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. 2021 May 12;11:650266. doi: 10.3389/fonc.2021.650266

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Copyright © 2021 Wei, Gu, Song, Zhang, Wang, Xu, Yu and Shi

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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(A) Comparison of the 1-year recurrence-free survival rate in the training cohort with different risk stratifications. (B) Comparison of the 1-year recurrence-free survival rate in the validation cohort with different risk stratifications. (C) Kaplan–Meier survival curves for the three risk stratification groups in the training cohort. (D) Kaplan–Meier survival curves for the three risk stratification groups in the validation cohort. Risk stratification system: low risk, 0 to 16 points; medium risk, 17 to 29 points; high risk, 30 to 40 points.