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9%) patients when the 8 and 7 editions were compared. No statistically significant difference in survival was observed between T2aN0M0 and T2bN0M0. The C-index of the 8 edition was 0.609 [95% confidence interval (CI) 0.568-0.650], which was slightly higher than that of the 7 edition (C-index, 0.599, 95% CI 0.558-0.64. The time-dependent AUC value also corroborated that the 8 edition had a better performance than the 7 edition. The 8 edition of the AJCC staging system for pCCA showed a better ability than the 7 edition to discriminate patient survival. How