using propensity score matching adjusted data set. The hazard ratios of OS using univariate analysis in the matched cohort were 1.496(95% CI,1.399–1.600; P < 0.001). The P values were calculated using the cox model