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. 2019 Sep 19;9:906. doi: 10.3389/fonc.2019.00906

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Copyright © 2019 Wang, Jiang, Zheng, Yan, Dai, Huang, Zhang, Yin, Gong and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The principle diagram of modifying AJCC TNM staging system based on age: stage I patients under 60 years were classified as stage I in the modified staging system; stage II patients under 60 years and stage I patients older than 60 years were classified as stage IIA in the modified staging system; stage III patients under 60 years and stage II patients older than 60 years were classified as stage IIB in the modified staging system; stage IV patients under 60 years and stage III patients older than 60 years were classified as stage III in the modified staging system; stage IV patients older than 60 years were classified as stage IV in the modified staging system.