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. 2021 Nov 3;11:754180. doi: 10.3389/fonc.2021.754180

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Copyright © 2021 Shen, Wang, Zhang, Li, Li, He, Xue, Wang, Li, Liu, Zhang, Gu, Wang, Wang, Shi, Ye, Zhu, Miao, Huang and Sang

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 optimal cutoff point for age was found to be 74 years using the MaxStat method, which distinguished two prognostic groups most effectively (P < 0.0001).