Proposal and validation of a modified staging system to improve the prognosis predictive performance of the 8th AJCC/UICC pTNM staging system for gastric adenocarcinoma: a multicenter study with external validation

Table 3 Comparison of prognosis prediction performances of the 7th and 8th AJCC/UICC staging systems with the modified pTNM staging system

pTNM staging system	Figure	Log-rank χ²	Linear-trend χ²	Likelihood-ratio χ²	AIC
Training cohort
7th edition	3A	2236	1595	2251	56781
8th edition	3B	2295	1636	2283	56749
Modified	3C	2425	1727	2360	56672
External validation cohort
7th edition	3D	1917	1643	1870	84973
8th edition	3E	1941	1662	1884	84959
Modified	3F	1957	1674	1894	84949

AJCC/UICC American Joint Committee on Cancer/Union for International Cancer Control, pTNM pathological tumor-node-metastasis staging system, AIC Akaike information criterion

ISSN: 2523-3548