Table 4.

Comparison of different models for OS prediction in the SEER cohort

Model	C-index	95% CI
Age + Sex + AJCC stage + Histologic grade	0.79	0.74–0.83
Age + Sex + AJCC stage + Histologic grade + LNR	0.79	0.74–0.83
Age + Sex + Histologic grade + LNR + Size	0.77	0.73–0.82
AJCC stage only	0.71	0.67–0.75
ENETS stage only	0.70	0.65–0.74
Histologic grade only	0.72	0.67–0.74

Abbreviations: C-index, concordance index; CI, confidence interval; OS, overall survival.